Abstract
A field experiment was conducted at ICAR–Indian Agricultural Research Institute (IARI), New Delhi during kharif 2013–14 to study the effect of four nitrogen (N) levels on crop productivity and nitrogen-use efficiency in Bt cotton in a factorial randomised complete block design (RCBD). There were nine treatments, viz. (i) 4-N rates (100, 125, 150, and 175 kg/ha as urea), (ii) two rates of N application at sowing (0 and 30 kg N/ha) and (iii) one absolute control. Significantly higher seed cotton and lint yields were obtained with application of 175 kg N/ha along with basal application of 30 kg N/ha compared to remaining treatment combinations. Total N-uptake, N-harvest index and normalized difference vegetative index (NDVI) of Bt-cotton were significantly higher at 175 kg N/ha compared with rest of N levels. However, highest N-use efficiency indices were recorded with 150 kg N/ha. A strong and positive correlation (r2=0.804-0.835) was observed between yield and NDVI indicating that NDVI could be used for predicting the potential yield of Bt cotton in semi-arid north Indian plains.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
