Agronomy and plant physiology. Long term experiments: [in Sudan: four-course rain rotations; continuous monocropping fertilizer experiment under rain; rain two course rotation versus monocropping; dwarf sorghum (S. vulgare Pers.); sesame (Sesamum indicum); groundnuts (Arachis hypogaea); maize (Z. mays); kenaf (Hibiscus cannabinus)]

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