Elevated price of chemical fertilizers and poor nutrient content in conventional organic sources such as municipal solid waste(MSW)compost necessitate the production of nutrient enriched compost which could serve as a...Elevated price of chemical fertilizers and poor nutrient content in conventional organic sources such as municipal solid waste(MSW)compost necessitate the production of nutrient enriched compost which could serve as a potential alternative organic fertilizer option.We studied three types of amended compost that were prepared by mixing 20%mustard oil cake(MOC)and 30%poultry manure(PM)or cow dung or sugarcane press mud(SPM)with 50%MSW compost.Trichoderma viride was inoculated into every type of compost.The rate of amended or unamended MSW compost application was 10 t ha^(−1).The use of different amendments improved the nutrient level of MSW compost,of which the N increment was remarkable,ranging from 1.14%N(unamended compost)to 2.9%–3.22%N depending on the types of amendment.A field experiment was conducted to evaluate performances of the amended MSW composts on the yield and nutrient content of potato(variety BARI Alu25).All compost treatments except the sole MSW compost treatment produced significantly higher tuber yields than the sole fertilizer treatment.The press mud based MSW compost+fertilizer treatment produced the highest tuber yield of 31.6 t ha^(−1)(65%increase over 100%fertilizers and 57%increase over 100%compost treatment).The tuber N concentration varied from 0.128%to 0.594%,P from 0.018%to 0.035%,K from 0.213%to 0.313%and S from 0.020%to 0.053%,with the highest result recorded with press mud+fertilizer treatment.The use of amended composts had residual effects on soil N,P,K and S contents.Thus,the treatment containing 50%fertilizer+50%compost mixture(MSW:MOC:SPM in a ratio of 5:2:3)performed the best followed by PM amended compost.It is concluded that integrated use of 10 t ha^(−1) organic amended MSW compost with chemical fertilizers can ensure higher crop yield,nutrient content and sustained soil fertility in nutrient-deficient sub-tropical soil.展开更多
The effect of vermicomposting on kinetic behavior of the products is not well recognized. An incubation study was conducted to investigate C mineralization kinetics of cow manure, sugarcane filter cake and their vermi...The effect of vermicomposting on kinetic behavior of the products is not well recognized. An incubation study was conducted to investigate C mineralization kinetics of cow manure, sugarcane filter cake and their vermicomposts. Two different soils were treated with the four solid wastes at a rate of 0.5 g solid waste C per kg soil with three replications. Soils were incubated for 56 d. The CO2-C respired was monitored periodically and a first-order kinetic model was used to calculate the kinetic pa-rameters of C mineralization. Results indicated that the percentage of C mineralized during the incubation period ranged from 31.9% to 41.8% and 55.9% to 73.4% in the calcareous and acidic soils, respectively. The potentially mineralizable C (C0) of the treated soils was lower in the solid waste composts compared to their starting materials. Overall, it can be concluded that de-composable fraction of solid wastes has decreased due to vermicomposting.展开更多
基金supported by the World Bank(WB)funded Higher Education Quality Enhancement Project(HEQEP)implemented by the University Grants Commission(UGC),Bangladesh.
文摘Elevated price of chemical fertilizers and poor nutrient content in conventional organic sources such as municipal solid waste(MSW)compost necessitate the production of nutrient enriched compost which could serve as a potential alternative organic fertilizer option.We studied three types of amended compost that were prepared by mixing 20%mustard oil cake(MOC)and 30%poultry manure(PM)or cow dung or sugarcane press mud(SPM)with 50%MSW compost.Trichoderma viride was inoculated into every type of compost.The rate of amended or unamended MSW compost application was 10 t ha^(−1).The use of different amendments improved the nutrient level of MSW compost,of which the N increment was remarkable,ranging from 1.14%N(unamended compost)to 2.9%–3.22%N depending on the types of amendment.A field experiment was conducted to evaluate performances of the amended MSW composts on the yield and nutrient content of potato(variety BARI Alu25).All compost treatments except the sole MSW compost treatment produced significantly higher tuber yields than the sole fertilizer treatment.The press mud based MSW compost+fertilizer treatment produced the highest tuber yield of 31.6 t ha^(−1)(65%increase over 100%fertilizers and 57%increase over 100%compost treatment).The tuber N concentration varied from 0.128%to 0.594%,P from 0.018%to 0.035%,K from 0.213%to 0.313%and S from 0.020%to 0.053%,with the highest result recorded with press mud+fertilizer treatment.The use of amended composts had residual effects on soil N,P,K and S contents.Thus,the treatment containing 50%fertilizer+50%compost mixture(MSW:MOC:SPM in a ratio of 5:2:3)performed the best followed by PM amended compost.It is concluded that integrated use of 10 t ha^(−1) organic amended MSW compost with chemical fertilizers can ensure higher crop yield,nutrient content and sustained soil fertility in nutrient-deficient sub-tropical soil.
基金Project (No. 1385) supported by the Isfahan University of Tech-nology, Iran
文摘The effect of vermicomposting on kinetic behavior of the products is not well recognized. An incubation study was conducted to investigate C mineralization kinetics of cow manure, sugarcane filter cake and their vermicomposts. Two different soils were treated with the four solid wastes at a rate of 0.5 g solid waste C per kg soil with three replications. Soils were incubated for 56 d. The CO2-C respired was monitored periodically and a first-order kinetic model was used to calculate the kinetic pa-rameters of C mineralization. Results indicated that the percentage of C mineralized during the incubation period ranged from 31.9% to 41.8% and 55.9% to 73.4% in the calcareous and acidic soils, respectively. The potentially mineralizable C (C0) of the treated soils was lower in the solid waste composts compared to their starting materials. Overall, it can be concluded that de-composable fraction of solid wastes has decreased due to vermicomposting.
