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

Determination of the critical level of phosphorus in rapeseed dry land agriculture in the southeastern of Khuzestan

Ebrahim Fatahi Nejad1*, Ataallah Siadat2, Mehrdad Esfandiari1, Reza Moghadasi3 and Abdolamir Moezi4  
1Department of Soil Science, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran. 2Department of Agronomy, Ramin Agriculture and Natural Resource University, Molasani, Ahvaz, Iran. 3Department of Agricultural Economics Science, Faculty of Agriculture and Research Branch, Islamic Azad University (IAU), Tehran, Iran. 4Department of Soil Science, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran.
Email: [email protected]

  •  Accepted: 15 March 2012
  •  Published: 12 June 2012

Abstract

In order to determine the critical level of phosphorus using the kate – Nelson method, economic outlook and the Mitcherlich equation in the rape dry farming of canola in Behbahan region, 16 experiments in four regions and each region in 4 experiments in four groups of soil, using phosphorus (less than 3 mg/kg, 3 to 6 mg/kg, 6 to 10 mg/kg and more, 10 mg/kg) in the form of randomized complete blocks design with four phosphate fertilizer treatments (0, 25, 50, 75 kg/h P2O5) from triple super phosphate source in four replications for two agricultural years (2008 to 2010) was implemented. In the experiment, Hyola 401 was used. The results showed that the critical level of soil phosphorus to Kate - Nelson, economic outlook and the equation Mitcherlich is respectively 7, 6, 9.4 mg/kg.

 

Key words: Kate-Nelsonl method, canola, the critical level, balanced fertilization.