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Nigerian Journal of Soil Science -- Vol. 16 (2006): comparative study of Ogun phosphate rock and single super phosphate on three varieties of cowpea and maize and their effect on soil | 27 USD |
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Nigerian Journal of Soil Science -- Vol. 16 (2006): Evaluation of gravel concentration and soil strength in upland rice cultivation in Abeokuta, Southwestern Nigeria | 27 USD |
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| Total: 54 USD | |||
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