| Characteristics of nitrate accumulation in soils of new and old apple orchards in Shaanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2019.05.25 |
| Key Words: nitrate accumulation apple orchard tree age the N application rate the new and old apple orchards in Shaanxi province |
| Author Name | Affiliation | | CHEN Cui-xia | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling,Shaanxi 712100, China | | LIU Zhan-jun | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling,Shaanxi 712100, China | | CHEN Zhu-jun | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling,Shaanxi 712100, China | | ZHOU Jian-bin | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling,Shaanxi 712100, China |
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| Abstract: |
| This study surveyed the fertilizer application of fifteen different apple orchards in Luochuan(new apple producing county)and Liquan(old apple producing county)in Shaanxi province. Samples of soil profile from 15 orchards for each region were collected from the two counties for measuring NO-3-N contents in the 0~200 cm soil profiles;meanwhile,the relationships between orchard age, N application rate,and NO-3-N accumulation were also studied. The results showed that excessive N fertilization was very common in both new and old apple orchards in Shaanxi province. The average N application rates were 1 287±244 kg·hm-2 and 1 193±300 kg·hm-2 for the two counties,respectively.It resulted in high N surplus in the soil profiles.The accumulations of NO-3-N in the 0~200 cm soil profile in apple orchard of Luochuan and Liquan were 2 724 kg·hm-2 and 5 226 kg·hm-2,respectively. Nitrate accumulations in the old orchards were significantly higher than that in new orchards. The NO-3-N accumulation in soil profile was positively correlated with the N application rate and the orchard ages. The correlation coefficient with the orchard age was 0.641, and the correlation coefficients with the N application rate was 0.402 and 0.306 for the Luochuan and Liquan counties, respectively. Therefore,controlling N application rate should be an effect way to reduce soil nitrate accumulation in the apple orchards in the region. As a result, that will reduce the resource waste and minimize the pollution to the environment. |
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