Properties and agricultural potential of red soils in upper part of northern Thailand
2011
Chaleamrach Jitjalearnporn(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) | Irb Kheoruenromne(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) E-mail:[email protected] | Anchalee Suddhiprakarn(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science)
Study on properties and agricultural potential of red soils in upper part of Northern Thailand was carried out on seven selected areas in Chiang Mai and Chiang Rai provinces. Method of study included analysis of soil morphology in the field, laboratory analysis on physicochemical properties and mineralogical characteristics of soil samples according to standard methods. Assessment of the soil fertility status and fertility capability was included. Results of the study revealed that these soils are very deep soils. They are highly developed having fine texture and good structure. These soils are extremely acidic to neutral (pH 4.4-6.8) and their organic matter content ranges from very low to high (1.04-41.3 g/kg). They have moderately low to high cation exchange capacity (7.49-23.00 cmol/kg) and low to medium base saturation percentage (2.88-69.30 percent). The soils have kaolinite as the major mineral in clay fraction. These soils include two areas each of Kandiustult and Kandiustox and one area each of Kandiudox, Kandiudult and Paleudult. These soils have low to medium fertility. Thier agriculture limitation encompasses being acidic, insufficient available phosphorus and potassium. Their agricultural land use needs nutrient management with proper crop type selection. Nevertheless, for soils occupying sloping areas, proper soil and water conservation management is needed to maintain general environment for sustainable land use.
显示更多 [+] 显示较少 [-]