Effect of S and N nutrition on N-accumulation and N-harvest in rapeseed-mustard (Brassica juncea L. and Brassica campestris L.)

Abdin, M.Z.; Ahmad, A.; Khan, I.; Qureshi, M.I.; Abrol, Y.P.

Plant nutrition food security and sustainability of agro ecosystems through basic and applied research Fourteenth International Plant Nutrition Colloquium, Hannover, Germany: 816-817

2001


Accession: 003724006

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Abstract
The effect of S and N application on N-accumulation and N-harvest in rapeseed mustard (Brassica juncea, V1; and Brassica campestris, V2) was studied under field conditions in New Delhi, India with a randomized block design. Three treatments viz. 0 kg S/ha + 100 kg N/ha (T1), 40 kg S/ha + 100 kg N/ha (T2) and 60 kg S/ha + 150 kg N/ha (T3) were applied. The results showed that application of S along with N increased N-accumulation in both genotypes at all growth stages compared with N applied alone. This increase in N-accumulation was due to an increase in nitrate assimilation from reduced nitrogen forms as evidenced by the higher nitrate reductase (NR) activity in the leaves of plants grown with both S and N. This showed that application of S along with N considerably reduced the nitrate content in the leaves due to higher NR activity. The decline in nitrate assimilation was followed by an overall increase in N-accumulation in plants. Consequently, N content in the plant was increased from 22.1 to 146.2% and from 25.5 to 249.5% in V1 and V2, respectively, with the application of S along with N, compared with the application of N alone. N-harvest index was also higher in plants grown with both S and N compared with N alone. It is concluded that application of S along with N increases the accumulation of N. The treatment, T2 resulted in maximum improvement in these parameters.