Agronomic Effectiveness of a New Formula of Phosphate FertilizerII – Residual Agronomic Effectiveness

	Agronomic Effectiveness of a New Formula of Phosphate FertilizerII – Residual Agronomic Effectiveness
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 9, Issue 2, 2009, Pages 226-635
Abstract
A field experiment was conducted using wheat ( Triticum aestivum var. Tamouz /2) as a test crop to evaluate the residual effect of heavy single application of three sources of P fertilizers viz: TSP, PR and M5 ( a new formula consisted of PR + elemental sulphur of which 20% of S was added as H2SO4 ) which applied once in the first year at four rates ( 0, 86, 172, and 344 kg P.ha-1) on wheat grain yield and P uptake. Results showed that a maximum grain yield was achieved by M5 and there was a significant increase caused by M5 and PR over TSP. Increasing P rate increased grain yield but it did not reach the maximum at the highest rate of application. The second rate of M5 gave a grain yield which was near the grain yield obtained by the fourth rate of PR and the third rate of TSP. The increase in wheat straw yield using M5 was significant (p=0.05) compared with PR and TSP. The fourth rate of P differed significantly with the first and second rate concerning wheat straw yield. The increase in P uptake was significant in the case of M5 compared with TSP and PR. The same trend was observed in the effect of P rate on P uptake as for wheat straw yield. NaHCO3 extractable P (Olsen P) followed the order: TSP Keywords

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