RT null T1 Organic Input Management in Africa: Current Knowledge and Challenges A2 Opala, Peter K1 organic farming K1 nutrient balance K1 Africa YR 2024 FD 2024-06 LK https://wedocs.unep.org/handle/20.500.11822/45941 UL https://wedocs.unep.org/handle/20.500.11822/45941 DS UN Environment Document Repository RD Sep 16, 2026