POTASSIUM FERTILIZER RECOMMENDATIONS THROUGH DETERMINATION OF MITSCHERLICH-BRAY EQUATION COEFFICIENTS FOR IRRIGATED WHEAT

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ABDOLLAHI ALI; MALAKOUTI MOHAMMAD JAFAR; GHADERI JALAL

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Journal: Iranian Journal of Soil and Water Research Year:2011 | Volume:42 | Issue:1 Page(s): 121-128

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Title

POTASSIUM FERTILIZER RECOMMENDATIONS THROUGH DETERMINATION OF MITSCHERLICH-BRAY EQUATION COEFFICIENTS FOR IRRIGATED WHEAT

Author(s)

ABDOLLAHI ALI | MALAKOUTI MOHAMMAD JAFAR | GHADERI JALAL | Issue Writer Certificate

Keywords

WHEAT (TRITICUM AESTIVUM L.)Q2

MITSCHERLICHQ2

BRAY EQUATIONQ2

FERTILIZER RECOMMENDATIONQ3

POTASSIUM CRITICAL LEVELQ3

Abstract

To determine the coefficients of c1 and c in MITSCHERLICH-Bray equation, critical level and FERTILIZER RECOMMENDATION for potassium (K) as by MITSCHERLICH-Bray (MB) equation, an experiment in a randomized complete block design of 5 treatments and 3 replications was carried out in 12 irrigated wheat (Triticum aestivum L.) fields in Sarpol-e-Zohab region during the 2007-08 growing season. The treatments included T1 = Farmer's conventional fertilization practice= NP); T2 = control (all the nutrients included except K); T3 = T2 + 100 kg ha-1 muriate of potash (MOP); T4 = T2 + 200 kg ha-1 MOP and T5 = T2 + 300 kg ha-1 MOP in three stages of: preplanting, tillering, and stalk bearing. Following harvest, grain yield was determined, and MB Equation's coefficients for K calculated. The value of c1 coefficient for the 11 wheat fields was found as 0.0020. POTASSIUM CRITICAL LEVEL was 115 mg kg-1 for 85% of the maximum yield under non-subsidized, i.e., free market fertilizer prices condition. However, under existing subsidized fertilizer prices, POTASSIUM CRITICAL LEVEL achieved for 95% of maximum yield was 180 mg kg-1. Therefore, based on the information obtained, the managers of soil test laboratories will have a suitable tool in predicting the farmers' relative yields and economic return on wheat with each incremental increase in K-fertilizer application just only by analyzing the available K in the soils. There is need for such information also for other regions and for other different field crops.

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APA: Copy

ABDOLLAHI, ALI, MALAKOUTI, MOHAMMAD JAFAR, & GHADERI, JALAL. (2011). POTASSIUM FERTILIZER RECOMMENDATIONS THROUGH DETERMINATION OF MITSCHERLICH-BRAY EQUATION COEFFICIENTS FOR IRRIGATED WHEAT. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 42(1), 121-128. SID. https://sid.ir/paper/225725/en

Vancouver: Copy

ABDOLLAHI ALI, MALAKOUTI MOHAMMAD JAFAR, GHADERI JALAL. POTASSIUM FERTILIZER RECOMMENDATIONS THROUGH DETERMINATION OF MITSCHERLICH-BRAY EQUATION COEFFICIENTS FOR IRRIGATED WHEAT. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2011;42(1):121-128. Available from: https://sid.ir/paper/225725/en

IEEE: Copy

ALI ABDOLLAHI, MOHAMMAD JAFAR MALAKOUTI, and JALAL GHADERI, “POTASSIUM FERTILIZER RECOMMENDATIONS THROUGH DETERMINATION OF MITSCHERLICH-BRAY EQUATION COEFFICIENTS FOR IRRIGATED WHEAT,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 42, no. 1, pp. 121–128, 2011, [Online]. Available: https://sid.ir/paper/225725/en

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