Contextual Match-making In Waste Biomaterials Management For Peri-urban Agriculture

Abstract

Peri-urban agriculture is constrained by inadequate space and insufficient inputs. The objective of this paper was to estimate volumes of peri-urban agriculture waste materials generated and match it with identified users who need them in Kampala City (Uganda) as either animal feeds or manure. The mass of manure from animals and the crop residues generated were determined using the standard manure potential of animals and crop to residue (C:R) ratio methods respectively. The required baseline number of animals and crops grown in Kampala was obtained from secondary data. Of the 263,449 livestock animals in Kampala, a potential of 11,499 Mt of manure can be generated that can sustain 858 farmers each occupying 0.4 ha of land and using 13.33 Mt of manure each on their field. This manure when used as fertilizers for the common crops grown in Kampala (Maize, Bananas and Beans), it can meet nutrient requirements of 135 ha of maize or 99 ha of Bananas or 132 ha of beans. The potential crop residues from the major crops amount to 4,162 Mt and can meet nutrient requirements of 20,033 broiler chickens or 18,117 beef cattle or 18,237 pigs annually. Utilizing the bio wastes generated in Kampala as agriculture inputs can therefore be a remedy to the high costs of fertilizers and animal feeds as well as protecting the environment against gaseous emissions resulting from the poor disposal of these wastes