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Integrated nutrient management for sustainable cassava production in South Western Nigeria

Due to cost, availability and technical reasons, agriculture with high chemical fertilizer input has not been practiced in Nigeria. Animal manures are not available in the required quantities and are often low in one or more of the major nutrients: N, P, and K. This study investigated the effect of an integrated use of organic manures and inorganic fertilizer on cassava production and soil parameters. Single applications of manures and an inorganic fertilizer at recommended rates served as references. Crop responses were highest with integration of manures with no productivity gaps when compared with the rates of single applications of the recommended inorganic fertilizer and manures. Nutrients were made most available when manures were integrated with inorganic fertilizer. Root yield was highest with the integrated use of manures and fertilizer while stem yield was highest with the single applications of manure. Lowest responses were obtained in the control treatment without fertilization for all parameters. Crop and soil productivity can be sustained with the integration of different manures as a viable alternative to the single applications of either manure or inorganic fertilizer.