EVALUATION OF THE MACRO-NUTRIENT STATUS OF THE CURRENT FIELD PRACTICAL TRAINING (305) EXPERIMENTAL FARMSITE,
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ABSTRACT
The current 305 Field Practical Training Farm site of the Faculty of Agriculture, University of Benin (Ugbowo), Benin City, Edo state in Nigeria was selected for the study. It has been used for cropping (sole and intercropping) over 12 years were analyzed chemically for the evaluation of basic soil parameters viz., pH, EC, OC and macronutrients such as N, P,K and S by using standard methods. Five locations were selected and five different composite samples for the five locations (0-15cm) each were taken and bulked into five. These were further analyzed for chemical properties and available N, P, K and S status. Results revealed that the soil was low in nutrient when compared to critical levels The Organic carbon, available N, Ca and K were low while the P content was high. The available S was quite high ranging from 5.88-10.47mg/kg.
pH values were acidic within the range (4.6-5.6) while organic carbon percentage ranged from 1.02-1.57% in surface soils and increased with increasing depth. The Electrical Conductivity (EC) level ranged from 48.70-208g/kg. The concentration of the exchangeable cations were all in a decreasing order of magnitude; Ca++ >Mg++>Na+>K+. The percentage Base Saturation were generally low and rarely exceeding 28%. Available phosphorus ranged from 1.55-20.20mg/kg. Total Nitrogen 0.02-0.09% while exchange-acidity ranged from 0.05-1.00Cmol/kg. However, adequate measures are required to enrich the status of the top soil to increase productivity.
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