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PATTERN OF NITROGEN RELEASE DURING DECOMPOSITION OF SOME GREEN MANURES IN A TROPICAL ALLUVIAL SOIL
C. S. WEERARATNA
Plant and Soil
Vol. 53, No. 3 (NOVEMBER 1979), pp. 287-294
Published by: Springer
Stable URL: http://www.jstor.org/stable/42934966
Page Count: 8
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The pattern of release of ammonium and nitrate nitrogen during decomposition of glyricidia, sunflower, centrosema, calapagonium and crotolaria under aerobic and anaerobic conditions, in an alluvial soil over a period of 7 weeks was studied. Under aerobic conditions, the NH₄⁺-N production reached the maximum after the 4th week. Nitrate-N and total available-N increased in all cases throughout the incubation period except in sunflower. This showed a nitrification inhibitory effect and had a relatively high C/N ratio (11.0) and low total N content (2.8%). In general the increase in NH₄⁺-N and NO₃⁻-N was more rapid in the early stages of incubation. Under anaerobic conditions, the production of these nutrients was considerably low. Soil organic matter mineralized faster than the added organic material which started to decompose slowly after sometime. Nitrate-N tend to decrease during incubation attributable to denitrification.
Plant and Soil © 1979 Springer