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Effect of Nitrification Inhibition on Soil Phosphate Release and Nutrient Absorption and Growth of Rice Plant
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 Title & Authors
Effect of Nitrification Inhibition on Soil Phosphate Release and Nutrient Absorption and Growth of Rice Plant
Chung, Jong-Bae; Kim, Byoung-Ho;
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In a pot experiment, we studied the effect of nitrification inhibition on Fe reduction and P release in paddy soil and growth and nutrient uptake of rice plant. Recommended level of fertilizers, 6 kg N, 5 kg and 4 kg per 10a, were applied, and for N fertilizer urea, urea+N-serve, and were included. Four 30-day-old seedlings were transplanted in a waterlogged 9 L pot filled with Yuga series soil, and 3 pots were prepared in each N fertilizer treatment. Changes of soil redox potential and concentration of , , and in soil solution at 10 cm depth were monitored, and also the growth and nutrient uptake of rice plants were measured. Concentration of in soil solution was highest in urea+N-serve treatment, and followed by urea and treatments. Addition of N-serve could effectively inhibit nitrification in the soil. In the treatment of , relatively higher concentration was found at 10 cm depth soil. In urea+N-serve treatment redox potential was lower than -100 mV during the experiment, but in the treatment of the potential was maintained above 0 mV until remaining in soil solution. Reduction of Fe(III) and solubilization of P were highly correlated with redox potential changes in the three N fertilizer treatments. Concentrations of Fe(II) and in soil solution at 10 cm depth were much higher in the urea+N-serve treatment. The most vigorous rice seedling growth was found in the urea treatment. Although the availability of N and P in soil was enhanced in the urea+N-serve treatment through the suppression of nitrification, excessive solubilization of Fe could limit the growth of rice plants.
Nitrate;Iron;Phosphate solubilization;Oxidationreduction;Paddy soil;Rice;
 Cited by
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