EFFECT OF GREEN MANURING TO RESTORE THE SOIL FERTILITY AND PRODUCTIVITY

A Green House study was conducted during rice-wheat cropping system at Katiarchar, Kishoreganj sadar upazila of Kishoreganj district in 2012. It was set up in the CEGIS research station which is situated at Kishoreganj. The microbial population and its biomass and nitrogenase activity in plant roots under silty-clay-loam soil conditions where the plant residues of Sesbania aculeata were incorporated were significantly higher than that obtained from summer fallow. The increases in yield of wheat and the total nitrogen content in shoot and grain was also perceptible by the application of green manuring. The result highlights the importance of green manuring practices under silty-clay-loam soil conditions of Bangladesh. As compared to fallow Sesbania aculeata increased the population of bacteria, actinimycetes, fungi, Azospirillum, Azotobacter and PSB by 2.3, 3.7, 5.0, 3.2,  and 5.3  times, respectively during rice growth period and 1.7, 12.0, 1.7, 2.3, and 2.0 times, respectively during wheat growth period. Results revealed that, green manuring incorporation enhance the soil fertility and productivity of both rice and wheat.