Abstract

Shahram G. Hatima

For development of phosphorus fertilizer needed for canola “Brassica naplusl” Hayola 401 figure according to the soil test in the dry framing 16 tests in four places and in each place 4 tests in 4 groups of phosphorus useable in the soil (less than 3 ppm, 3-6 ppm, 6-10 ppm and more than 10 ppm) in the form of randomized complete blocks design with 4 phosphorus fertilizer treatments (0, 25, 50 and 75 kg of P2 O5 in each acre) triple super phosphate sources were used in 4 repetition for 2 agricultural years (2008 to 2010). The results obtained show that the fertility index degrees in phosphorous groups used in the soil have been determined as (less than 3 ppm, 3-5 ppm, 5-7 ppm and more than 7 ppm) respectively (60, 44, 25 and 0 kg P2 O5 in acres).