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- W2010414268 abstract "Organic matter management is believed to solve many of the chemical and physical problems of coarse-textured, low fertility soils of Northeast Thailand. We tested the influence of different plant residues available in this area on soil C and N dynamics in upland (Oxic Paleustult) and lowland (Aeric Paleaquult) soils. Residues included groundnut (upland) or Sesbania rostrata stover (lowland), rice straw, Tamarindus indica and Dipterocarpus tuber-culatus leaves applied at 10 t ha−1 (dry matter). For the former three residues additional application rates of 20 t ha−1 were included as well as a mixture (50:50) of groundnut Sesbania — rice straw treatment. Groundnut stover and Sesbania had C/N ratios <28:1 and low lignin, and polyphenol contents whereas rice straw had the highest C/N ratio of 79:1. Dipterocarp and tamarind leaves were characterized by high lignin (>17%) and polyphenol (>4.5%) contents. These latter residues, despite slow decomposition, apparently resulted in only moderate soil C (<1 mm) build-up after one year due to the fact that a large proportion of their residues remained in particulate form (>1 mm). Thus the mixture of groundnut/Sesbania with straw was among those residue treatments that led to the highest soil C (<1 mm) buildup under both upland and lowland conditions.Groundnut stover under upland condition resulted in immediate net N mineralisation but also an early decline in soil mineral N presumably due to leaching. By mixing groundnut or Sesbania with rice straw with a high C/N ratio residue N mineralisation could be delayed and prolonged, improving potentially the synchrony of N release and plant demand. Additions of dipterocarp and tamarind resulted in an initial N immobilization phase and net mineral N release remained low thereafter. Dynamics of microbial biomass N were closely related to N mineralisation and immobilization cycles in both upland and lowland experiments. Residue N concentration was the most significant factor controlling N release in both systems. While extractable polyphenols exhibited a significant influence on N release in upland conditions their effect was not evident in the lowland." @default.
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- W2010414268 date "2000-04-01" @default.
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- W2010414268 title "Soil organic matter and nitrogen transformation mediated by plant residues of different qualities in sandy acid upland and paddy soils" @default.
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- W2010414268 doi "https://doi.org/10.1016/s1573-5214(00)80006-8" @default.
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