Changes in soil organic matter pools and fractionation of humic substances in soils of long-term nutrient management

抄録

The changes in soil organic matter due to long-term manuring were conducted the experiments at the Bangabandhu Sheikh Mujibur Rahman Agricultural University research farm, Gazipur. Soil samples from long-term field experiment were collected (after 16 years) to study the changes in soil organic matter pools and fractionation of humic substances in soils. The application of organic residues and green manuring increased humin, humic and fulvic acid carbon, total and water soluble organic carbon of soil. The effect of organic materials on different carbon fractions was found up to 45 cm soil depths. Total nitrogen of soil was increased significantly with the application of organic manures. Nitrogen application increased not only increased soil nitrogen but also soil carbon.