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
DOI:
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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