Effect of the raw materials and mixing ratio of composted wastes on the dynamic of organic matter stabilization and nitrogen availability in composts of Sub-Saharan Africa.
The effect of raw materials and their proportions in initial mixtures on organic matter (OM) stabilization and nitrogen (N) availability during pit composting in Sub-Saharan Africa was assessed using biochemical fractionation and laboratory incubations to characterize composts sampled throughout the composting process. Stabilization of OM occurred more rapidly in mixtures with slaughter-house wastes, it was progressive in mixture with household refuses while tree leaves compost remained unstable. Carbon mineralization from compost samples was positively correlated to water soluble and hemicellulose-like organic fractions. Mixtures containing large proportions of household refuses reached the highest stability and total N but available N remained weak. Slaughter-house wastes in the initial mixtures made possible to reach good OM stabilization and the largest N availability. The nature of initial mixing influenced composting parameters, OM stabilization and N availability. It is suggested mixing household refuses and slaughter-house wastes with tree leaves to reach better amending and fertilizer qualities of composts.
Université de Ouagadougou, UFR/SVT, 03 BP7021 Ouagadougou 03, Burkina Faso.
Théodore Wind-Tinbnoma
TW
Kaboré
Sabine
S
Houot
Edmond
E
Hien
Prosper
P
Zombré
Victor
V
Hien
Dominique
D
Masse
D017954:Africa South of the Sahara; D001673:Biodegradation, Environmental; D001937:Brassica; D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D018552:Daucus carota; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D008460:Meat; D009584:Nitrogen / Q000737:chemistry*; D025341:Principal Component Analysis; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil; D013997:Time Factors
D005308:Fertilizers; D007220:Industrial Waste; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon; D002482:Cellulose; D009584:Nitrogen