Studies on Saline Soils in Khon Kaen Region, Northeast Thailand : III. Effects of Amelioration Treatments on Physical and Chemical Properties of the Saline Soil

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概要

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• The effects of several amelioration treatments on the physical and chemical properties of the saline soils (Paleustult) in the Khon Kaen Region, Northeast Thailand, were studied. The application of CaSO_4, CaCo_3, converter slag, or compost into the plow layer, the placement of crude oil or rice husks below the plow layer and rice straw mulching were compared. The plots with these treatments were constructed in the field and the moisture content, pH, EC, permeability, clay dispersion, NH_4-N and NO_3-N contents were determined. The evaluation of each amelioration treatment was as follows. Compost application was the most effective, followed by mulching. The addition of adequate, but not excessive amounts of calcium materials was necessary to increase the soil buffering capacity. The crude oil and rice husk plots showed very wide seasonal pH fluctuations as in the case of the control plot. To simulate rainfall infiltration, a leaching experiment was conducted using soils collected periodically from the above plots. The turbidity level (clay dispersion) of the leachate of CaSO_4 and CaCO_3 plot soils was much lower than that of the other plot soils. Compost application also had a suppressive effect on clay dispersion. Clay was dispersed easily in soils from the rice husk and crude oil plots and a high turbidity level of the leachate was observed for the rainy season samples of these plots. By mulching, dispersion was strongly suppressed, which may be due to the stability of the soil aggregates. Leaching speed was negatively correlated with the clay dispersion and it remained high throughout the experimental period (2 years) in the CaSO_4, CaCO_3, converter slag, and compost plots. Therefore, the combination of compost and calcium application to the soil with mulching was considered to be a suitable procedure for the amelioration of this kind of soil.

• 社団法人日本土壌肥料学会の論文

著者

• Kimura Makoto

  School Of Agriculture Nagoya University

• Patcharapreecha P

  Khon Kaen Univ. Khon Kaen Tha

• Topark-Ngarm Bubpha

  Faculty of Agriculture, Khon Kaen University

• Goto Itsuo

  Faculty Of Agriculture Tokyo University Of Agriculture

• Patcharapreecha Pongsiri

  Faculty of Agriculture, Khon Kaen University

• Topark-ngarm Bubpha

  Faculty Of Agriculture Khon Kaen University

• Kimura Makoto

  School Of Agricultural Sciences Nagoya University

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