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| Effects of Microorganism Agents and Amendment on Composting Process and Maturity of Vegetable Wastes |
| ZHANG Hui，DUAN Yajun，WANG Xiaomin，NING Guohui，ZHANG Xiaoxue，LIU Meng，LIU Yuehan，YANG Zhixin* |
| School of Resources and Environmental Science，Hebei Agricultural University，Baoding 071000，Hebei，China |
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Abstract Taking cucumber，tomato and watermelon vegetable wastes as main materials，bean dregs and weathered coal wastes as auxiliary materials，this paper carried out aerobic composting test through combination of different microorganism agents，their different supplemental amount and auxiliary materials；and studied the effects of different treatments on temperature，total organic carbon，total nutrients，C/N，pH，EC and seed germination index in the process of composting．The results showed that after 50 days of high temperature aerobic composting fermentation，each treatment basically reached maturity．In the process of vegetable waste composting，the treatment only adding microorganism agent without auxiliary materials heating up and cooling down was faster than that of the other treatments．It entered the high temperature stage one day earlier than the other treatments and the highest temperature was 67 ℃．However，the duration of high temperature period was shorter than that of the other treatments（9-16 days）．The degradation rate of organic carbon and C/N were significantly increased by adding 0.1% microorganism agent A and bean dregs and weathered coal wastes auxiliary material（C1）．Its EC value was always maintained within the safe level of 4 mS·cm-1．The germination index increased most fastly with the lengthening of fermentation time，and could reach 103% at the end of composting，having no toxic effect on plant germination and showing a better ripening level than the other treatments．It was recommended as the process parameter for the composting of cucumber，tomato and watermelon mixed wastes．C4 treatment of adding 0.2% microorganism agent B and bean dregs and weathered coal wastes auxiliary materials had the highest nutrient content，reaching 10.79%．Its pH value was significantly lower than that of the other treatments，only 8.41，which had met the national standard for organic fertilizer decomposition．Therefore，it also could be an option for treatment process of composting mixed wastes of cucumber，tomato and watermelon．
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