1. Abdulahi, A., Lombin., G., 1978. Long-term Fertility Studies at Samaru-Nigeria: Comparative Effectiveness of Separate and Combined Applications of Mineralizers and Farmyard Manure in Maintaining Soil Productivity Under Continuous Cultivation in the Savanna, Samaru, Samaru Miscellaneous Publication. No. 75, Ahmadu Bello University, Zaria, Nigeria.
2. Decomposition of 14C labelled glucose and legume material in soils: properties influencing the accumulation of organic residue-C and microbial biomass-C;Amato;Soil Biology and Biochemistry,1992
3. ARC (Agricultural Research Council), 1980. The Nutrient Requirements of Ruminant Livestock. Farnham Royal, Slough, Commonwealth Agricultural Bureaux, U.K.
4. Long-term effects of fertilizer and manures on soil and leaves of cotton in Nigeria;Bache;Experimental Agriculture,1969
5. An economic evaluation of a long-term experiment on phosphorus and manure amendments to sandy Sahelian soils: using a stochastic dominance model;Baidu-Forson;Fertilizer Research,1992