Soil Properties and Organic Carbon Composition Using Infrared Techniques in Rubber Growing Soil under Different Rubber-based Intercrops
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Abstract
Rubber-based intercropping is a way to raise farmer incomes and increase plant residues, resulting in soil organic carbon accumulation. Organic carbon from different plant residues has different organic carbon compositions. Therefore, properties and organic carbon composition using infrared techniques of soil under rubber monoculture and rubber-based intercropping were studied. Rubber-growing soils were sampled from rubber monoculture (M), rubber-bamboo (MBa), rubber-Hopea odorata (MH), and rubber-Gnetum gnemon (MG) (12 location). The result showed that soil saturated hydraulic conductivity in the rubber-based intercrop growing soils tended to be higher than that in the rubber monoculture growing soil. The highest values of extractable calcium and magnesium were found in MG and MBa, but the organic carbon and the organic carbon composition were not different. Percent relative absorbance (%rA) of aliphatic (2,920) in MG was similar to M, and %rA of carboxyl (1,630) in MG tended to be relatively low and comparable to MH. However, carboxyl/aliphatic ratio in the MG tended to be the narrowest value, while the MBa tended to be the most comprehensive value. This result indicated that the MG had the lowest degradation rate. Therefore, choosing Gnetum gnemon is an interesting plant used as an intercrop with rubber for improving soil fertility.
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References
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