PJB-2011-394
EFFECT OF PHOSPHORUS FERTIGATION IN WHEAT ON DIFFERENT SOILS VARYING IN CaCO3 LEVELS
MUHAMMAD YOUSUF MEMON, JAVAID AHMAD SHAH*, PARVEZ KHAN, MUHAMMAD ASLAM AND NIZAMUDDIN DEPAR
Abstract
Low native soil phosphorus availability coupled with poor utilization of added phosphorus is one of the major constraints limiting the productivity of alkaline and calcareous soils of Pakistan. With a view of addressing this issue, a field experiment was conducted to compare the efficacy of two methods of phosphorus application; broadcast (0 and 100 kg P2O5 kg ha-1) and fertigation (50, 75 and 100 kg P2O5 ha-1) in calcareous soils varying in CaCO3 concentrations (6, 9 and 13% CaCO3). Phosphorus fertigation @ 100 kg ha-1 significantly enhanced the grain (4.4 tons ha-1) and biological yields (11.4 tons ha-1) as compared to control and broadcast at each level of CaCO3%. The maximum P uptake (16.6 kg ha-1) and P (10.0%) recovery were observed with fertigated P (100 kg ha-1) at 6%CaCO3 level in soil. The premier agronomic efficiency recorded with P fertigation at 50 kg ha-1, was (147.7 %) more than broadcasted P (100 kg ha-1). The results revealed that the fertigation method remained most efficient for phosphorus application compared to the conventional broadcasting method in calcareous soils.
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