Effect of Optical Sensor Based Nitrogen Management on N, P and K Content and Uptake by Irrigated Wheat (Triticum aestivum L.)

A field experiment was conducted at CCSHAU, Hisar to study the effect of optical sensor based N management on N, P and K content of grain and straw as well as N, P and K uptake by grain and straw by wheat crop during rabi season of 2013-14. N content in grain was more in treatments having N application at 3^rd irrigation as compared to N application at 2^nd irrigation. Total N, P and K uptake as well as N, P and K uptake separately by grain and straw, generally increased at increasing the level of fixed rate N application, when equivalent treatments (i.e. treatments having same time of GreenSeeker (GS) guided N application) were compared. Significantly higher N uptake by grain in two stage (i.e. at 2^nd and 3^rd irrigation stage) applied N using GS over 2^nd irrigation applied N indicated that 3^rd irrigation applied N is important regarding the grain N uptake.