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M. Sc. Dissertations

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20121
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Subject: Agronomy × Author: Rajesh Kumar × End date: 2016 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of planting time on growth, yield and quality of bt cotton (gossypium hirsutum L.) genotypes
    (CCSHAU, 2012) Rajesh Kumar; Bhattoo, M.S.
    A study entitled, Effect of planting time on growth, yield and quality of Bt cotton (Gossypium hirsutum) genotypes , was conducted at CCS, Haryana Agricultural University, Cotton Research Station, Sirsa during Kharif 2011. The soil of experimental field was sandy loam in texture and slightly high in pH. Soil tested low in organic carbon and available nitrogen, medium in available phosphorus and high in available potassium. The experiment was conducted in split plot design with three replications. The combination of four dates of sowing viz. D1=3rd week of April (20th April), D2=1st week of May (6th May), D3=3rd week of May (18th May) and D4=1st week of June (6th June) were kept in main plots and three genotypes viz., V1= RCH 134, V2= NCS 855 and V3= Bio 6488 were kept in sub plots. Maximum plant height and dry matter was recorded at 3rd week of May sowing. Maximum sympods, number of bolls, yield plant-1, seed cotton yield and lint yield ha-1 were recorded in early sowing (D1 and D2) which were significantly higher than late sowing (D3 and D4). Plant height was highest in NCS 855 but the dry matter production was significantly higher in RCH 134. Sympods, number of bolls, yield plant-1, seed cotton yield and lint yield ha-1 were significantly higher in NCS 855 than RCH 134 but it was statistically at par with Bio 6488. All the fibre quality parameters were not affected significantly by dates of sowing except fibre strength which was found better in late sowing. Uniformity ratio and fibre fineness were found better in RCH 134 than other two genotypes but the span length was superior in NCS 855. Significantly higher protein content (%) in cotton seed was recorded in D3 than all other sowing dates. However, oil content (%) was recorded significantly higher in D1 and D2 than D3 and D4. Genotype RCH 134 recorded significantly higher oil and protein content than Bio 6488 and NCS 855. Early sowing had a significant effect on available N, P and K (kg ha-1) in the soil. Availabe N (kg ha-1) was found more in RCH 134 sown field in 0-15 cm soil depth and in Bio 6488 in 15-30 cm depth but the available phosphorus and potash (kg ha-1) was highest with significant differences in Bio- 6488 and NCS 855, respectively. Sowing on 3rd week of April resulted in higher total cost of cultivation, gross returns, net returns and B:C ratio than all other sowing dates. NCS 855 genotype produced higher cost of cultivation, gross returns, net returns and B:C ratio as compared to other genotypes.