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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.
Soil Science Division,
Nuclear Institute of Agriculture, Tando Jam, Sindh, Pakistan
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