technology in vegetable production in Osun State of Nigeria

The fragility and high susceptibility of the soils in Nigeria to degradation and loss of nutrients make augmentation through the use of fertilizers necessary to obtain reasonable crop yield. The use of market oriented organic fertilizer is being encouraged to improve soil fertility and there is the need to determine the economic rationale of this technology. This study determined the change in net income of users of commercial organic fertilizer (UCOF) relative to non-users of fertilizers (NUF) in vegetable crop production in Osun State of Nigeria to fi nd out if its use should be encouraged based on economic reason only. Nested sampling technique was used in selecting UCOF and NUF respondents. Data on yield, quantities and prices of inputs and output; and reasons for non-use of commercial organic fertilizer were collected and analyzed using descriptive and inferential statistics, partial budgetary technique, sensitivity analysis and importance ranking. Analyses indicated that UCOF applied 610kg ha-1 of commercial organic fertilizer resulting in additional yield (3,375kg ha-1) and rate of returns (401%) over and above the NUF, making the use of organic fertilizer technology economically superior to non-use of fertilizers. Constraints to the use of commercial organic fertilizer are doubtful effi cacy, offensive odour, heavy weed infestation, bulkiness and lack of funds in descending order of importance which if eliminated will boost demand for commercial organic fertilizer and improve production of vegetable for consumption. Key words: Vegetable, commercial organic fertilizer, marginal rate of return, constraints, Osun State, Nigeria 2000). DFID (2002) stated that environmental degradation ca