| Variation trend of soil nutrients in farmlands in east Guanzhong plain——A case study of Linwei District |
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| DOI：10.7606/j.issn.1000-7601.2013.02.15 |
| Key Words: soil fertility Linwei District farmland |
| Author Name | Affiliation | | ZHANG Quanfeng | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Weinan Test and Inspection Center for Agricultural Products Safety and Quality, Weinan, Shaanxi 714000, China
Weinan Agricultural Technology Extension Centre, Weinan, Shaanxi 714000, China | | WANG Yiquan | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHAO Xiaojin | Weinan Agricultural Technology Extension Centre, Weinan, Shaanxi 714000, China | | HU Ming | Weinan Teachers College, Weinan, Shaanxi 714000, China | | JING Xiaoli | Weinan Agricultural Technology Extension Centre, Weinan, Shaanxi 714000, China |
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| Abstract: |
| Based on the monitoring data of soil testing and fertilization project conducted in Linwei District in 2007—2010 and the second nationwide general soil survey data, the status and variation trend of soil nutrients in farmlands in east Guanzhong plain was analyzed. The results showed that the contents of soil organic matter, total N, alkali hydrolyzable N and available P were greatly increased by 6.02 g·kg-1, 0.21 g·kg-1, 28.6 mg·kg-1 and 13.6 mg·kg-1 respectively, but the average content of exchangeable K was decreased by 12.6 mg·kg-1, compared with the data given in the second soil survey in 1982. The average contents of micro elements such as available Fe, available Mn, available Cu and available Zn in the soil were also increased by 3.157 mg·kg-1, 2.305 mg·kg-1, 1.485 mg·kg-1 and 0.852 mg·kg-1 respectively, compared with the data in 1982. It was concluded that the soil organic matter, total N, alkali-hydrolyzable N and available P tended to be accumulated. As a whole, the soil nitrogen was surplus, the phosphorus was accumulated, while the potassium was decreased but it was still at adequate level; the situation of available S and available Zn varied among different fields; the available Fe and available Mn were generally short; and the available Cu was relatively rich. |
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