OPTIMIZING NPK NUTRIENT MANAGEMENT UNDER INTERCROPPING SYSTEM IN AEROBIC RICE (Oryza sativa L.)
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Date
18-11-11
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University of Agricultural Sciences GKVK, Bangalore
Abstract
A field experiment entitled “Optimizing NPK nutrient management
under intercropping system in aerobic rice (Oryza sativa. L.) was
conducted at Zonal Agricultural Research Station, University of
Agricultural Sciences, Gandhi Krishi Vignana Kendra, Bengaluru, during
Kharif 2010. The experiment was laid out in Randomized Completely
Block Design with 12 treatments combinations consisting three levels of
fertilizers viz., 100 per cent, 125 per cent and 75 per cent of
recommended fertilizer dose and three intercrop viz., amaranthus,
frenchbean and raddish with sole rice which are replicated thrice.
Among the treatments significantly higher grain yield was recorded
in aerobic rice + amaranthus + 125% RDF (5471 kg ha-1) followed by
aerobic rice + 125% RDF (5197 kg ha-1). Significantly lower grain yield
was recorded with aerobic rice + raddish + 75% RDF (3771 kg ha-1). The
increase in grain yield was in the order of 13.5 and 7.4 per cent in
aerobic rice + amaranthus + 125% RDF and aerobic rice + 125% RDF
over aerobic rice + 100%RDF respectively.
Among the different treatments significantly higher rice equivalent
yield (REY) was recorded in aerobic rice + amaranthus + 125% RDF
(17013 kg ha-1). Significantly lower grain yield was recorded with aerobic
rice + 75% RDF (4029 kg ha-1).
Aerobic rice + amaranthus + 125% RDF recorded a significantly
higher net return (Rs. 43, 798 ha-1) and B:C ratio (3.61) as compared to
other treatments.
From this experiment it is concluded that aerobic rice +
amaranthus + 125% RDF is helpful in achieving higher productivity in
aerobic rice based intercropping system under Agroclimatic zone-5 of
Karnataka.
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