Response of Bt Cotton to Crop Geometry and Supplemental Irrigation in Northern Dry Zone of Karnataka
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Date
2015-07
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University of Agricultural Science, Dharwad
Abstract
ABSTRACT
The field experiment was conductedat college of Agriculture farm, Vijayapura during kharifseason 2014-15 to study the performance of Bt cotton to crop geometry and supplemental irrigation in northern dry zone of Karnataka.The experiment was laid out in split plot design with four moisture conservation practices in main plot treatments and threespacings as sub plot treatments with three replications. The result indicated that,two supplemental irrigations at flowering and boll formation stages recorded significantly higher seed cotton yield (1777 kg/ha)and net returns (Rs. 42236 ha-1)compared to other moisture conservation practices. Crop geometry of 90 cm x 60 cm recorded significantly higher seed cotton yield (1519 kg/ha)and net returns (Rs. 34187 ha-1) over the other spacings. Interaction of two supplemental irrigations at flowering and boll formation stages with 90 cm x 60 cm row spacing recorded significantly higher seed cotton yield (1974 kg/ha) andnet returns (Rs. 50131 ha-1) compared to other interactions.However, significantly higher number of good and bad opened bolls per plant, number of bolls per plant, boll weight (gm) was recorded in the interaction of two supplemental irrigations at flowering and boll formation stages with 90 cm x 60 cm spacing ascompared to other interactions.
Soil moisture content was significantly higher in moisture conservation practices over without moisture conservation practice. At different stages of the crop growth, spacing of 120 cm x 60 cm recorded significantly higher soil moisture content and it was on par with 90 cm x 60 cm spacing. Among the interactions, interaction of moisture conservation practices (M2, M3 and M4) with spacing of 90 cm x 60 cm and 120 cm x 60 cm recorded significantly higher soil moisture contentcompared to other interactions.
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