Nitrogen Transfer and Dry Matter Production in Soybean and Sorghum Mixed Cropping System at Different Population Densities

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Color changes of different mixtures of sewage sludge or city refuse during the composting and maturation processes were investigated by applying the method of measurement for the color of the materials based on the CIE 1931 Standard Colorimetric System. Optical density changes of the alkaline extracts from the samples during these processes were also determined. The stimulus value Y and Munsell notation value decreased rapidly during the first 65 days of piling and then reached a constant value. While organic wastes were rotting and maturing, the stimulus value Y and the WSC/N ratio equally decreased. A positive correlation between the stimulus value Y and WSC/N ratio with a correlation coefficient of 0.631 (p=0.001) was observed. Correlation coefficients between the stimulus value Y and C/N ratio were not significant. Optical density of the alkaline extracts from the different samples increased during the piling period and remained nearly constant during maturation process. It was concluded that the constant values of absorbance/ExC indicate a good maturity degree of the composts.
社団法人日本土壌肥料学会の論文