CIELAB color variables as indicators of compost stability |
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| Authors: | Mohammad Ashik Iqbal Khan Kihachi Ueno Sakae Horimoto Fuminori Komai Takashi Someya Koichi Inoue 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 890-0065, Japan;1. Laboratory of Ecology and Environment (L2E) (Unit Associated with the CNRST, URAC32), Faculty of Science Semlalia, Cadi Ayyad University, BP: 2390, Marrakesh, Morocco;2. Laboratory of Physico-Chemical of Materials and Environment (LPCME), Faculty of Science Semlalia, Cadi Ayyad University, BP: 2390, Marrakech, Morocco;3. School of Science and Engineering, Al akhawayn University in Ifrane, BP: 1846, Ifrane, Morocco;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China;3. College of Resources and Environment, Hunan Agricultural University, Changsha 410082, PR China;1. Department of Agricultural Chemistry and Soil Science, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741252, Nadia, West Bengal, India;2. Upper Assam Advisory Centre, Tea Research Association, Dikom-786101, Assam, India;3. Indian Agricultural Statistics Research Institute, New Delhi 110012, India;4. Dibrugarh Polytechnic, Lahowal, Dibrugarh-786010, Assam, India;1. College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China;1. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071, Granada, Spain;2. Houston Center for Biomaterials and Biomimetics, Department of Restorative Dentistry and Prosthodontics, University of Texas, School of Dentistry, 7500 Cambridge St., Houston, TX 77054, USA;3. Department of Restorative Dentistry and Prosthodontics, The University of Texas Dental Branch at Houston, 7500 Cambridge Dr., Ste. 5437, Houston, TX 77054, USA;4. Department of Computer Architecture and Computer Technology, E.T.S.I.I.T. University of Granada, s/n 18071, Granada, Spain |
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| Abstract: | The composting process of different organic wastes both in laboratory and on a large-scale was characterized using CIELAB color variables to evaluate compost stability for the better application in agriculture. The time courses of the CIELAB variables of composting materials were determined directly from the bottom of a glass petri dish filled with dried and ground samples using a Minolta Color Reader (CR-13) calibrated with clean empty petri dishes placed on a white tile. To compare the proposed method with conventional methods, the same materials were also evaluated using commonly used compost stability evaluation indices. Most of the CIELAB variables of a compost made from a mixture of green tea waste and rice bran reached a plateau after 84 days of composting and showed strong relationships with the commonly used compost stability evaluation indices. The time needed for CIELAB variables, especially the L*and b* values, to stabilize at large-scale composting plants of cattle litter, farmyard manure, kitchen garbage and bark compost, were more or less similar to the times of maturation evaluated by the respective compost producers. The CIELAB color variable offers a new, simple, rapid and inexpensive means of evaluating compost stability and its quality prior to agricultural use. |
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