Survey on soil productivity of soybean growing areas in some Northern provinces [Thailand]
1992
Chalood Tharathabhand | Wiroj Wajananawat | Suphat Wankhrua (Chiang Mai Field Crops Research Center (Thailand))
Survey on the soil productivity and the limiting facters concerned of soybean growing areas in the North was made both in irrigated and rainfed areas since 1985-1989 by Semi - Structural interview. The major problems of soil in irrigated areas are not in critical condition. The limiting factors concerned mostly are the low content of soil phosphorus availability, low pH, poor drainage of some soils, and inefficient use of chemical fertilizer on cultivated land without land preparation which should be seriously advicing especially, the farmers have been ignored on soil productivity improvement and sustaining for rice - soybean system. The use of ground rock phosphate and returning the organic matter into the farm land such as rice straw, and soybean stubble waste after threshing must be strangly recommended. The evident soil productivity limitation in rainfed areas are concerning soil texture themselves where mostly are sandy loam to sandy soil which high run off and erosion in the rainy season. It depends mainly to some specific location where the topography of lands are rolling and sloping. Besides, the influence of precipitation and the uneven of distribution are seriously affected on growth and yield of soybean. It is uncontrolling factor but the farmers can overcome those problems by maintaining soil organic material and using some soil amendments and eventhough growing some early season cropping such as mungbean (Vigna radiata) before main crop or/and growing covered crop such as Dolichos lab etc. after soybean harvesting where soil remain moisture and these covered crops can be turned under in the early rainy season.
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