Soil science [Response of sesame (Sesamum indicum) to levels and application methods of nitrogen; effect of kenaf shivers mulch on raingrown sorghum (S. vulgare), yield of two groundnut (Arachis hypogaea) varieties; effect of late nitrogen application on groundnut yields; effect of mulch and phosphate fertilizer on groundnuts under rain. Five trials conducted at Kenana, Sudan]

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