Pedosphere 16(6): 770--777, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Environmental problems from tea cultivation in Japan and a control measure using calcium cyanamide |
K. OH1 , T. KATO2, LI Zhong-Pei3 and LI Fa-Yun4 |
1 Center for Environmental Science in Saitama Saitama 347-0115 (Japan). E-mail: a1093353@Pref.saitama.lg.jp;
2. Jinenjou-no-kai NPO Shizuoka 421-0302 (Japan);
3 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);
4 Faculty of Environmental Sciences, Liaoning University, Shenyang 110016 (China) |
| ABSTRACT |
| A field experiment, involving lime N (calcium cyanamide, CaCN2) fertilization as a control measure, was conducted to study environmental problems induced by long-term heavy N application in Japanese tea fields. Long-term tea cultivation caused serious soil acidification. Seventy-seven percent of the 70 tea fields investigated had soil pH values below 4.0, and 9% below 3.0, with the lowest value of 2.7. Moreover, excess N application in tea fields put a threat to plant growth, induced serious nitrate contamination to local water, and caused high nitrous oxide loss. Compared with the conventional high N application treatment (1100 kg N ha-1) without lime N, the low N application (400 kg N ha-1) with calcium cyanamide effectively stopped soil acidification as well as achieved the same or slightly higher levels in tea yield and in total N and amino acid contents of tea shoots. The application of calcium cyanamide could be a suitable fertilization for the prevention of environmental problems in tea cultivation. |
| Key Words: calcium cyanamide, nitrous oxide emissions, soil acidification, tea cultivation, water contamination |
| Citation: Oh, K., Kato, T., Li, Z. P. and Li, F. Y. 2006. Environmental problems from tea cultivation in Japan and a control measure using calcium cyanamide. Pedosphere. 16(6): 770-777. |
|
View Full Text
|
|
|
|
