Effect of nitrogen doses and its time of application on growth and yield of Bt cotton (Gossypium hirsutum)
DOI:
https://doi.org/10.59797/ija.v61i1.4337Keywords:
Bt Cotton, Growth, N-application, Nitrogen levels, YieldAbstract
A field experiment was conducted during the rainy (kharif JuneNovember) season of 2014 at New Delhi, to study the effect of different levels and time of nitrogen (N) application on growth and yield of Bt cotton (Gossypium hirsutum L.). The results revealed that application of increasing levels of N from 100 to 175 kg/ha showed an in- crease in plant height (134.1 cm to 164.4 cm), leaf-area index (LAI) (2.50 to 8.91), dry-matter production (301.7 to 362.8 g/pl), crop growth rate (CGR) in Bt cotton, although the highest values of these parameters were recorded with application of 175 kg N/ha. Application of N when applied basal also recorded significant influence on various growth parameters over without basal dose of N. The yield of Bt cotton was also increased significantly by differ- ent N levels. The highest seed cotton yield (2.65 t/ha) was recorded with the application of 175 kg N/ha, being 25.6, 14.7 and 3.5% higher than 100, 125 and 150 kg N/ha, respectively. Basal application of N @ 30 kg/ha has an edge over the treatments where basal application of N was not done with respect to yield-contributing charac- ters (sympodial branches/plant, opened bolls, total number of bolls and boll weight) and yield of Bt cotton.References
Bhalerao, P.D., Deshmukh, P.W., Gaikwad, G.S. and Imade, S.R_CIT_2012. Response of Bt. cotton (Gossypium hirsutum) to spac- ing and fertilizer levels under rainfed conditions. Indian Journal of Agronomy 57(2): 17679_CIT_Cochran, W.G. and Cox, G.M. 1967. Experimental Designs, edn 3, p. 611. Asia Publication House, Mumbai, Maharashtra_CIT_Giri, M.D., Dhonde, M.B., Bodake, P.S. and Patil, V.S. 2014. Pro- ductivity, nutrient uptake and nitrogen-use efficiency of Bt_CIT_Cotton (Gossypium hirsutum) in relation to split and foliar application of nitrogen on Inceptisols. Indian Journal of Agronomy 59(3): 43944_CIT_Guthrie, D.S. 1991. Cotton response to starter fertilizer placement and planting dates. Agronomy Journal 83(5): 83639_CIT_Kumbhar, A.M., Buriro, U.A., Junejo, S., Oad, F.C., Jamro, G.H., Kumbhar, B.A. and Kumbhar, S.A. 2008. Impact of differ- ent nitrogen levels on cotton growth, yield and N uptake planted in legume rotation. Pakistan Journal of Botany 40(2): 76778_CIT_Liu, S., Zhang, S. and Zhang, L. 2010. Above-ground dry matter accumulation of cotton genetics at different nitrogen appli- cations. Cotton Science 22(1): 7782_CIT_Main, C.L., Barber, L.T., Dodds, D.M., Duncan, S.R., Edmisten, K.L., Jones, M.A., Whitaker, J.R., Morgan, G., Osborne, S., Boman, R.K., Norton, R. and Nichols, R.L. 2011. Cotton cultivar response to nitrogen fertilization. (In) Proceedings Beltwide Cotton Conference, 47 January Atlanta, GA, pp_CIT_17_CIT_Nehra, P.L. and Kumawat, P.D. 2003. Response of hirsutum cotton varieties to different spacing. Journal of Cotton Research and Development 17(1): 4142_CIT_Nichols, R.L. and Green, C.J. 2003. Estimating cottons nitrogen needs. (In) Proceedings of the Beltwide Cotton Conference, 710 January, Nashville, TN, pp. 17578_CIT_Pettigrew, W.T. and Adamezyk, J.J. 2006. Nitrogen fertility and planting date effects on lint yield and Cry l Ac (Bt) endotoxin production. Agronomy Journal 98(6): 69197_CIT_Reddy, P.R.R. and Gopinath, M. 2008. Influence of fertilizers and plant geometry on performance of Bt cotton hybrids. Journal of Cotton Research and Development 22(1): 7880_CIT_Singh, D., Pandey, R., Sharma, S.K. and Kumar, V. 2008. Effect of crop geometry and planting methods on growth and of Bt and non Bt cotton hybrids in cotton wheat system under north western plain zones. Journal of Farming System Re- search and Development 14(1): 4649_CIT_Srinivasan, G. 2006. Agronomic evaluation of Bt cotton hybrids in summer irrigated tract of southern Tamil Nadu. Journal of Cotton Research and Development 20(2): 22425_CIT_Srinivasulu, K., Hema, K., Prasad, N.V.V.S.D. and Krishna Rao, K.V. 2006. Performance of cotton hybrids under different spacings and nitrogen levels in black cotton soils of coastal Andhra Pradesh. Journal of Cotton Research and Develop- ment 20(2): 99101_CIT_Zhao, D., Wright, D., Marois, J. and Mackowaik, C. 2009. Cotton nitrogen uptake and nitrogen use efficiency in 2 cropping systems. (In) Proceedings of the Beltwide Cotton Confer- ences, National Cotton Council of America, 912 January, Memphis, TN, pp. 87073.
