STUDIES ON DRIP FERTIGATION IN AEROBIC RICE (Oryza sativa L.)
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Date
2015-09-14
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Three field experiments were conducted at ZARS, GKVK, Bengaluru during
2013 and 2014 on red sandy clay loam soil with medium available NPK to evaluate rice
genotypes for drip irrigation, to optimize drip irrigation scheduling and to know the effect
of fertigation intervals and combinations of fertilizer sources on growth and yield of
aerobic rice. The experiment on evaluation of rice genotypes for drip irrigation was laid
out in split plot design with three replications. Aerobic rice with drip irrigation recorded
higher grain yield (7803 kg ha-1), net returns (` 126471 ha-1) and WUE (103.0 kg
ha-cm-1) over puddle transplanted rice. Among genotypes, KRH-4 hybrid recorded higher
grain yield (8092 kg ha-1), net returns (` 85917 ha-1) and WUE (76.1 kg ha-cm-1).
Interactions, drip irrigated KRH-4 recorded higher grain yield (9014 kg ha-1), net returns
(` 96872 ha-1) and WUE (112.4 kg ha-cm-1). Experiment on drip irrigation scheduling in
aerobic rice laid out in RCBD with three replications, drip irrigation at 1.25 Epan up to
tillering + 1.5 Epan tillering to panicle emergence + 2.0 Epan panicle emergence to
maturity recorded higher net returns (` 179212 ha-1), WUE (123.0 kg ha-cm-1) and 40 per
cent higher grain yield (11216 kg ha-1), with 55.4 per cent water saving than puddle
transplanted rice. Effect of drip fertigation intervals and combination of fertilizer sources
on aerobic rice laid out in factorial RCBD replicated thrice. Drip fertigation once in two
and four days with 50 per cent WSF and 50 per cent NF combination realized higher
grain yield (11331 and 10569 kg ha-1), net returns (` 113726 and 102165 ha-1) and B:C
ratio (2.65 and 2.49) respectively, in aerobic rice
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