African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6728

AJAR Articles

A review of geographic information systems and digital imaging in plant pathology application

October 2016

The increasing rate of disease incidence resulting from devastating effects of plant pathogens, limits crop productivity globally, thus affecting food security. The current global population growth with many mouths to feed is dependent on vibrant agricultural productivity. The effects of globalization, climate change, evolution of pathogens and vectors to mention a few, have combined to increase spread of invasive plant...

Author(s): A. B. Nwauzoma

Evaluation of the gross and net calorific value of residues of wood pine and araucaria from reforestation

October 2016

The objective of this study was to assess the energy value of waste timber in the form of sawdust. Two types of wood: Araucaria (Araucaria angustifolia) and Pinus were evaluated with no defined species (Pinus sp). The sawdust was collected from a timber that receives wood from reforestation of these species in Southwestern Paraná, Brazil. The material collected was evaluated with a calorimeter bomb to determine...

Author(s): Marta Juliana Schmatz, Jair Antonio Cruz Siqueira, Carlos Eduardo Camargo Nogueira, Samuel Nelson Melegari de Souza, Luciene Kazue Tokura and Kleberson Luis Menezes and Darlisson Bentes dos Santos

Rice development and water demand under drought stress imposed at distinct growth stages

October 2016

This study aimed to establish a comparison for theoretical water demand between rice plants grown under flooding and under different levels of water stress, imposed at distinct crop stages, in terms of plant morpho-physiology and phenology. The experiment was installed in a greenhouse, using complete randomized design and factorial scheme 3 × 4 + 1, with four replications. Factor...

Author(s): Germani Concenço, José Maria Barbat Parfitt, Kelly Downing, Jacob Larue and Jaqueline Trombetta da Silva

Effects of rhizobacteria on Meloidogyne javanica infection on eggplants

October 2016

The effect of two rhizobacteria, Pantoea agglomerans and Bacillus subtilis on parasitism of the root-knot nematodes, Meloidogyne javanica on eggplants was evaluated in laboratory and greenhouse experiments. The impacts of the bacteria application as seed treatment, root dipping, and soil drench on early nematode penetration into plant roots, as well as, on eggplant growth were tested. The number of penetrated second...

Author(s): Melika Mohamedova, Donka Draganova, Iliyana Valcheva and Mladen Naydenov

Factors influencing smallholder crop commercialisation: Evidence from Côte d’Ivoire

October 2016

In this study, we analysed factors that influence crop output commercialisation among smallholder farmers in Cote d’Ivoire. Unlike previous studies, we correct for sample selection bias by using the Heckman maximum likelihood sample selection model with village fixed effects. We rely on a unique and detailed dataset that covers 3,393 smallholder farmers. The dataset was gathered from the 2014 National employment...

Author(s): Kotchikpa Gabriel Lawin and Wendkouni Jean-Baptiste Zongo

Multiple uses of forest resources in small and medium farms in the tropics: Economic and social contributions

October 2016

In complex systems, small anthropogenic changes of the initial conditions could lead to profound changes in the entire system. In this sense, the present literature review has surveyed several studies related to the multiple uses of forest resources and sustainability in small and medium-sized farms in the tropics. In 1985, Food and Agriculture Organization of the United Nations (FAO) published a work addressing...

Author(s): Benedito Albuquerque da Silva, Nidia Martineia Guerra Gomes, Leandro Skowronski, Michel Angelo Constantino de Oliveira and Reginaldo Brito da Costa

Shape and size relationships of Araucaria angustifolia in South Brazil

October 2016

Studies on morphology and occupancy area of trees provide knowledge on features and functions of forest ecosystem, especially in terms of competition and growth of trees. The main purpose of this work was to develop models for shape and size relationships of Araucaria angustifolia in natural forest remains of species. Dendrometric and morphometric variables from 210 trees from three sites were used. Results showed that...

Author(s): Myrcia Minatti, André Felipe Hess, Pollyni Ricken, Tascilla Magalhães Loiola and Isadora Arruda de Souza

Characterizing commercial cattle farms in Namibia: Risk, management, and sustainability

October 2016

Commercial cattle farming in semi-arid regions is subject to high rainfall risk. At the same time, it is prone to rangeland degradation. Theoretical works suggest that rainfall risk management by means of financial instruments may stabilize farming-derived income over the short-term, but provides little incentives for conservative rangeland management. Thus, the use of financial strategies of income stabilization may...

Author(s): Roland Olbrich, Martin F. Quaas and Stefan Baumgärtner,

Water content and soil nutrient in consortium of native fruit trees with cover crops

October 2016

The use of cover crops in intercropping is an important strategy for soil management and conservation, the improvement of edaphic conditions, and the optimization of cultivation of intercropped plants of commercial interest. The goal of the present study was to evaluate the water content and soil nutrient as well as initial growth of some fruit trees native to the Cerrado, Brazil. That is, Eugenia dysenterica Mart. ex...

Author(s): Paulo Dornelles, Adriano Perin, Fabiano Guimarães Silva, Aurélio Rubio Neto and Gabriel Bressiani Melo

Water use efficiency and growth variables of Operculina macrocarpa L. Urban grown in tropical environment

October 2016

Most of the population in developing countries still uses medicinal plants as the main source to meet their medical needs. Field experiments were carried out at tropical environment in Brazil in order to determine the main characteristics of ‘batata-de-purga’ (Operculina macrocarpa L. Urban), cultivated under 5 different levels of irrigation. The crop was cultivated with and without shading, using a plastic...

Author(s): Vicente de Paulo R. da Silva, Ricardo Pereira Veras, José Dantas Neto, Célia Campos Braga, Romildo Morant de Holanda and João Hugo Baracuy da Cunha Campos

Vermicompost of tannery sludge and sewage as conditioners soil with grown tomato#

October 2016

The objective was to evaluate the effect of tannery sludge vermicompost in the chemical properties of soil cultivated with tomato and irrigated with wastewater. The experimental design was completely randomized in a factorial 6 × 2, totaling twelve treatments with three replications. The treatments were: four tannery sludge vermicompost (25% Sludge tannery(LC) + manure - T1, 25% Sludge tannery(LC) + rice husk -...

Author(s): Cunha, A. H. N., Brasil, E. P. F., Ferreira, R. B., Vieira, J. A., Araújo, C. S. T., Silva, S. M. C.

Gas exchange in castor bean cultivars in response to foliar application of potassium silicate

October 2016

Since silicon and potassium are nutrients that influence plant physiological and biochemical aspects, the combined use of these minerals in the fertilization of cultivated plants has been increasingly investigated. This study aimed to evaluate the gas exchanges (Net photosynthesis, Stomatal conductance, Transpiration, Water use efficiency, Carboxylation efficiency, Internal carbon concentration, Chlorophyll a, b, total,...

Author(s): Jussara Cristina Firmino da Costa, Genelicio Souza Carvalho Júnior, Rosiane de Lourdes Silva de Lima, Hans Raj Gheyi, Valdinei Sofiatti and Maria Roselita André Soares

Effect of gypsum application on agro-energy performance of sugarcane varieties cultivated in a semi-arid environment

October 2016

Brazilian semi-arid soils can be dystrophic and often occur in areas with high agricultural potential. Gypsum application improves chemical and physical soil conditions, favoring root system development of plants and can improve sugarcane production for energy production, as a strategy for sustainable development, avoiding native vegetation destruction in semi-arid regions. This study aimed to analyze the impact of...

Author(s): Henrique Soares de Albuquerque, Alexandre Tavares da Rocha, Tiago Barreto Garcez, Renato Lemos dos Santos, Emídio Cantídio Almeida de Oliveira and Fernando José Freire

Productivity and physical properties of corn grains treated with different gypsum doses

October 2016

The productivity of corn grains is directly associated with factors related to soil fertility, which are relevant to the application of gypsum (calcium sulphate), in addition to variables inherent to the grain. Thus, the objective of this study was to evaluate the variability of the physical properties of grains (circularity, roundness, bulk density, real density, volume and porosity) and production components...

Author(s): Vitor Marques Vidal, Frederico Antonio Loureiro Soares, Marconi Batista Teixeira, Fernando Nobre Cunha, Wilker Alves Morais, Nelmício Furtado da Silva, Cícero Teixeira Silva Costa, Giovani Santos Moraes, Janniny Alves Cabral and Flávio Henrique Ferreira Gomes

Effects of drought on yield and yield components of two contrasting growth habits of common beans (Phaseolus vulgaris L.)

October 2016

Common bean is grown by smallholder farmers in Malawi who produce low yield due to drought constrains. Two experiments comprising of two different bean growth habits (IIa and IVa) were conducted at Chitedze Research Station in Malawi, to assess eleven common bean genotypes for yield and yield components under drought conditions. Drought reduced significantly number of pods plant-1, number of seeds pod-1 and consequently...

Author(s): Chantiro, S. J, Bokosi, J. M., Chirwa, R. M. and Mkwaila, E. W.

Forage yield and nutritive value of naturally growing Brachiaria decumbens as undergrowth to an aroeira tree stand in a silvopasture system

October 2016

This study evaluated the forage yield and feed chemical composition of a Brachiaria decumbens natural pasture as undergrowth to a Myracrodruon urundeuva (aroeira) tree stand in a silvopasture system at  UNESP/Ilha Solteira, Selvíria, Mato Grosso do Sul, Brazil. Sampling was conducted in a completely randomized block design with a factorial scheme of two plots and two sub-plots, with plots as the light...

Author(s): Carla Renata Silva Baleroni Guerra, Mario Luiz Teixeira de Moraes, Camila Regina Silva Baleroni Recco, Cristina Lacerda Soares Petrarolha Silva and Flavia Maria de Andrade Gimenes

Physical properties of a latosol eutrophic red under management systems after different winter crops successful by the soybean crop

October 2016

The objective was to verify the influence of winter crops under management mechanical (roller knife) and chemical (glyphosate), on soil physical properties and yield of soybeans. The experiment was carried out at the field under randomized block design in tracks scheme. The treatments consisted of four different winter crops (oats IPR 126, wheat BRS Tarumãt crambe FMS Bright and forage radish cultivar common) in...

Author(s): Poliana Ferreira Da Costa, Paulo Sérgio Rabello De Oliveira, Jeferson Tiago Piano, Loreno Egidio Taffarel, Milciades Ariel Melgarejo Arrúa, Marcos Vinícius Mansano Sarto and Shaline Séfara Lopes Fernandes

Determination of parameters for selection of Eucalyptus clones tolerant to drought

October 2016

Climatic changes have induced the spread of aridity in many parts of the globe. Eucalyptus plantations show wide variations in productivity due to several factors, including climatic changes. Therefore, Eucalyptus genotypes that can adapt to such conditions is very welcome. Thus, an evaluation was done by comparing the physiological responses of two Eucalyptus genotypes, tolerant and drought-sensitive. They were...

Author(s): Inaê Mariê de Araújo Silva, Michael Willian Rocha de Souza, Any Caroliny Pinto Rodrigues, Luiz Paulo de Sousa Correia, Ronnie Von dos Santos Veloso, José Barbosa dos Santos, Miranda Titon, Janaína Fernandes Gonçalves and Marcelo Luiz de Laia

An optimization model for the combined planning and harvesting of sugarcane with maturity considerations

October 2016

Planting and harvesting are important stages in the sugarcane crop cycle, because well planned planting and harvesting phases promote a series of benefits throughout the cultivation cycle and in the subsequent industrial use of the products. These benefits are operational, economic and environmental such as: improved utilization of the land area and transport logistics; an increase in sugarcane output; better cane...

Author(s): Rômulo Pimentel Ramos, Paulo Roberto Isler, Helenice de Oliveira Florentino, Dylan Jones and Jonis Jecks Nervis

Effects of agricultural spray adjuvants in surface tension reduction and spray retention on Eucalyptus leaves

October 2016

Agricultural spray adjuvants (ASA) are widely used in pesticide applications to enhance the effective control of pest, weed and disease. The aim of this research was to investigate the effects of ASA used in Brazil agriculture on surface tension reducing capacity and foliar spray retention on different Eucalyptus species. Static surface tension of adjuvants at concentrations of 0.001, 0.0025, 0.005, 0.01, 0.025, 0.05,...

Author(s): Evandro Pereira Prado, Carlos Gilberto Raetano, Mario Henrique Ferreira do Amaral Dal Pogetto, Rodolfo Glauber Chechetto, Pedro José Ferreira Filho, Anderson Chagas Magalhães and Celso Tadao Miasaki

Systems of land use affecting nodulation and growth of tree legumes in different soils of the Brazilian semiarid area

October 2016

The growth of tree legumes in degraded areas must be preceded by assessments of nodulation ability of naturally established rhizobia populations since such information contributes to defining the species which can be planted for recovering disturbed areas. The aim of this study was to evaluate the growth and natural nodulation of “sabiá” (Mimosa caesalpiniifolia Benth.) and leucaena (Leucaena...

Author(s): Vinicius Santos Gomes da Silva, Carolina Etienne de Rosália e Silva Santos, Ana Dolores Santiago de Freitas, Newton Pereira Stamford, Aleksandro Ferreira da Silva and  Maria do Carmo Catanho Pereira de Lyra

Simulation of oat grain (Avena sativa) using its panicle components and nitrogen fertilizer

October 2016

Nitrogen fertilizer management modifies oat (Avena sativa) panicle components and its grain yield. The work aims to study the potential of the variables of oat (A. sativa) panicle with N-fertilizer, and to simulatate its grain yield using multiple linear regression in succession systems of high and reduced N-residual release. The study was done in 2013 and 2014. The experiment was done in a complete randomized block of...

Author(s): Rubia Diana Mantai, José Antonio Gonzalez da Silva, Emilio Ghisleni Arenhardt, Osmar Bruneslau Scremin, Ângela Teresinha Woschinski de Mamann, Rafael Zancan Frantz, Antonio Carlos Valdiero, Rafael Pretto and Dionatan Ketzer Krysczun

Growth and composition of sugarcane and chemical attributes of the soil by fertilizing with different levels of cow manure

October 2016

Four months after planting sugarcane variety RB867515, fertilized with 0.0, 4.5, 9.0, 13.5 and 18.0 Mg ha-1 of cow manure, there was positive linear effect of the fertilizer on plant height and stalk diameter, quadratic positive effect on width and length of the largest leaf, and no effect on number of plants m-1 linear and the number of leaves plant-1. At 10 months, there was quadratic positive effect of cow manure on...

Author(s): Geicimara Guimarães, Rogério de Paula Lana, Rosane Cláudia Rodrigues, Cristina Mattos Veloso, Renata de Souza Reis, Maria Regina de Miranda Souza and Silvane de Almeida Campos

Losses of pesticides in runoff from cotton crops under different management systems

October 2016

In this study the concentrations of the atrazine, desethylatrazine (DEA), desisopropylatrazine (DIA), azoxistrobin, carbendazim, carbofuran, chlorpyrifos, diuron, endosulfan alpha and beta endosulfan sulfate, malathion, metolachlor, methomyl, monocrotofos, permethrin, profenofos, teflubenzuron, thiacloprid, tiametoxan and triflumuron were assessed in runoff water from cotton plantations under different management...

Author(s): Isaltino A. Barbosa, Ricardo S. S. Amorim and Eliana F. G. C. Dores

The influence of cover crops on erva de touro (Tridax procumbens)

October 2016

Tridax procumbens is an herbaceous plant belonging to the Asteraceæ family and popularly known as erva-de-touro or margaridinha. The objective of this study is to investigate the effects of cover crops when incorporated or maintained on the soil surface at different levels of straw, on the emergence and initial development of erva de touro. The experiment was conducted in a greenhouse during the period of May to...

Author(s): João Batista da Silva Oliveira, Adaniel Sousa dos Santos, Wéverson Lima Fonseca, Tiago de Oliveira Sousa, Leandro Pereira Pacheco, Aline Sousa dos Santos, Lisânia de Castro Medeiros and Alan Mario Zuffo

Influence of Ilex paraguariensis aqueous extract on safflower growth and germination in vitro

October 2016

Allelopathy is a natural botanical effect in which certain crops release inhibitory substances which affect growth and development of other crops to the environment. The ability of plants to exhibit allelopathy vary among species. In Brazil, the allelopathic studies are restricted to common plants, such as corn, soy, wheat, and safflower. Given these factors, there are still many cultures as Ilex paraguariensis that are...

Author(s): Rodrigo Techio Bressan, Renathielly Fernanda da Silva, Maurício Antônio Pilatti, Fernando Muller, Lucas da Silveira, Joice dos Reis da Silva, Reginaldo Ferreira Santos and Cristiano Fernando Lewandoski

Effects of pre-germination treatments on Copaifera langsdorffii seeds

October 2016

Copaifera langsdorffii has been intensely exploited, since it attracts several interests, and is now on the list of endangered species. Due to this risk of extinction, seedling production of this species has important economic and social value. The aim of this study was to evaluate seed germination of C. langsdorffii subjected to different pre-germination treatments for breaking seeddormancy: i) control; ii) immersion...

Author(s): Camila Andrade Silva, Alexsandro Lara Teixeira, Rosa Luxemburgo Albuquerque Gomes, Fábio Renato Oliveira Marques, Aline Aparecida Smychniuk da Silva and Ana Carolina Andrade Silva

Residual effect of herbicides 2,4-D and Glyphosate on soybeans in a Brazilian Cerrado Ultisol

October 2016

The use of herbicides for weed desiccation is what enables the no-tillage system, which increasingly stimulates the growth of the agrochemical market, in particular the class of herbicides. This study aimed to assess 2,4-dichlorophenoxyacetic acid and Glyphosate (N-phosphonomethyl-glycine) herbicides mixture persistence in soybeans of Ultisol in the Brazilian Cerrado. The study was conducted in a greenhouse with a...

Author(s): Maria Aparecida Peres-Oliveira, Edna Maria Bonfim-Silva, Geovana Estevan de Sousa, Vinicius Melo da Silva and Elizete Cavalcante De Souza Vieira

Agro-morphological diversity within field pea (Pisum sativum L.) genotypes

October 2016

The objective of this study was to analyze the genetic diversity present in twelve Algerian pea genotypes using 24 agro-morphological traits. The experiment was carried out during three growing seasons (2013 to 2014, 2014 to 2015 and 2015 to 2016). ANOVA analysis revealed the presence of a great genetic variability for all characters studied. This diversity might be used in breeding programs. Also, expression of...

Author(s): Leila Ouafi, Farida Alane, Hafida Rahal-Bouziane and Aissa Abdelguerfi

Effect of type of fuel and speed of engine on the performance of agricultural tractor

October 2016

Given the need for new alternatives to finite source of energy from fossil fuels, testing of alternative fuels has become quite important. Studies have been carried out using sets of tractor with equipment to evaluate the operational performance together with supplying diesel and biodiesel. Biodiesel is a feasible alternative as it waives adjustments in diesel cycle engines, unlike other clean fuels such as natural gas...

Author(s): Melina Cais Jejcic de Oliveira , Afonso Lopes, Leomar Paulo de Lima, Murilo Coelho Theodoro Neves, Priscila Sawasaki Iamaguti, Thyago Augusto Medeiros Lira, Thaisa Calvo Fugineri Moreti, Gilberto Hirotsugu Azevedo Koike, Ariston Pinto Santos and  Rogério de Abreu Silva

Smoke opacity of ethyl biodiesel from babassu and two types of diesel at different daytimes

October 2016

Renewable energy benefits and disadvantages have been subject of major discussions and studies. Thus, this study aimed at assessing the smoke opacity from a farming tractor running two types of diesel, B S1800 (B0) and B S10 (B0), and ethyl biodiesel from babassu oil at two rates (B50 and B100), at six day periods (2, 6, 10 am, 2, 6 and 10 pm). The study was conducted at the Department of Agricultural Engineering of the...

Author(s): Thyago Augusto Medeiros Lira, Thaisa Calvo Fugineri Moreti, Afonso Lopes, Ariston Pinto Santos, Melina Cais Jejcic de Oliveira, Murilo Coelho Theodoro Neves, Priscila Sawasaki Iamaguti, Leomar Paulo de Lima, Gilberto Hirotsugu Azevedo Koike and  Rogério de Abreu Silva

Occurrence of Cucumber mosaic virus, Zucchini yellow mosaic virus and Watermelon mosaic virus in cultivated and wild cucurbits in the coastal areas of Tanzania

October 2016

Cucurbit vegetables play important role as sources of vitamins, micronutrients and income. However, their production is constrained, inter alia, by the virus diseases. Cucumber mosaic virus (CMV; Cucumovirus), Zucchini yellow mosaic virus (ZYMV; Potyvirus) and Watermelon mosaic virus (WMV; Potyvirus) are the major causal agents of devastating virus diseases of the cucurbits. Disease symptoms similar to those caused by...

Author(s): Maria Sydänmetsä and Deusdedith R. Mbanzibwa

Growth analysis, nitrogen accumulation, and yield of sugarcane varieties for the pre-amazon region of Brazil

October 2016

The great expansion of sugar cane production to non-traditional regions in Brazil has demonstrated the importance of knowledge on the growth characteristics to maintain the productivity and sustainability of the sector. Among the alternatives available to evaluate different varieties of sugar cane, the growth analysis has been one of the most used tools. The objective of this study was to evaluate the growth and...

Author(s): Francirose Shigaki, Thiago Pontes Lira, José Roberto Brito Freitas, Mayanna Karlla Lima Costa,  Ludhanna Marinho Veras, Rosane Cláudia Rodrigues and Elisangela Sousa de Araújo

Association of on-farm feeds handling practices with fungal growth and Mycotoxin production on feeds in smallholder dairy farms, Nakuru, Kenya

September 2016

Practices used by smallholder dairy farmers for handling of feeds at the farm pose a risk of mycotoxins to dairy animals and dairy products, hence a public health concern. The aim of the study was to document the on-farm practices of handling feeds used by these farmers and how they influence the growth of mycotoxin producing fungi together with prevailing extrinsic conditions. Study involved the use of structured...

Author(s): Makau Caroline Mwende, Matofari Joseph Wafula, Muliro Patrick Simiyu and Bebe Bockline Omedo

Effects of potassium fertilization and commercial substrates on development of passion fruit seedlings under greenhouse condition

September 2016

The aim of this work was to evaluate commercially available substrates and levels of potassium on the development of passion fruit seedlings in protected conditions. The experiment was conducted at the city of Presidente Prudente, São Paulo within the period from April to September of 2010. The treatments were made with three different substrates (Bioplant®, Coconut fiber and Vivatto®) and four levels of...

Author(s): Rodrigo Takashi Maruki Miyake, William Hiroshi Suekane Takata, Wellington Eduardo Xavier Guerra, Fernanda Forli, Nobuyoshi Narita and José Eduardo Creste

Tolerance of coriander cultivars under saline stress

September 2016

This study aimed to evaluate the emergence, growth and phytomass accumulation of coriander cultivars under saline stress. The experiment was carried out from August to September 2014, in a protected environment (greenhouse), at the Center of Sciences and Food Technology - CCTA of the Federal University of Campina Grande – UFCG, located in the municipality of Pombal-PB, Brazil (6°47’20’’ S;...

Author(s): Francisco Vanies da Silva Sá, Lauter Silva Souto, Emanoela Pereira de Paiva, Miguel Ferreira Neto, Rosilene Agra da Silva, Maria Kaline do Nascimento Silva, Evandro Franklin de Mesquita, Fernandes Antônio de Almeida and Antônio Alves Neto

The Assistat Software Version 7.7 and its use in the analysis of experimental data

September 2016

Statistical programs are essential tools for those who deal with scientific research and need to analyze experimental data. In agriculture, there are often uncontrolled factors, which determine the necessity of statistical analyses of the data. The Assistat software version 7.7 is one of these tools and this study aimed to demonstrate its functionality and efficiency in the analyses of experimental data of agricultural...

Author(s): Francisco de Assis Santos e Silva and Carlos Alberto Vieira de Azevedo

Measurement of apparent electrical conductivity of soil and the spatial variability of soil chemical properties by electromagnetic induction

September 2016

The aim of this research is to evaluate the relationship between the measurement of apparent electrical conductivity of soil and its chemical attributes by electromagnetic induction. Geophysics methods used for soil measurement, with electromagnetic induction technique for measuring apparent electrical conductivity of the soil (ECa) is important for soil digital mapping, as it determines soil properties, with which ECa...

Author(s): Glécio Machado Siqueira, Jorge Dafonte Dafonte, Antonio Paz González, Monteserrat Valcarcel Armesto, Ênio Farias de França e Silva, Mayanna Karlla Lima Costa and Raimunda Alves Silva

Characterization of water-stress tolerant cotton cultivars based on plant growth and in activity of antioxidant enzymes

September 2016

The aim of this study was to characterize cotton cultivars based on growth data and on antioxidant enzymes activity, in order to identify better-adapted cultivars to water-stress conditions. Nine genotypes were submitted to 7 days of water suppression starting at 45 days after seedling emergence (phase R1). The essay was carried out in greenhouse conditions, where plants were grown in 5 L vases filled with sandy soil...

Author(s): Jessica Damasceno Rodrigues, Carliane Rebeca Coelho da Silva, Rennan Fernandes Pereira, Jean Pierre Cordeiro Ramos, Péricles de Albuquerque Melo Filho, José Jaime Vasconcelos Cavalcanti and Roseane Cavalcanti Santos

Selection of input vectors for estimation of aboveground biomass of Mimosa scabrella Benth. using an artificial neural network

September 2016

The objective of this study was to evaluate the effect of input vectors in an artificial neural network (ANN) and determine their best combination to estimate the individual dry biomass of native bracatinga. The dataset consisted of 178 trees of Mimosa scabrella Benth. (bracatinga) from the Metropolitan Region of Curitiba. The ANN used was a Multi-Layer Perceptron; the learning algorithm was the Levenberg-Marquardt,...

Author(s): Aline Bernarda Debastiani, Ana Paula Marques Martins, Carlos Roberto Sanquetta, Sebastião do Amaral Machado, Ana Paula Dalla Corte, and Edilson Urbano

Guava rootstocks growth under incorporation of cattle manure and application of organic fertilizer the base of fruit of peel

September 2016

The use of rootstocks in fruit production is extremely important, as well as reducing juvenility also enables faster production. In this context, the objective was to evaluate the effect of different rates of manure and application of organic fertilizer on the growth of guava rootstocks. The experiment was conducted in the greenhouse of the State University of Paraíba (UEPB) in municipality of Catolé do...

Author(s): Mario Leno Martins Véras, José Sebastião de Melo Filho, Lunara de Sousa Alves,  Toni Halan da Silva Irineu, Nelto Almeida Sousa, Lucimara Ferreira de Figueiredo, Edinete Nunes de Melo, Leandra de Melo Cavalcante, Thiago Jardelino Dias and Alvaro Carlos Gonçalves Neto

Diversity, abundance and incidence of fruit pest insects on three Solanum varieties (Solanaceae) in two agro-ecological zones of Southern Cameroon

September 2016

Various species and varieties of the genus Solanum (Solanaceae) are among the most important market crops produced worldwide. They may be considered as multipurpose crops since leaves and/or fruits are eaten fresh or cooked in various dishes. The increase of garden surfaces and the permanence of gardening have induced frequent outbreaks and diversification of pests and cryptogrammic diseases. In order to improve...

Author(s): Elono Azang Pierre Stephan, Aléné Désirée Chantal, Heumou Cyril Roméo, Ngassam Pierre and Djiéto-Lordon Champlain

Yield response of canola (Brassica napus L.) to different inter-row spacings and sowing dates in northwest of Paraná, Brazil

September 2016

In Brazil, the cultivation of canola has increased as a result of higher demand for biodiesel production. However, the current knowledge on planting arrangement and sowing time to boost the crop’s yield in the southern part of the country is limited. On this point, the goal of this work was to evaluate the yield potential of four canola hybrids submitted to different sowing dates and inter-row spacings...

Author(s): Lucas Caiubi Pereira, Gabriel Loli Bazo, Alessandro Lucca Braccini, Luiz Henrique da Silva Lima, Mayara Mariana Garcia and Keila Regina Hossa

Root system distribution and vegetative characteristics of Prata type bananas under different irrigation strategies

September 2016

This study aimed to analyze the root system distribution and vegetative characteristics (pseudo-stem perimeter, plant height, number of leaves and the leaf area) in ‘Dwarf-Prata’ and ‘BRS-Platina’ in their third production cycles under different five irrigation strategies. The vegetative characteristics were measured at the flowering stage and the root sampling was done after the harvesting in...

Author(s): Marcelo Rocha dos Santos, Lilian Leal Lourenço, Sérgio Luiz Rodrigues Donato, Bismarc Lopes da Silva, Igor Nogueira de Castro and Maurício Antônio Coelho Filho

Stability of soil aggregates in Latosols and Cambisols via standard method and sonification

September 2016

The results of determining the stability of aggregates in water are sometimes contrasting, and do not permit a definition of the energy level or force involved in this analysis. The objective of this study was to compare two methods to determine the geometric mean diameter (GMD) and the percentage of aggregates > 2 mm in Latosol and Cambisol submitted to management under coffee. To conduct this study we collected...

Author(s): Érika Andressa da Silva, Geraldo César de Oliveira, Carla Eloize Carducci, José Maria de Lima, Laura Beatriz Batista de Melo and Pedro Antônio Namorato Benevenute

Contribution of soybean seed treatment with Fluquinconazole to manage yield losses caused by Phakospora pachyrhizi using meta-analysis

September 2016

The reduction in efficiency of triazole and strobilurin fungicides sprayed on soybean crops has stimulated investigations into alternative ways of controlling Asian rust (Phakopsora pachyrhizi). Treating seeds with fluquinconazole may provide additional benefits in terms of disease management. Results obtained through research are inconclusive, however, with studies presenting both positive and negative outcomes. In...

Author(s): Lucas H. Fantin, Marcelo G. Canteri, André L. da Silva, Fernando L. Buss Tupich and Laurence V. Madden

Enhancing the productivity of groundnut (Arachis hypogaea) through earthening up practices at Tanqua-Abergelle district, Central Tigray, Ethiopia

September 2016

Groundnut, an important crop provides significant sources of cash, oil and an important role in diets but the yield is low due to different constraints like earthening up. In this regard, this study was carried out to improve yields by identifying the best stages of earthening up practices. The experiment was conducted at Abergelle Agricultural Research Centre testing site in 2010/2011 and 2011/2012 cropping seasons....

Author(s): Berhane Sibhatu, Hintsa Meresa, Guesh Tekle and Melese Harf

Fungitoxicity activity of homeopathic medicines on Alternaria solani

September 2016

The black spot disease caused by the fungus Alternaria solani (Ellis and Martin) L. R. Jones and Gront is one of the most important diseases of tomato (Lycopersicon esculentum Mill.). The control is usually performed with fungicides, resulting in products contaminated with pesticide residues. In recent years, the use of homeopathic medicines has been highlighted in research for disease control. The aim of this study was...

Author(s): Márcia Vargas Toledo, José Renato Stangarlin, Carlos Moacir Bonato, Thaísa Muriel Mioranza, Mônica Anghinoni Müller, Bruna Broti Rissato, Eloisa Lorenzetti, Sidiane Coltro-Roncato, Carla Rosane Kosmann and Lindomar Assi

Chemical ripeners and different harvest periods in sugarcane in State of Paraná, southern Brazil

September 2016

The objective of this work was to evaluate the effects of control action (natural ripening, without ripeners) and of glyphosate, paraquat, fluazi-p-butil, ethephon, etyl-trinexapac, sulfometuron methyl and KNO3 on the number of stalks per area, diameter of the median third of stalks and productivity (tons of canesstalks per hectare), and brix, pol of the sugarcane and extractable sugar. It was used a randomized block...

Author(s): Paulo Barbosa de Oliveira Filho,, José Barbosa Duarte Júnior, Antônio Carlos Torres da Costa, Paulo Sérgio Rabello de Oliveira, Eurides Kuster Macedo Júnior, Vandeir Francisco Guimarães and Willian Bosquette

Evaluation of mineral composition of endogenous and improved varieties of maize (Zea mays) cultivated in Southern Benin

September 2016

This study aims to establish the mineral potential of 30 varieties of corn mainly used in the traditional and industrial processing sectors. The samples were collected from all agro-ecological zones of corn production in southern Benin. The nutritional profile of samples was evaluated through their mineral composition using AOAC methods. The results of cluster analysis revealed that the samples analysed were ranked in...

Author(s): A. J. Semassa, V. B. Anihouvi, S. W. Padonou, D. Aly, A. Adjanohoun and L. Baba-Moussa

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