Interactive effect of nitrogen and sulphur on nitrogen harvest of rapeseed-mustard
2001
Ahmad, A. | Khan, I. | Abdin, M.Z. (Hamdard University, New Delhi (India). Center for Biotechnology)
To study the interactive effect of N and S application on nitrogen accumulation, its distribution in various plant parts and nitrogen harvest of rapeseed-mustard (Brassica juncea L. Czern. and Coss., V1; Brassica campe1tris L. V2), field experiments were conducted with three combinations of S and N viz. 0s+100N, 40S+100N and 60S+150N kg ha-1. The results showed that combined application of S and N (40S+100N and 60S+150N kg ha-1) increased the nitrogen accumulation in both the genotypes at all the growth stages over N alone (0S+100N). This increase in nitrogen accumulation in both the genotype at all the growth stages over N alone (0S+100N). This increase in nitrogen accumulation was due to the improvement in the reduction of nitrate into reduced nitrogen as evident from higher nitrate reductase (NR) activity in the leaves of plants grown with both S and N, compared with N alone. Nitrate-N content in the leaves of plants grown with only N was higher compared to those grown with both S and N, showing that application of S along with N appreciably reduced the nitrate content in the leaves due to the higher NR activity. This decline in NO3 was followed by an overall increase in N-accumulation in the plants. Consequently, the nitrogen content in the plant was increased by 11.7-57.6% and 11.0-58.9% in V1 and V2, respectively with the application of S along with N compared to the application of N alone. Nitrogen harvest index was also found higher in the plants grown with both S and N, as compared to those grown with N alone. It is evident from these results that the application of S along with N not only increased N accumulation, but also its mobilization towards economic sinks. Among the different combinations of S and N, 40S+100N proved to be the optimum for higher N-accumulation and N-harvest in rapeseed-mustard.
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