Effects of Organic Matter Application on Growth of Rice Plants, Soil Environments and Methane Emission from Paddy Fields.

概要

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In various plots of rice paddy fields applied with different amounts of rice straw or compost, growth of rice plants, soil Eh, methane concentrations in soil gas, and methane emission rates were measured over the cultivation period. The number of tiller of rice plants increased during June at different rates depending on the plots. During the tillering stage the soil Eh dropped to about -100 mV in almost all the plots. The Eh raised after the midseason drainage, but after that the Eh dropped again in some plots. The methane concentrations in the soil gas were more than 40% in the plots applied with rice straw even soon after the transplanting. At the tillering stage the concentrations were more than 30% in almost all the plots. The methane emission rates were very low soon after the transplanting and markedly increased at the maximum tiller stage. At this time the emission rate from the plot applied with rice straw was the highest in all the plots. After the maximum tiller stage, the emission rates usually decreased and the number of tiller of rice plants per area of paddy field was positively correlated with the soil Eh and negatively correlated with the methane concentrations in soil gas and also with the methane emission rates. It was suggested that the difference of growth of rice plants affects the soil environment of paddy field and also the methane emission rate.
社団法人環境科学会の論文