EVALUATION OF MUNICIPAL WASTE SOIL AND APPLICATION OF NPK FERTILIZER ON THE GROWTH AND YIELD OF OKRA AND GARDEN EGG
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Abstract
The present study evaluated the physical, chemical, and heavy metals content (Fe, Zn, Mn, and Cu) and fertility status of soils from three dumpsites within the Benin city metropolis and the effect of NPK (15:15:15) fertilizer on the growth and yield of Okra and Garden Egg. Soils samples were collected processed and analyzed using standard laboratory methods. The experiment was a 3 x 4 factorial fitted in a Completely Randomized Design (CRD), with three levels of fertilizer (0 g NPK, 14 g NPK and 28 g NPK) and (3) dumpsites (Benin Sapele Road Dumpsite (BSD), Benin Agbor Road Dumpsite (BAD) and Benin Oluku Bypass Dumpsite
(BOD) and the control with three replications. Growth parameters (plant height, number of leaves; stem girth; leaf area) and yield were collected. The fruit yield per hectare was derived by estimating the fruit yield per poly bag. Data were subjected to Analysis of Variance (ANOVA), and treatment means were separated using Duncan’s Multiple Range Test at 5% probability level. Results showed that, physical and chemical properties of the dumpsite soils were slightly alkaline with pH range of 7.28 to 7.56. The organic carbon ranged between 11.6 and 13.7 g/kg. The fertility status of the soils from the different dumpsites revealed that soils
from Agbor Road ByePass were high in potassium while soils from Oluku and Sapele ByePass dumpsites were high in phosphorus and nitrogen. The total N from the dumpsites ranged between 0.065 to 0.199 %. The heavy metal content of dumpsite soils varied significantly, but was within the limits recommended by FAO/WHO. The application of 28 g NPK fertilizer enhanced the growth and yield of Okra and Garden Egg compared to the control. This study suggest that dumpsite soils amended with NPK fertilizer improved soil nutrients status and enhanced the yield and growth of Okra and Garden Egg plant.
(BOD) and the control with three replications. Growth parameters (plant height, number of leaves; stem girth; leaf area) and yield were collected. The fruit yield per hectare was derived by estimating the fruit yield per poly bag. Data were subjected to Analysis of Variance (ANOVA), and treatment means were separated using Duncan’s Multiple Range Test at 5% probability level. Results showed that, physical and chemical properties of the dumpsite soils were slightly alkaline with pH range of 7.28 to 7.56. The organic carbon ranged between 11.6 and 13.7 g/kg. The fertility status of the soils from the different dumpsites revealed that soils
from Agbor Road ByePass were high in potassium while soils from Oluku and Sapele ByePass dumpsites were high in phosphorus and nitrogen. The total N from the dumpsites ranged between 0.065 to 0.199 %. The heavy metal content of dumpsite soils varied significantly, but was within the limits recommended by FAO/WHO. The application of 28 g NPK fertilizer enhanced the growth and yield of Okra and Garden Egg compared to the control. This study suggest that dumpsite soils amended with NPK fertilizer improved soil nutrients status and enhanced the yield and growth of Okra and Garden Egg plant.
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