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Effects of chemical composition on N, Ca, and Mg release during incubation of leaves from selected agroforestry and fallow plant species

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Title Effects of chemical composition on N, Ca, and Mg release during incubation of leaves from selected agroforestry and fallow plant species
 
Creator Tian, G.
Kang, B.
Brussaard, Lijbert
 
Subject ALLEY CROPPING
COMPOSITION
MINERALIZATION
 
Description Nitrogen, Ca and Mg release from leaves of ten selected plant residues with varying chemical compositions was studied under laboratory conditions. Three patterns of N-release were observed over a seven week incubation period: (a)Gliricidia sepium, Leucaena leucocephala, Mucuna pruriens andCentrosema pubescens leaves showed rapid N release, (b)Acioa barteri andDialium guineense leaves immobilized N, and (c)Alchornea cordifolia, Anthonata macrophylla, Cassia siamea andPterocarpus santalinoides leaves initially showed N immobilization which gradually changes to net mineralization after about four weeks of incubation. Nitrogen mineralization rate constant (k) ranged from −0.0018 (A. barteri) to 0.0064 day−1 (G. sepium). Statistical analysis of data showed that N mineralization rate constants are significantly correlated with initial N, polyphenol and lignin contents of leaves. Nitrogen release increased with increasing N content and decreased with increasing contents of polyphenols and lignin. Addition of leaves from all species significantly increased soil exchangeable Ca and Mg levels.L. leucocephala, G. sepium, C. pubescens andM. pruriens showed relatively high Ca and Mg release rates. Calcium release rate was related to N release rate rather than to initial Ca content.
Peer Review
 
Date 2018-12-19T07:01:12Z
2018-12-19T07:01:12Z
1992
 
Type Journal Article
 
Identifier Tian, G., Kang, B. & Brussaard, L. (1992). Effects of chemical composition on N, Ca, and Mg release during incubation of leaves from selected agroforestry and fallow plant species. Biogeochemistry, 16, 103-119.
0168-2563
https://hdl.handle.net/10568/98651
 
Language en