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EFFECT OF PHOSPHORUS SOURCE, LEVELS AND TIMING ON CONCENTRATIONS OF N, P AND K IN MAIZE GRAINS | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 39, Issue 6, 2008, Pages 11-20 | ||
| Authors | ||
| Hameed K. Al-Salmani; Ahmed N. Al-Mussawi | ||
| Abstract | ||
| A field experiment was conducted at a private farm in Abu-Ghraib region during the autumn season of 2003, to study the effect of four Phosphorus sources (Trisuper Phosphate (TSP), Mono Ammonium phosphate (MAP), Diammonium phosphate (DAP) and urea Phosphate Up applied in three levels (40, 80 and 120) kg P ha-1 on concentrations of N, P and K in corn grain, in addition to control treatment. Fertilizers were splitted and applied either all the amount at sawing time or by adding half of the amount at sowing and the other half at tussling stage. Randomized complete block design was used with three replications; 320 kg N.ha-1 of urea and 80 kg K. ha-1 of potassium sulfate were added to all treatments at maturity plants were harvested. Concentrations of N, P and K in grain were determined the results showed that all phosphorus sources, levels and time of applications significantly increased concentrations of N, P and K in grain (1.40%, 1.07% and 0.31%) respectively. The highest concentrations of N, P and K in grain were (1.68%, 1.20% and 0.36%) respectively. when 120 kg P.h-1 of urea phosphate added at two times. | ||
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