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International Journal of Soil Science
Year: 2007  |  Volume: 2  |  Issue: 3  |  Page No.: 171 - 181

Effects of Sewage Sludge Application on Rice Growth, Soil Properties, and N Fate in Low Fertile Paddy Soil

Naomi Asagi, Hideto Ueno and Azza Ebid    

Abstract: The effects of the application of sewage sludge (SS) on the growth indices, yield and nutrient uptake in rice (Oryza sativa L. cv. Koshihikari) grown in a low fertility soil were investigated and were compared with the effects of the application of chemical fertilizer (CF) and no fertilizer (NF). The application of SS increased plant growth indices in comparison with the NF treatment; however, at harvest, the dry weight of the plants grown in the SS-treated soil was 30% lower than that of plants in the CF-treated soil. The amounts of N uptake by rice from CF, SS and the soil were determined using the A value method. The amounts of N uptake from the fertilizer and soil in the CF treatment were 0.137 and 0.054 g pot-1, respectively and those in the SS treatment were 0.130 and 0.017 g pot-1, respectively. The N use efficiencies of the plants in the CF- and SS-treated soils were 68.3 and 43.0%, respectively. Therefore, the relative efficiency of SS to CF was 62.9%. In comparison to the NF and CF treatments, the application of SS increased the soil microbial activity; this was determined by assaying the fluorescein diacetate esterase activity. At harvest, the pH of the SS-treated soil was higher than that of the soils in the NF and CF treatments and the electrical conductivity (EC) of the CF-treated soil was higher than that of the soils in the NF and SS treatments.

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