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EXPLORING THE RECYCLING OF MANURE FROM URBAN LIVESTOCK FARMS:A CASE STUDY IN ETHIOPIA

Frontiers of Agricultural Science and Engineering 2021年第1期8卷 159-174页

作者： Solomon Tulu TADESSE Oene OENEMA Christy van BEEK fikre lemessa ocho Department of Horticulture and Plant Sciences College of Agriculture and Veterinary MedicineJimma UniversityJimmaEthiopia Department of Soil Quality Wageningen University and Research6700 AA Wageningenthe Netherlands Wageningen Environmental Research 6700 AA Wageningenthe Netherlands SoilCares Foundation Nieuwe Kanaal 7c6709 PA Wageningenthe Netherlands

Urban population growth is driving the expansion of urban and peri-urban agriculture(UPA)in developing *** is providing nutritious food to residents but the manures produced by UPA livestock farms and other wastes are not properly *** paper explores the effects of four scenarios:(1)a reference scenario(business as usual),(2)increased urbanization,(3)UPA intensification,and(4)improved technology,on food-protein self-sufficiency,manure nitrogen(N)recycling and balances for four different zones in a small city(Jimma)in Ethiopia during the period *** N mass flow model with data from farm surveys,field experiments and literature was used.A field experiment was conducted and N use efficiency and N fertilizer replacement values differed among the five types of composts derived from urban livestock manures and kitchen *** N use efficiency and N fertilizer replacement values were used in the N mass flow *** manures were the main organic wastes in urban areas,although only 20 to 40%of animal-sourced food consumed was produced in UPA,and only 14 to 19%of protein intake by residents was *** indicate that manure production in UPA will increase 3 to 10 times between 2015 and 2050,depending on urbanization and UPA *** 13 to 38%of manure N will be recycled in ***-gate N balances of UPA livestock farms will increase to>1 t·ha−1 in *** livestock productivity and feed protein conversion to animal-sourced food will roughly halve manure N *** of waste recycling were high and indicate the need for government *** of these senarios are wake-up calls for all stakeholders and indicate alternative pathways.

关键词： compost food self-sufficiency livestock production nitrogen balance nitrogen use efficiency scenario analysis

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