African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Soil evaporation under different straw mulch fractions

Paulo Sérgio Lourenço de Freitas
  • Paulo Sérgio Lourenço de Freitas
  • Department of Agronomy, State University of Maringa-UEM, Brazil.
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Ricardo Gava
  • Ricardo Gava
  • Biosystems Engineering Department, University of São Paulo-USP/ESALQ, Piracicaba, Brazil.
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Rogério Teixeira de Faria
  • Rogério Teixeira de Faria
  • Faculty of Agricultural Sciences and Veterinary, UNESP/FCAV - Univ Estadual Paulista, Jaboticabal, Brazil.
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Roberto Rezende
  • Roberto Rezende
  • Department of Agronomy, State University of Maringa-UEM, Brazil.
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Paulo Vinicius Demeneck Vieira
  • Paulo Vinicius Demeneck Vieira
  • Department of Agronomy, State University of Maringa-UEM, Brazil.
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  •  Received: 27 August 2013
  •  Accepted: 14 May 2014
  •  Published: 10 June 2014

Abstract

This study was conducted at the Agronomic Institute of Parana (IAPAR), Londrina, Parana state (latitude 23° 18' S, longitude 51° 09' W, average elevation of 585 m). Londrina's climate in Köppen's classification is Cfa type, that is, humid subtropical climate with rain in all seasons and droughts in winter. Soil water evaporation (E) was determined for different soil mulching cover fractions. The treatments were applied on 2.66 m2 x 1.3 m deep weighing lysimeters for the determination of E by mass difference with an accuracy of 0.01 milimeter in 1 h intervals. Evaporation was determined for different mulching fractions using the average amount of wheat straw produced in that region of 5 ton.ha-1 distributed onto 25, 50, 75 and 100% of the soil surface. In the first cycle (28 October to  27 November, 2008), the reductions of E in treatments with 25, 50, 75 and 100% mulching cover in relation to the not-mulched soil were 15, 17, 20 and 30%, while in the second cycle (19 January  to 16 February, 2009), the reduction were 15, 30, 45 and 60%, respectively.

 

Key words: Wheat straw, mulching uniformity, soil water loss.