Articles
INFLUENCE OF VEGETABLE INCLUSION IN RICE MONOCULTURE ON SOIL ORGANIC MATTER QUALITY UNDER SUB-TROPICAL CLIMATE
Article number
958_25
Pages
211 – 217
Language
English
Abstract
Soil organic matter (SOM) quality and its decomposability are influenced by cropping pattern.
In particular, little is known on the specific difference in SOM quality under rice monoculture or combination of vegetables with rice culture.
Therefore, four pairs of fields having vegetable-rice and rice-rice cropping pattern were selected from four different locations in Bangladesh, covering floodplain and terrace soils.
Soils were first physically fractionated into particulate organic matter (POM) and silt and clay sized OM. The silt and clay sized OM was further chemically fractionated by oxidation with 6% NaOCl to isolate an oxidation-resistant OM fraction, followed by extraction of mineral bound OM with 10% HF (HF-res OM). The results show that there is a small increase in POM in vegetable-rice compared with monoculture rice soils.
Among the fractions, a very large share of OM resided in NaOCl oxidizable OC and N in vegetable-rice soils.
The silt and clay organic N was found to be more susceptible to NaOCl treatment compared with organic carbon (OC). Both the HF-extracted (HF-ex) and HF-res OC and N were found to be lower in vegetable-rice soils than in monoculture rice soils.
Results from both physical and chemical fraction of SOM suggest that SOM accumulated in vegetable-rice cropping pattern are more labile than the solely rice based cropping pattern and prone to decompose quickly in any change of land use.
In particular, little is known on the specific difference in SOM quality under rice monoculture or combination of vegetables with rice culture.
Therefore, four pairs of fields having vegetable-rice and rice-rice cropping pattern were selected from four different locations in Bangladesh, covering floodplain and terrace soils.
Soils were first physically fractionated into particulate organic matter (POM) and silt and clay sized OM. The silt and clay sized OM was further chemically fractionated by oxidation with 6% NaOCl to isolate an oxidation-resistant OM fraction, followed by extraction of mineral bound OM with 10% HF (HF-res OM). The results show that there is a small increase in POM in vegetable-rice compared with monoculture rice soils.
Among the fractions, a very large share of OM resided in NaOCl oxidizable OC and N in vegetable-rice soils.
The silt and clay organic N was found to be more susceptible to NaOCl treatment compared with organic carbon (OC). Both the HF-extracted (HF-ex) and HF-res OC and N were found to be lower in vegetable-rice soils than in monoculture rice soils.
Results from both physical and chemical fraction of SOM suggest that SOM accumulated in vegetable-rice cropping pattern are more labile than the solely rice based cropping pattern and prone to decompose quickly in any change of land use.
Authors
M.D. Abdul Kader, S. Sleutel, S.A. Begum , S. De Neve
Keywords
soil organic matter quality, physical fractionation, cropping pattern, rice monoculture, vegetable soil, sub-tropical soil
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