PHOSPHORUS AND POTASSIUM MANAGEMENT UNDER INTENSIVE RICE CROPPING IN TUNGABHADRA (TBP) IRRIGATION COMMAND
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Date
14-06-05
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Field experiments were conducted to evaluate the effect of N, P and K levels under
intensive rice-rice cropping system on crop performance, P-K availability, P-K uptake, P-K use
efficiencies and P-K balance studies at Agriculture Research Station, Gangavati, Karnataka during
2000-01.
Application of NPK @ 200:100:75 kg/ha (N:P:K ratio of 2.7:1.3:1.0) to BPT-5204
during kharif and 250:100:75 kg/ha (N:P:K ratio of 3.3:1.3:1.0) for IR-64 during rab/Vsummer was
optimum and economically most remunerative. Though, higher NPK levels and ratios resulted in
higher rice yields, the N:K ratios remained wider than the desired (< 2.0:1.0)'. The farmers control
(230:90:110 kg/ha of NPK) was equally remunerative as above and had more balanced N:P:K ratio
(2.1:0.8:1.0) than in the above treatments. The RDF application resulted in sub-optimal rice nutrition
resulting in significantly lower yield than the above. Phased application of NPK up to BGF stage to a
mid-long duration variety BPT-5204 was beneficial. However, this advantage was not realized
during raMsummer with a mid duration variety like IR-64. The economic analysis also revealed
similar trend.
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