COLOR CHANGE OF STRAW DURING COMPOSTING

概要

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Color change of straw during the composting process was investigated by applying the method of measurement for color of materials based on the CIE 1931 Standard Colorimetric System. The following findings were obtained : (1) the shapes of the relative spectral reflectance curves of rice and barley straw were different from each other immediately after straw had been air-dried, but they gradually became smooth and similar during composting, (2) the stimulus value Y, which generally indicates the degree of lightness of materials, decreased rapidly during the first 42 days piling of rice straw treated without the addition of calcium cyanamide and then reached a constant value, (3) the stimulus value Y reached a constant value rather rapidly when rice and barley straw were treated with calcium cyanamide, and (4) the chromaticity coordinates (x,y), which specify Munsell renotation hue and chroma, hardly changed. A positive correlation between the stimulus value Y and the C/N ratio with a correlation coefficient of 0.931 (P<0.001) was observed in rice straw compost treated without the addition of calcium cyanamide. The regression equation was Y= 0.549 C/N+7.64 and the standard error of regression estimates was 3.1 (n=9). It is concluded that the constant value of Y observed after piling indicates the threshold of maturity of straw compost, although full maturation was seldom reached.
一般社団法人日本土壌肥料学会の論文