Physicochemical,including spectroscopic,and biological analyses during composting of green tea waste and rice bran |
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Authors: | Mohammad Ashik Iqbal Khan Kihachi Ueno Sakae Horimoto Fuminori Komai Kinji Tanaka Yoshitaka Ono |
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Institution: | (1) Faculty of Agriculture, Saga University, Kuboizumi, Saga 849-0903, Japan;(2) The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima, Japan |
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Abstract: | The aims of this study were to monitor the changes in physicochemical, including spectroscopic, and biological characteristics
during composting of green tea waste–rice bran compost (GRC) and to define parameters suitable for evaluating the stability
of GRC. Compost pile temperature reflected the initiation and stabilization of the composting process. The pH, electrical
conductivity, NO3
−-N content, and carbon-to-nitrogen ratio were measured as chemical properties of the compost. The color (CIELAB variables),
humification index (the absorption ratio Q
4/6 = A
472 / A
664 of 0.5 M NaOH extracts), absorption at 665 nm of acetone extracts, and Fourier-transform infrared (FT-IR) spectra were measured
to evaluate the organic matter transformation; germination of komatsuna or tomato seeds was measured to assess the potential
phytotoxicity of composting materials during composting. No single parameter was capable of giving substantial information
on the composting process, the nutrient balance, phytotoxicity, and organic matter decomposition. The FT-IR spectra at 3,300,
2,930, 2,852, and 1,065 cm−1 provided information on the molecular transformation of GRC during composting and they decreased over the composting. Most
of the assayed parameters showed no further change after about 90 days of composting suggesting that GRC can be used for agricultural
purposes after this period. |
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Keywords: | Green tea waste Rice bran Composting Stability indices |
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