Perilaku Sifat Fisika Tanah yang Berasal dari Sedimen Berpirit dari Musi Banyuasin Sebagai Pengaruh Perlakuan Pengeringan

Abstract

Greenhouse and laboratory research at the Department of Soil Science, Faculty of Agriculture IPS has been conducted about treatment of drying on acid sulphate soil coloum from Musi Banyuasin to examine the effect on soil physical properties. Soil coloum of 95 em height is main~ained submerged, aside from other soil coloums drained at 50 cm and 75 em depth are drying treatment of 2,4,6, and 8 weeks. Drying treatment at 75 em depth lowering soil surface 0.8 and 2.9 em at the first and eighth week of drying, respectively. The soil subsidence is affected by organic matter decomposition and swelling - shrinkage characteristic of 2:1 clay mineral. Drying treatment Significantly increasing aggregate stability from 54.69 to 57.19 at 15 cm depth, decreasing it from 57.29 to 51.19 at 45 em depth at sixth week, and 49.59 to 45.82 at 75 em depth at fourth week. Although the result has irregular pattern, drying treatment significantly increasing soil bulk density at 15 em depth from 0.83 to 0.95 g/em3 , decreasing at 45 em depth from 0.69 to 0.45 g/em3at sixth week, and increasing from 0.63 to 0.72 g/em3 at 75 em depth at fourth week. The incremental and decreasing is more caused by organic matter decomposition and soil aggregate sementation by iron resulted from pyrite oxidation. Drying treatment significantly affecting soil porosity, permeability and COLE at several depth, although the pattern is irregular. Kata kunci : acid sulpahte soils, organic matter decomposition, swelling-shrinkage of 2:1 clay mineral, pyrite oxydation