Effect of continuous cropping and fertilizer use on the organic nitrogen fractions in a typic ustochrept soil |
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| Authors: | A Subba Rao A B Ghosh |
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| Institution: | (1) Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, 110012 New Delhi, India;(2) Present address: Department of Soil Science and Agril. Chemistry, Agricultural College, 522101 Bapatla, Andhra Pradesh |
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| Abstract: | Summary The influence of continuous cropping and soil test based fertilizer use on the organic nitrogen fractions in the plough layer
has been studied in a Typic Ustochrept soil. Seven years of multiple cropping without manuring caused marked depletion in
all the hydrolysable fractions except unidentified hydrolysable N namely, hexosamine (48.8%), hydrolysable ammonium (23.9%)
and amino acid (7.3%) as compared to an adjacent fallow. Fertilizer nitrogen application maintained the levels of various
forms of N as in the fallow plots and nitrogen in conjunction with phosphorus raised the status of amino acid N. Phosphate
improved the contents of hydrolyzable ammonium and total hydrolyzable N whereas farmyard manure enhanced the latter only.
The system of intensive cropping followed with appreciably high doses of fertilizers favoured greater immobilization of N
in hydrolyzable ammonium and total hydrolyzable fractions.
Original not seen |
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| Keywords: | Continuous cropping Fertilizer use Multiple cropping Nitrogen fractions Nitrogen losses |
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