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ABSTRACT
A study on seasonal variation in nitrate reductase activity and total nitrogen was conducted at National Research Centre for Agroforestry, Jhansi, India, on Albizia amara, a fodder yielding, drought resistant and fire hardy tree of the arid and semi-arid regions of the country. Total nitrogen did not exhibit a distinct linear relationship with nitrate reductase activity although they were directly related. Significant variation in nitrate reductase activity due to season was observed. Nitrate reductase activity was lowest in May and June. Nitrate reductase activity and total nitrogen showed distinctly different patterns of seasonal variation. Summer months showed significant differences in both the parameters in comparison with winter and monsoon months.