NITRATE LEACHING LOSSES REDUCTION AND OPTIMIZATION OF N-USE EFFICIENCY IN Triticumaestivum L. AND Oryza sativa L. CROP ROTATION FOR ENHANCING CROP PRODUCTIVITY

摘要

Nitrogen management is a major challenge in the environment due toNO3 - leaching and volatilization. To address this problem, a lysimeter experiment was conducted for rice-wheat with two lower N rates (15 and 30) and three higher rates (15, 30 and 45) than recommended rate (N100). Higher leaching of NO3 - was noted with N145 up to86.84 mg/leachate in rice while wheat crop showed maximum leaching 48.62 mg/leachate in same treatment. This revealed that during the rice-wheat rotation, NO3 - leaching losses were the highest during rice growth than that of wheat. The uppermost rice-wheat grain yield was obtained with 15 higher N. The highest rice-wheat NUE was 31.26 g/g and 45.52 g/g with treatment N115, respectively. It is concluded that treatment of N115proved to be efficient than other treatments due to enhanced NUE and yield by reducing NO3 − leaching losses. The findings of current study can be helpful to develop proper N fertilizer management strategies for rice-wheat rotation.