石膏による稲わらおよび稲わら堆肥の分解調節

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The effects of gypsum on the decomposition of rice straw and rice straw manure were examined in comparing with those of hydroxy-Al.1) The dry weight of rice straw, rice straw with gypsum and rice straw with hydroxy-Al at 12 weeks into the humification process were 27, 35 and 56% of initial dry weight, respectively. The C/N ratio of both rice straw and rice straw with gypsum were changed similarly, and after 12 weeks of incubation at 50℃, the C/N ratios of both treatments were about 8. On the other hand, that of rice straw with hydroxy-Al was significantly higher (13 at 12 weeks). 2) The rate of nitrogen mineralization of rice straw manure and rice straw manure with gypsum were almost equal at 35 d of incubation. After 35 d of incubation, however, the mineralization rate of rice straw manure with gypsum was higher than that of rice straw manure. The decomposition ratio of rice straw manure with gypsum treatment was lower than that of rice straw manure. The decomposition ratio of rice straw manure with hydroxy-Al was significantly lower than the ratios of the others. 3) The kinetics of the carbon mineralization process of rice straw manure were studied. The amount of potential decomposable carbon in rice straw manure treated by gypsum was 12% lower than rice straw manure with no treatment, however, the mineralization rate constant was not different between the two. With hydroxy-Al treatment, both the decomposable carbon and the mineralization rate constant were 33 and 62% of the rice straw manure with no treatment, respectively. These results indicate that gypsum and hydroxy-Al have an effect on the control of decomposition of rice straw and rice straw manure. However, the effect of hydroxy-Al was so strong that the nutrient supply from manure becomes much smaller. Therefore, gypsum is a more favorable material to control the decomposition of rice straw manure.
1997-12-05

石膏による稲わらおよび稲わら堆肥の分解調節

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