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acres adopters African Agricultural Development Project agricultural sector Akpan Americo-Liberians Bong County Bong Project cash crops cassava Central Agricultural Research chiefdoms cocoa coffee colonial cooperatives County Agricultural Development Cuttington University College district economy effort established export extension aides factors farming systems fertilizer Firestone Gbarnga harvest hired labor household HYVs important improved swamp rice income increase indigenous initial innovations inputs INSTRUPA intercropped Kellemu Kokoyah Kpelle society land Liberia lineage Lofa County major Ministry of Agriculture Monrovia Nimba County obtain participation peasant peasantry percent plantations planting Policy political population Poro problems Project area purchase rice farm role rubber schistosomiasis season settlers Sierra Leone slave social soils Suacoco subsistence farmers swamp farming swamp rice production swamp rice technology Table Total traditional swamp traditional system tribal upland farm upland rice production Upper Bong varieties vegetables village weeding women yields Zota