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International Journal of Soil Science
Year: 2008  |  Volume: 3  |  Issue: 2  |  Page No.: 69 - 74

Effects of Tithonia Green Manure and Water Hyacinth Compost Application on Nutrient Depleted Soil in South-Western Nigeria

K.S. Chukwuka and O.E. Omotayo    

Abstract: The study was conducted to investigate the application effects of Tithonia diversifolia (Hemsley) A. Gray) green manure and water hyacinth [(Eichhornia crassipes) Mart) Solms] compost on nutrient depleted soil from under an alley cropping system. The study was carried out at the Botany and Microbiology Department, University of Ibadan. Three different soil amendment treatments including control were used in the study. These were applied in sole applications as well as in varying combinations of the different treatments. The organic amendment treatments were compared to natural fallow as unfertilized control in a modified screen house experiment replicated 3 times in a Completely Randomized Design (CRD). The results showed that the application of 250 t ha-1 of fresh organic amendments increased the soil N, P, K, Ca, Mg, Cu, Zn, Mn, Fe, nitrate and nitrite compounds, pH and organic C of treated soils (both top and sub soil samples). Varying application rates of 187.5 and 62.5 t ha-1 also showed increased nutrient status for all aforementioned nutrient elements relative to the control treatment. Combination of Tithonia green manure and water hyacinth compost in the ratio (0.25:0.75 kg) was the most effective in increasing soil nutrient status of all treatments applied. The significance of increase in soil nutrient status of amended soils indicates that local farmers can gainfully substitute use of more expensive chemical fertilizers with these more readily available organic amendment resources.

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