National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
High density planting system have the potential for increased yields in high yielding, high input production systems. To attain higher yields in high density planting system in cotton relative to conventional spaced cotton must depend on increased biomass production or partitioning to boll. The present experiment was conducted for two consecutive seasons to analyse the morpho- phenological characters and leaf CO2 exchange rates of cotton in five different spacings i.e. 45 x 10 cm2, 45 x 15 cm2,45 x 20 cm2, 45 x 30 cm2 and 60 x 30 cm2 in two American cotton genotypes i.e NDLH1938 and NH 615.Wider spacing produced significantly higher growth attributes like boll number (26.3) sympodia (12.4), leaf photosynthetic rate (26.25 μmol m-2 sec-1) at peak bloom stage, stomatal conductance (422.58 μmol H2O m-2 sec-1) and transpiration rate (4.89 mmol H2O m-2sec-1) at boll formation stage.While in closer spacings early square formation and flowering was observed, but dry matter partitioning was slower and total biomass production was significantly low (78.6gm) and consequently the boll weight was less (3.2gm) leading to decreased economic yield. The effect of plant density on leaf area index is additive and varied with plant density from about 4.24- 5.78. Even though the density of plants was increased there is seldom increment in kapas yield as the partitioning is affected due to decrease in leaf CO2 exchange rates.
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