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| Nitrogen inputs and nitrate accumulation and movement in soil of kiwifruit orchards |
| Received:August 28, 2015 |
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| KeyWord:northern slope region of Qinling Mountains;kiwifruit orchard;NO3--N accumulation;rainy season;NO3--N movement |
| Author Name | Affiliation | E-mail | | GAO Jing-bo | College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | LU Yong-li | College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | CHEN Zhu-jun | College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHOU Jian-bin | College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | jbzhou@nwsuaf.edu.cn |
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| Abstract: |
| The northern slope region of the Qinling Mountains is the main growing area of kiwifruit in Shaanxi Province. However, inadequate application of nitrogen(N) in kiwifruit orchard is very common. Therefore, studying N plant utilization and movement in soil is of great significance for achieving balanced fertilization and evaluating the effect of N fertilization on the environment in this region. A survey was conducted in Yujiahe catchment in 2014 to assess the status of N inputs. Soil profile samples in 0~200 cm depth from mature kiwifruit orchards were collected to examine the accumulation and movement of NO3--N in the soil profiles of sloping kiwifruit orchard. Excessive applications of N were very severe in the catchment. The surplus of N applied was high up to 1195 kg·hm-2 with residual NO3--N being 827 kg·hm-2 in the 0~200 cm soil profile, of which 52% of N was accumulated in 100~200 cm soil profile. The accumulation of NO3-N in the 0~200 cm soil profile was dependent on the locations within an orchard:more NO3-N was accumulated in the lower part than in the upper one of a slope. After a rainy season, NO3-N was leached to deeper part of the soil profile. It is concluded that excessive additions of N to kiwifruit orchard in Yujiahe catchment results in high accumulation of NO3--N in the soil. The NO3-N leaching in soil profiles during the rainy season is also severe. Nitrate leaching not only wastes N fertilizer resource, but also increases potential risk to the quality of both surface and groundwater. |
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