[Soil management in sustainable agriculture]
1992
Tawachai Na-nagara (Department of Agriculture, Bangkok (Thailand). Soil Science Div. Soil Physics Research Group)
Sustainable agriculture should involve the successful management of resources for agriculture to satisfy changing human needs while maintaining or enhancing the natural resource base and avoiding environmental degradation. Thailand's agriculture can be characterized by a rainfed traditional production systems. More than 80 % of total cultivated land area has been under cropping risk due to drought hazards. Despite continuous cropping for generations, fertilizers and appropriate conservation measures have seldom been used by the farmers. Consequently, there has been a reduction of crop yields due to mineral stress, water stress and erosion hazard. These three major soil constraints and their importance in the agricultural development are outlined. Methods of improvement with emphasis placed on low input technology and sustainable crop production are reviewed. To obtain a clear picture for potentials for increased production, land use and soils of Thailand are also described.
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