Study on crop weather relationships in cotton hybrids
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Date
2014
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CCSHAU
Abstract
The study entitled „Study on crop weather relationships in cotton hybrids”was conducted at the research area of the Department of Agricultural meteorology, CCS Haryana Agricultural University, Hisar, during the kharif season of 2013-14. The main plots treatments consisted of three date of sowing ( 4th week of April, 2nd week of May and 4th week of May) and the sub-plots consisted of three varieties (Two Bt cotton hybrids-Ankur 3028BG II, BIO 6588 BG II and one non Bt cotton hybrid HHH 223. The fifty four treatment combinations were tested in split plot design with three replications.
The 4th week of April sown crop had highest thermal and radiation indices and TUE and RUE were also highest in this treatment as compared to 2nd week of May and 4th week of May sown crops, The transmitted photosynthetically active radiation (TPAR) was recorded lowest in D1 as compared to D2, and D3 treatments. All growth parameters, yield and yield attributes were found highest in 2nd week of May sown crop.
Among cotton varieties, Ankur 3028BG II consumed highest heat units, heliothermal units, photothermal units and thermal interception rate as compared to BIO 6588 BG II and HHH 223 under different growing environments. The efficiency of PAR utilization for dry matter production was highest in Ankur 3028BG II at all phenophases. The efficiency of heat utilization was also more in Ankur 3028BG II as compared to BIO 6588 BG II and HHH 223 at all phenophases.
The correlation and regression analysis were carried out to study the relationship between agrometeorological and crop parameters. Among the phenophses , the weather parameters during 50 per cent flowering were better associated with the crop parameters than those of other phenophase. Maximum temperature, minimum temperature and vapour pressure deficit showed a strong positive correlation with seed cotton, cotton seed, cotton lint and bolls per plant during boll opening stage, whereas morning and evening relative humidity showed negative correlation with seed cotton, cotton seed, cotton lint and bolls per plant during vegetative, flowering stage and boll opening stage.
Among the agrometeorological indices, HTU were highly correlated with seed cotton, cotton seed, cotton lint and bolls per plant followed by PTU and HU. Among all weather parameters, maximum temperature during boll opening stage individually explained 92 per cent variability in seed cotton yield and yield attributes.
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Keywords
Yield attributes, Agrometeorological indices, Correlation regression