Optical sensor-based nitrogen management for irrigated wheat in the Indo-Gangetic plains
Bijay-Singh, R.K. Sharma, Jaspreet-Kaur, M.L. Jat, K.L. Martin, Yadvinder-Singh, Varinderpal-Singh, H.S. Thind, H.S. Khurana, M. Vashistha, W.R. Raun, and R. Gupta
Robust relationships were observed between in-season GreenSeeker’ optical sensorbased estimates of yield at Feekes 5-6 and 7-8 growth stages and actual wheat yields. Sensor-guided fertilizer N applications resulted in high yield levels and high N use effiiency. Application of 90 kg N/ha at planting, or in two equal doses at planting and crown root initiation stage, were appropriate prescriptive fertilizer N management options before applying a corrective GreenSeeker guided fertilizer N dose for the Indo-Gangetic Plains (IGP) in northwest India.