Determination of the Critical Level and Development of Phosphorus Fertilizer According to the Soil Test in the Rape Dry Farming of Canola (Brassica napus L)

For determining the critical level and development of phosphorus fertilizer required for canola “Brassica napus L” Hayola 401 figure based on the soil test in the dry framing 16 tests in four places and in each place four tests in four groups of phosphorus usable in the soil (less than 3 ppm, 3-6 ppm, 6- 10 ppm, and more than 10 ppm)p in the form of Randomized complete blocks design with four For two agricultural years, phosphorus fertilizer treatments (0, 25, 50, 75 kilograms of P2O5 per acre) from triple super phosphate sources were used in four repetitions (2008-2010). According to the findings, the critical level of soil phosphorus for Kate – Nelson, the economic outlook, and the Mitcherlich equation is 7, 6, 9 / 4 ppm. The fertility index degrees in soil phosphorous groups were determined to be (less than 3 ppm, 3-5 ppm, 5-7 ppm, and more than 7 ppm) respectively (60, 44, 25, 0 kgs P2O5 in acres).

Author (S) Details

Dr. Ebrahim. Fatahi Nejad
Department of Soil Sciences, Behbahan Branch, Islamic Azad University, Behbahan, Iran.

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