Relationships between organic matter and some chemical properties of sandy soils with different landuse and soil management
1991
Patma Vityakon (Khon Kaen Univ. (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Bringing forest land to cultivation has brought about a rapid decline in soil fertility. Different land uses and soil managements have resulted in the fertility decline or increase to different degrees. The objectives of this study were to investigate effects of landuse and soil management on organic matter content and fertility of sandy soils and to determine relationships of soil organic matter with nutrient status and with some other soil chemical properties namely pH, CEC and soil acidity. Study methods included sampling of sandy soils of Great Groups Paleustults, Paleaquults and Quartzipsamments which had different landuses including forest, agroforestry, paddy rice, vegetable, pasture, and upland crops. Total of 26 soil samples were collected from two horizons: A and B (or immediately below the horizon which had relatively higher organic matter). Chemical property indicators of soil fertility including organic matter, pH, CEC, concentrations of various nutrients, exchangeable Al and total exchangeable acidity were determined. Landuse and soil management affected soil organic matter content and fertility significantly. Soils under landuse systems with frequent return of organic matter, such as forest soils or those which frequently received organic matter amendments had higher organic matter, CEC, and nutrient (N, P, K, and Mg) than soils under systems with less organic matter return. Organic matter content had high and significant correlation with CEC. CEC increased 7 me/100 g every 1 % increase of organic matter. However, relationship between landuse and soil management and that of organic matter with exchangeable Al and total exchangeable acidity were not found in this study.
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