THE RELATIONSHIP OF CLAY PARTICLES WITH ORGANIC MATTER FROM THE DECOMPOSITION OF GREEN MANURE CROP (JACK BEAN) ON PADDY FIELD IN NORTHEAST OF THAILAND

Abstract

Green manure is an organic fertilizer that is derived from to plow the plants still fresh in the soil while the plant is fully grown or in the flowering period. The most popular green manure crops are the jack bean, cowpea and sunn hemp, etc. The green manure, it consists part of rapid and slow decomposition. Biodegradable part sooner will be the nitrogen source for the plant to grow. Cellulose, hemi-cellulose and lignin are slow to decompose about 20% of the plant material will add organic matter to the soil. Based on previous research, it is found that increasing the organic matter in the soil to make the soil particle dispersion, soil water uptake and soil nutrient uptake is good. However, due to the organic matter, it decomposes faster in tropical climates. It is a source of nutrients in the soil in a short time. It was also found that clay particles were more resistant to degradation than organic matter and could extend the life of the organic matter in soil, thus slowing the decomposition of organic matter. For this reason, the study of the relationship between clay particles and organic matter in soils is important.