The role of organic materials and partial acidulation in improving effectiveness of phosphate rock in gypsiferous soils

M. Muhawish  And  E. E. Mohammed, N.

	The role of organic materials and partial acidulation in improving effectiveness of phosphate rock in gypsiferous soils
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 12, Issue 3, 2012, Pages 163-171
Author
N. M. Muhawish and E. E. Mohammed
Abstract
A pot experiment was conducted to determine the role of organic materials (plant & animal) applied with phpsphate rock (PR) and partial acidulation of PR (through mixing with water soluble phosphate fertilizer{TSP} in different ratios 50:50 and 60:40 TSP:PR in PR effectiveness (dry weight, P uptake, and available NaHCO3 extractable P). Wheat (Triticum aestivum )was used as a test crop in two gypsiferous soils(Tikrit and Dour). Results showed that the two treatments ( TSP50+PR50) and (TSP60+PR40) did not differ significantly (p<0.05) with TSP in plant weight, P conc. in plant and NaHCO3 extractable P (Olsen P). The treatment TSP60+PR40 was superior above TSP in plant height and P conc. in plant. Treatments of partial acidulation did not differ significantly in most of the studied characters. Organic materials treatments did not differ significantly in plant height, P conc. in plant and available P. The two soils did not differ significantly in plant height and available P in soil, while Tikrit soil was superior in dry weight, P conc. in plant and P uptake. The higher value for interaction in Tikrit soil for plant height character was for the treatment TSP60+PR40 which did not differ significantly with TSP and TSP50+PR50, while for dry weight character, P conc. in plant and available P the interaction treatment for Tikrit soil with TSP was superior but did not differ significantly with TSP60+PR40 and TSP50+PR50. The highest value for interaction for the two soils was TSP60+PR40 in Dour soil for plant height and available P in soil P. The performance of organic treatments did not differ for the interaction treatments significantly with partial acidulation treatments especially TSP50+PR50 for all of the studied characters. Phosphate rock alone gave the lowest values for all of the characters although it did not differ significantly with organic treatments or TSP50+PR50. We conclude from these results that we can compensate for 40 – 50 % of TSP applied to gypsiferous soils by application of PR, or application of PR plus organic wastes especially animal wastes.
Keywords
Organic; Partial; gypsiferous

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