Abstract
Phosphorus (P) use efficiency is very low (5 to 25%) due to fixation with Ca+2/Mg+2 in alkaline/calcareous soils which decreases P availability for plant uptake. There is need to improve P availability for plant growth. For this purpose, coating of phosphatic fertilizer with the organic polymer may reduce P fixation and cause the steady release of P to increase its use efficiency. This study accesses enhanced phosphorus use efficiency along with improved growth of wheat at different rates of polymer coated di-ammonium phosphate (DAP) in comparison with uncoated DAP. In laboratory experiments, release pattern of P in soil from different coating concentrations (0, 0.5, 1.0, 1.5%) and number of coatings (uncoated, single, double, triple) were tested under controlled conditions. The best screened polymer concentration (1%) and coating layers (double coating) were tested under field conditions on wheat crop growth, yield and fertilizer efficiency. Results showed that application of 100% of recommended rate of P as polymer coated DAP increased plant height (4%), biological yield (39%), grain yield (29%), agronomic efficiency (58%), recovery efficiency (130%) and nitrogen, phosphorus and potassium contents of wheat grain and straw was also increased compared to uncoated DAP. These results revealed that polymer coated DAP can be proved more effective fertilizer to improve growth, yield and phosphorus use efficiency of the wheat crop over commercial DAP.

Sobia Noor, Muhammad Yaseen, Muhammad Naveed, Rashid Ahmad. (2018) USE OF CONTROLLED RELEASE PHOSPHATIC FERTILIZER TO IMPROVE GROWTH, YIELD AND PHOSPHORUS USE EFFICIENCY OF WHEAT CROP, , Volume 55, Issue 3.
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