Pedosphere 22(6): 815--824, 2012
ISSN 1002-0160/CN 32-1315/P
©2012 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Humic-like substances from different compost extracts could significantly promote cucumber growth |
XU Da-Bing, WANG Qiu-Jun, WU Yun-Cheng, YU Guang-Hui, SHEN Qi-Rong and HUANG Qi-Wei |
| Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing 210095 (China) |
| ABSTRACT |
| The effects of direct extracts of compost (DEC), aerated fermentation extracts of compost (AFEC) and non-aerated fermentation extracts of compost (NAFEC) on cucumber growth and the action mechanisms were evaluated based on the structure and activity analysis of humic-like substances. AFEC increased cucumber growth most significantly, followed by DEC and NAFEC, which was insignificant compared to the control treatment. Humic-like substances from compost extracts played an important role in promoting cucumber growth. Application of humic-like substances stimulated auxin-like activity and increased chlorophyll content and nitrogen accumulation in plants. The positive auxin-like activity of humic-like substances could be attributed to the relative distribution of special carbon groups, such as those with a large amount of peptidic and carbohydratic groups or with a low content of phenolic groups. In conclusion, the best growth promotion by application of AFEC was mainly attributed to the humic-like substances in the AFEC. |
| Key Words: auxin-like activity, 13C nuclear magnetic resonance, chemical structure, elemental composition analysis |
| Citation: Xu, D. B., Wang, Q. J., Wu, Y. C., Yu, G. H., Shen, Q. R. and Huang, Q. W. 2012. Humic-like substances from different compost extracts could significantly promote cucumber growth. Pedosphere. 22(6): 815-824. |
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