ISSN:
1573-5036
Keywords:
Continuous cropping
;
Fertilizer use
;
Multiple cropping
;
Nitrogen fractions
;
Nitrogen losses
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02374135
Permalink
