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General Chemical Fertility and Chemical Processes of Grey Degraded Soils as a Problem Soil in Viet Nam

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概要 General chamical properties were analyzed for profile samples of four grey degrated soils collected at the sites different in land use, landform, and parent material, in Viet Nam. The chamical fertili...ty of grey degrated soils was found to be commonly poor in organic matter, the nitrogen and phosphorus status, and exchangeable "bases". The vertical movement of free iron oxides was observed for the paddy soils and the simultaneous movement of organic components and free iron oxides was suggested for the forest soil. Reduction and oxidation was considered to the paddy soil while podzoliation was to the forest soil as mechanisms of the eluviation-illuviation of the chamical compounds. The mechanism of the clay degradation was reevaluated to the paddy soil, while leaching and accumulationi was proposed as a main mechanism to the forest soil. The careful management such as regular addition of organic amendments and spilt dressing of chemical fertilizers, in addition to application of iron-supplying material, was recommended to the cultivation of paddy rice in the degrated paddy field.続きを見る

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登録日 2009.04.22
更新日 2017.02.02