ANALYSIS OF THE ROTTING PROCESS OF RICE STRAW-CALCIUM CYANAMIDE MIXTURE BY PHYSICAL FRACTIONATION
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概要
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The rotting process of a rice straw-calcium cyanamide mixture (rice straw compost) at 50℃ was studied by physical fractionation methods. The compost was divided into six fractions using a combination of methods which included the use of different sizes of sieves, sedimentation, and centrifugation. The six fractions obtained are F1 (1.0 mm), F2 (1.0-0.25 mm), F3 (0.25-0.043 mm), F4 (sedimented at 4℃), F5 (sedimented by centrifugation at 10^4×g for 10 min), and F6 (supernatant). The results obtained are summarized as follows : 1. With the progress of rotting, rice straw became finely divided, and about 80% of dry matter consisted of fractions F4,F5,and F6 within 10 weeks. The distribution of size fractions remained nearly constant afterwards. 2. The same trends were observed for the fractional distribution of carbon and nitrogen per pot. They were distributed in the order of F6>F5>F4 and F5>F6>F4,respectively. 3. Eighty-five to 90% of the total nitrogen was concentrated in fractions F4-6. 4. C/N ratio of each fraction was almost constant after 5 weeks incubation, except for F1,and the values decreased with a decrease in size. 5. Ash content of each size fraction was nearly unchanged after 10 weeks. Ash was concentrated in fraction F4. 6. The fractions obtained by physical fractionation of rice straw compost were tentatively divided into three major groups : I. Fractions F1-3 consist of coarse plant tissues which became dull yellowish brown to grayish yellow brown. II. Fractions F4 and F5 consist of fine grayish yellow brown plant tissues, microbial cells, and their debris. III. Fraction F6 consists of humic substances.
- 社団法人日本土壌肥料学会の論文
著者
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Kumada Kyoichi
Faculty Of Agriculture And Water Research Institute Nagoya University
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SUZUKI Masaaki
Faculty of Engineering, Tokyo Institute of Technology
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HARADA Kunio
Faculty of Agriculture, Nagoya University
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Harada Kunio
Faculty Of Agriculture Nagoya University
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Suzuki Masaaki
Faculty Of Agriculture Department Of Agricultural Chemistry Kyoto University
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Suzuki Masaaki
Faculty Of Agriculture Nagoya University:(present Address)tropical Agriculture Research Center
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