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| Applicability of seed germination test to evaluation of low C/N compost maturity |
| Received:July 03, 2015 |
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| KeyWord:pig manure;woody peat;superphosphate;maturity;seed germination;relative root growth |
| Author Name | Affiliation | E-mail | | LUO Yuan | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | YUAN Jing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Guo-xue | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn | | LI Shu-yan | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JIANG Tao | College of Chemistry, Leshan Normal University, Leshan 614004, China | | | TAN Jun | The Hong Kong International Co., Ltd., Beijing 100024, China | | | XING Wen-jun | The Hong Kong International Co., Ltd., Beijing 100024, China | |
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| Abstract: |
| Seed germination(SG), germination index(GI), and relative root growth(RRG) have been widely used to evaluate the maturity of composts. This research was to examine their applicability to the evaluation of low C/N compost maturity. Two treatments, pig manure amended with woody peat at 15% of the initial composting material wet weight(T1) and T1 supplied with superphosphate at 16% the initial composting material dry weight, were designed. Two kinds of seeds(radish seeds and cabbage seeds) were examined. Results showed that accumulation of ammonium nitrogen in the compost was observed in two treatments, with ammonium nitrogen ranging from 1.77 g·kg-1 DM to 3.40 g·kg-1 DM. High ammonium nitrogen was a major factor inhibiting the root elongation. It was better for compost maturity evaluation to use combined SG and RRG than GI. Both SG≥70% and RRG≥50% would indicate that the composts are mature and don't cause salt damages to crops. |
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