The uses and application of Fertilizer by Nigerian Farmer has been in improper, especially Isuikwuato Local Government Area, Isuikwuato, Abia State of Nigeria. Fourteen Farmers from Isuikwuato Local Government Area, Isuikwuato, Abia State of Nigeria participated in the study. Two groups of Farmers were chosen thus: the first group as subsistence farmers group and the second medium scale farmers. The Farmers� interest and knowledge level were assessed through pre and post tests items designed by the researchers which were subsequently reviewed by three experts for reliability. To ascertain reliability of the survey and test items materials, Cronbach�s alpha reliability coefficient was computed for the pre and post-survey of each group. The subsistence farmers group had a reliability coefficient of 0.75 and 0.89 for the pre and post-survey respectively. The medium scale farmers group had a reliability coefficient of 0.82 and 0.91 for the pre and post-survey respectively. A reliability coefficient of 0.7 or greater is considered to be reliable; hence the reliability of the survey�s results. There was a significant gain in Farmers� knowledge of uses and application of fertilizers but not in interest. The uses and applications of fertilizers concepts were clearly displayed, while common errors were often related to lack of appropriate skills. The Farmers� understanding of the uses and application of Fertilizer improved and this was discussed in the context of several existing theories of learning.
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