Studies on light interception and its efficiency under different planting geometries of Bt cotton
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Date
2017
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CCSHAU
Abstract
The study entitled ‘Studies on light interception and its efficiency under different planting geometries of Bt cotton’ was conducted at the research area of the Department of Agricultural meteorology, CCS Haryana Agricultural University, Hisar, during the kharif season of 2014-15. The twenty four combinations were evaluated in randomized plot design with three replications. Reflected photosynthetically active radiation after 120 days sowing of crop was maximum in 60×45 cm planting geometry followed by 60×60 cm. Accumulation of heat, heliothermal, photothermal units and intercepted photosynthetically active radiation at maturity stage of crop growth was maximum in
100×60 cm followed by 100×45 cm, 90×60 cm. Radiation use efficiency among all the planting geometries was highest at 120 days after sowing of the crop and was maximum in 100×60 cm followed by 100×45 cm. There was no significant difference in various quality parameters yield viz., span length, uniformity ratio, micronaire and tenacity among all the planting geometries. However, maximum span length was recorded in 100×60 cm, uniformity ratio in 90×60 cm. Evaporation had positive correlation with all crop growth and yield parameters at 50 % square initiation and negative at
50% boll opening while it was positively correlated to dry matter at maturity. Cotton planted in this planting system was highly efficient in conversion of radiation into dry matter production (1.51 g/MJ) at 120 after sowing of the crop.
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