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NITROGEN MINERALIZATION AND NITRIFICATION DURING INCUBATION OF EAST PAKISTAN 'TEA' SOILS IN RELATION TO pH

M. ISHAQUE and A. H. CORNFIELD
Plant and Soil
Vol. 37, No. 1 (AUGUST 1972), pp. 91-95
Published by: Springer
Stable URL: http://www.jstor.org/stable/42932259
Page Count: 5
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NITROGEN MINERALIZATION AND NITRIFICATION DURING INCUBATION OF EAST PAKISTAN 'TEA' SOILS IN RELATION TO pH
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Abstract

A study was made of the effects of increasing pH, by addition of varying levels of calcium carbonate, on N-mineralization and nitrification during aerobic incubation (30°C for 12 weeks) of two 'tea' soils (original pH 4.1 and 4.2) from East Pakistan. Mineral-N (NH₃- plus NO₃-N) accumulation increased with pH in both soils. In the low-flat soil maximum nitrate accumulation occurred at pH 5.0, whilst at the higher pH levels mineral-N accumulated mainly as ammonia-N. In the high-flat soil nitrate accumulation increased considerably with pH; mineralized-N was accounted for largely as ammonia at pH 5.0 or less, and almost entirely as nitrate at higher pH levels. Results are discussed in relation to possible occurrence of heterotrophic nitrification in these soils.

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