Effect of long term application of nitrogen and phosphorus on crop yields nitrogen uptake and soil nitrogen status in maize and wheat rotation

Brar, S.P.S.; Singh, B.; Benbi, D.K.

Journal of Research Punjab Agricultural University 26(4): 572-580


ISSN/ISBN: 0048-6019
Accession: 007252479

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An experiment was started in Kharif 1970 to study the response of maize and wheat to long-term application of N, NP, NPK and NPK Zn for 14 crop cycles. The response of wheat to applied nitrogen (in the absence of phosphorus) decreased sharply during first three crops and remained static thereafter for the next six crops. When phosphorus was applied along with nitrogen, the yield increases were significant. Similar trend was observed in maize except that the magnitude of response to both nitrogen and phosphorus was less than that observed in wheat. The recovery of applied nitrogen by both the crops was 34 and 27 per cent in N100 and N200 treatments respectively. It increased to 72 and 48 per cent in N100P22 and N200P44 treatments. Application of potassium and zinc did not affect the nitrogen recovery. The total N content in the soil increased from 0.042% in the control to 0.046% in N200 treatment, with appreciable change in available nitrogen. The differences in ammoniacal-N content among control, N100 and N200 were appreciable when N alone was applied. Similar trend was observed in the nitrate-N content.