1Ph. D. Scholar, CCS HAU, Hisar, Haryana, 125 004
2Professor and Associate Dean, PGS, CCS HAU, Hisar, Haryana, 125 004
3Assistant Professor, Agronomy, CCS HAU, Hisar, Haryana, 125 004
4Wheat Agronomist, CCS HAU, Hisar, Haryana, 125 004
CCS Haryana Agricultural University, Hisar, Haryana, 125 004
*Corresponding author Email: dhakaanilkumar@yahoo.in
Online published on 8 September, 2016.
A field experiment was conducted during the winter (rabi) season of 2013–14 at Hisar, to study the GreenSeeker optical sensor based N management vis-a-vis recommended N application in wheat [Triticum aestivum (L.) emend. Fiori & Paol]. Application of 25 + 50 kg N/ha at sowing and 25 days after sowing (DAS) and GreenSeeker guided N application at second and third irrigation i.e. 33 and 31 kg N/ha produced maximum grain yield (6.60 t/ha) and saved 11 kg N/ha. The same treatment recorded 8.4 to 15% and 11 to 27% higher agronomic efficiency and recovery efficiency, respectively as compared to recommended dose of N application. GreenSeeker guided N both at second and third irrigation stage, resulted into significantly improved yield and N-use efficiency. Single stage GreenSeeker guided N at second irrigation was better than third irrigation in terms of yield and N-use efficiency. Three split N application resulted in significantly higher nitrogen recovery efficiency (14.4%) than 2 split application.
Fixed rate and time of N application, GreenSeeker, N-use efficiency, Precision nitrogen man-agement, Wheat
