STUDIES ON NUTRIENT AND WEED MANAGEMENT IN HYBRID COTTON (Gossypium spp.) UNDER SOUTHERN DRY ZONE OF KARNATAKA
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Date
2018-12-10
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK BENGALURU
Abstract
The study comprising of two field experiments were conducted at ZARS, V. C.
Farm, Mandya during Kharif season of 2016 and 2017 in Southern Dry Zone of
Karnataka to optimize levels of major nutrients and to identify suitable herbicides for
effective controlling of weeds in hybrid cotton. The experiment on nutrient management
was laid out in RCBD with three replications using factorial concept involving nitrogen,
phosphorus and potassium levels. The results revealed that application of 150 kg N ha-1
(irrespective of P and K) recorded significantly higher seed cotton yield (1857 kg
ha-1
), nutrient uptake (114.01, 33.31 and 127.44 kg NPK ha-1
) and net returns (` 46,198
ha-1
). Among the phosphorus levels, significantly higher seed cotton yield (2046 kg ha-1
),
nutrient uptake (125.63, 36.70 and 140.42 kg NPK ha-1
) and net returns (` 54,383) were
recorded with application of 75 kg P2O5 ha-1
(irrespective of N and K). Among potassium
levels, application of 100 kg K2O ha-1
(irrespective of N and P) recorded significantly
higher seed cotton yield (1942 kg ha-1
), nutrient uptake (119.25, 34.84 and 133.29 kg
NPK ha-1
) and net returns (` 49,608 ha-1
). The experiment on weed management was laid
out in RCBD and replicated thrice. Pendimethalin 38.75 EC @ 0.75 kg a.i. ha-1
as preemergence spray at 3 DAS fb Pyrithiobac sodium 10 SC @ 62.5 g a.i. ha-1 + Fenoxaprop
p ethyl 9 EC @ 62.5 g a.i. ha-1
at 2 to 4 leaf stage of weeds with hoeing at 60 DAS
recorded higher seed cotton yield (2104 kg ha-1
), WCE (72.80%) and net returns (`
56,296 ha-1
) over weedy check.