Nitrogen, phosphorus and sulphur mineralization in soil treated with amended municipal solid waste compost under aerobic and anaerobic conditions

Purpose Our study had considered some organic amendments to enhance nutrient level of marketed municipal solid waste (MSW) compost for its potential use as fertilizer for growing crops in alluvial soils. Method We prepared three types of amended compost by mixing ۲۰% mustard oil cake (MOC), and ۳۰% poultry manure (PM) or cowdung (CD) or sugarcane press mud (SPM) with ۵۰% MSW compost. The nitrogen (N), phosphorus (P) and sulphur (S) mineralization study was done in soil treated with three amended and one unamended composts with three replications through an incubation experiment at a temperature of ۲۵ ± ۱°C for ۸۲ days under aerobic (field capacity) and anaerobic (submerged) conditions. The mineralization data were fitted to the first-order kinetic model. Results The soil NO۳--N content was ۲-۳ times higher in aerobic condition than in anaerobic condition, while the NH۴+-N was higher in anaerobic soils. The kinetic model reveals that poultry manure and sugarcane press mud had higher capability to supply N for use by the crops. The P release was the highest at day ۱۵ with three-time higher availability in anaerobic condition. The S mineralization in soil was higher in field capacity than in submerged condition. ConclusionThe compost mixture comprising MSW, MOC and SPM in a ratio of ۵:۲:۳ demonstrated the highest cumulative N, P and S mineralization in both aerobic and anaerobic conditions. The N and S availability decreased while the P availability increased in submerged soils which result has fertilizer management implications for wet  land rice crop.  

کلیدواژه ها:

Kinetic Model ، N mineralization ، P mineralization ، S mineralization ، MSW compost ، Submerged soils