Chemical degradation status of soils in Khun Wang area, Chiang Mai province | สถานภาพการเสื่อมโทรมทางเคมีของดินในพื้นที่ขุนวาง จังหวัดเชียงใหม่
2009
Nakarin Sobprasonk(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) | Somchai Anusontpornperm(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) | Irb Kheoruenromne(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science) | Anchalee Suddhiprakarn(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Soil Science)
Study on chemical degradation status of soils in Khun Wang area was conducted on 16 areas by comparing their chemical properties. It was aimed at assessing soil chemical changes which might indicate degradation due to converting native forests into agricultural areas. Results revealed that soil pH in native forest areas was slightly lower than in areas used for agricultural production. All soils were acidic with pH ranging from 4.1-6.0. Soil organic matter content was very high in forest areas (42.2-69.7 g/kg) and in most areas under crop practices. Amounts of available P were extremely high in the topsoils of agricultural areas (49-643 mg/kg) comparing to the fairly low quantity in forest lands and in paddy rice fields. Potassium availability in surface layers of all soils was similarly high. Base saturation percentage of most soils was lower than 35. Soil fertility assessment indicated that current agricultural practices rarely caused discernable soil degradation when compared to soils under native forests nearby. This could severally be attributed to farmer's suitable conservation and management practices in the areas. However, there was a slight concern with over-use of P and K fertilizers that left high residual amounts of both plant nutrients, especially in soils under greenhouse. This may subsequently craft plant nutrient imbalance in the soils.
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