PRECISION MANAGEMENT PRACTICES IN AEROBIC RICE UNDER DRIP IRRIGATION
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Date
2017-09-11
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Field studies on precision management practices in aerobic rice under drip
irrigation was conducted at ZARS, GKVK, Bengaluru during 2015 and 2016 on red
sandy loam soil with medium available NPK with an objective to assess the spatial
variability, precision nutrient management for targeted yield of rice and to study the
effect of precision management practices on growth, yield, water productivity, nutrient
uptake and economics of aerobic rice under drip irrigation. The experiment on precision
nutrient management for targeted yield of rice was laid out in split plot design with three
replications. Application of N & K in four equal splits up to 105 DAS recorded
significantly higher grain yield (10.38 t ha-1) and net returns (` 1,06,394 ha-1) over
application of N & K in three split doses. Moreover higher grain yield (12.08 t ha-1) and
net returns (` 1,22,548 ha-1) was recorded at targeted yield level of 12 t ha-1. The
experiment on precision management practices for growth and yield of aerobic rice was
laid out in RCBD design with factorial concept including one control, one absolute
control and replicated thrice. Among precision management practices, application of N &
K in four equal splits up to 105 DAS with planting geometry of 25×15 cm with drip
irrigation scheduling at 125% PE up to tillering + 150% PE from tillering to PI + 200%
PE from PI to physiological maturity recorded higher grain yield (8.56 t ha-1), net returns
(` 82,277 ha-1) and 119 per cent higher WUE (73.6 kg ha-cm-1) than control. Fertilizer
recommendation based on STCR approach saved 50.75 per cent nitrogenous and 87.3 per
cent potassic fertilizers compared to general recommendation of fertilizers for targeted
yield of 6 t ha-1.
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