Application of Municipal Solid Waste Compost and Green Manure Exerted Residual Effects on Soil Nutrient Content and Plant Nutrient Uptake in Rice

Abstract

Aims: Rice is the most widely consumed staple food as well as Bangladesh. With the global upsurge in population, rapid urbanization, and industrialization increasing waste production in urban areas and managing them becoming a major concern. Municipal solid waste (MSW) is considered an important recycling tool for use in agricultural fields as compost. Green manure (GM) is another thing thatprovides a substantial portion of the nitrogen requirement of rice. Both MSW compost and GM add organic matter to the soil. We conducted a study to know the residual effects of municipal solid waste (MSW) compost and green manure (GM) on nutrient contents in soil and uptakes in rice (BINA Dhan-7). Methods: The experiment was conducted with a Randomized Complete Block Design (RCBD), nine treatments, and three replications. The present rice crop received no fertilizers during the cultivation period. MSW compost and GM inoculated with Rhizobium strains were incorporated as per treatments in 2 cycles of the Mungbean- Dhaincha- Rice cropping pattern. Results: The highest nutrient content and uptake were recorded with higher rates of MSW compost and GM application in the preceding crops. Compost is a slow-release source of nitrogen and most nitrogen remaining after completion of the composting process is bound into organic forms. After application nutrients do not become available immediately for plant uptake, and remain as residue which contributes to improving soil quality for several years after application ceases. MSW compost and GM increases soil nutrient contents, availability, and uptake by adding organic matter, increasing the C: N ratio, and soil’s physical, chemical, and biological properties. Conclusion: The MSW compost and GM can provide a significant amount of residual effects on the nutrient content in the soil and uptake in rice which depends on the nutrient composition of applied manure in previous crops.