MANAGEMENT OF EXCESSIVE VEGETATIVE GROWTH OF Bt COTTON (Gossypium hirsutum L.) THROUGH AGRONOMIC PRACTICES AND USE OF GROWTH REGULATORS UNDER IRRIGATED CONDITION
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR – 584 104
Abstract
A field experiment entitled “Management of excessive vegetative growth of Btcotton
(Gossypium hirsutum L.) through agronomic management practices and use
growth regulators under irrigated condition” was conducted during kharif 2018-19 at
Main Agricultural Research Station farm, Raichur, Karnataka. The experiment laid out in
split plot design with three replications. The experiment consisted of two main plot
treatments viz. , 90 × 60 cm (S1) and 120 × 60 cm (S2). The sub plot treatments are M1 :
Nipping at 75DAS, M2 : Nipping at 90 DAS, M3 : Spraying of 0.035% Paclabutrazole
23%SC at 55 DAS and 85DAS, M4 : Spraying of 0.035% Paclabutrazole 23%SC at 55
DAS and 85DAS + Nipping at 75D, M5 : Spraying of 0.035% Paclabutrazole 23%SC at
55 DAS and 85DAS+ Nipping at 90 DAS, M6 : Control and M7 : Farmer practice. The
spacing 90 cm × 60 cm recorded significantly higher seed cotton yield (2693 kg ha-1),
number of good opened bolls per plant (24.6), total number of bolls (29.4), boll weight
(4.7 g), seed cotton yield per plant (126.9 g), sympodial branches per plant (21.2),
sympodial length (31.5 cm), dry matter production per plant (369.60 g), seed index (9.45
g), harvest index (0.43), lint index (4.77), ginning percentage (33.61), mean fibre length
(26.78 mm), fibre strength (29.39 g tex-1), micronaire (4.50), lower nutrient uptake
(141.10, 24.22 and 156.11 kg NPK ha-1), gross returns (Rs. 1,45,416 ha-1), net returns (Rs.
86.379 ha-1) and benefit cost ratio (2.46). Foliar spray of 0.035% Paclabutrazole 23%SC
at 55 DAS and 85DAS + Nipping at 90 DAS (M5) recorded significantly higher seed
cotton yield (2788 kg ha-1), number of good opened bolls per plant (31.37), total number
of bolls (35.50) , boll weight (5.12 g), seed cotton yield per plant (151.2 g), sympodial
branches per plant (24.2), sympodial length (41.3 cm), dry matter accumulation in
reproductive parts (157.49 g plant-1), seed index (9.68), lint index (4.63), harvest index
(0.44) ginning percentage (33.48), uptake of nitrogen, phosphorus and potassium (155.58,
29.09 and 170.04 kg NPK ha-1 respectively), gross returns (Rs. 1.50.552 ha-1), net returns
(Rs. 90.398 ha-1) and benefit cost ratio (2.50).
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