Nitrogen fertilizer management for enhancing productivity and nitrogen-use efficiency in Bt cotton

RAMANJIT KAUR; V P VERMA; Y S SHIVA; ANCHAL DASS; SEEMA SEPAT

doi:10.56093/ijas.v89i12.96276

Authors

RAMANJIT KAUR Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V P VERMA Ph D Scholar, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
Y S SHIVA Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ANCHAL DASS Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
SEEMA SEPAT Scientist, Division of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi.

https://doi.org/10.56093/ijas.v89i12.96276

Keywords:

Bt cotton, Correlation, N-use efficiency, NDVI, Productivity

Abstract

A field experiment was conducted at ICARâ€“Indian Agricultural Research Institute (IARI), New Delhi during kharif 2013â€“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.

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