Comparative efficiency of different levels of nitrogen application and their impact on yield, uptake, N-use efficiency and N-recovery were studied with rice-Bhavani (Soil- Typic Haplustall), ragi-Co 11, Groundnut-Pol. 2 (Soil Typic Ustorthent), and Cotton- MCU 5 (Soil Typic Chromustert). Nitrogen fertilizer incorporation exhibited a general increase in the yield and uptake of nitrogen by crops, which was more prominent and significant by the addition of 100 kg N/ha for rice, 45 kg N/ha for ragi, 10 kg N/ha for groundnut and 60 kg N/ha for Cotton. Beyond these levels, the yield increases were not apparent, Added fertilizer N and its positive effect in enhancing the N use offi- ciency/recovery and economy were well manifested at the lower N-levels. The lower efficiency and recovery of fertilizer N at higher N-application rates could be due to higher N-losses associated with larger dressings.
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