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| Soil nitrate accumulation and its environmental effects under various irrigation modes in protected field |
| Received:May 17, 2017 |
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| KeyWord:protected field soil;irrigation mode;nitrate accumulation;soil pH |
| Author Name | Affiliation | E-mail | | FAN Qing-feng | College of Land and Environmental Science, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | ZHANG Yu-long | College of Land and Environmental Science, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | ylzsau@163.com | | ZHANG Yu-ling | College of Land and Environmental Science, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | | | YU Na | College of Land and Environmental Science, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, China | |
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| Abstract: |
| Field experiments, were conducted to investigate the effects of drip irrigation, subsurface irrigation, and furrow irrigation on the accumulation of nitrate and soluble salts in the soil, on soil pH, and on nitrate content and water production efficiency in fruit in a protected field. Nitrate and total salt mainly accumulated in the surface layer of the soil. There was significantly less nitrate and total salt in the uppermost 0~20 cm of the soil after drip irrigation than after furrow or subsurface irrigation. The soil pH increased with increasing soil depth with all three irrigation methods. The soil pH of the uppermost 0~30 cm of soil followed the order:drip irrigation > furrow irrigation > subsurface irrigation. The nitrate content of the fruit under drip irrigation was significantly lower than that under furrow or subsurface irrigation. There was no significant difference between furrow irrigation and subsurface irrigation in terms of nitrate content. Water production efficiency under drip irrigation and subsurface irrigation was significantly higher than that under furrow irrigation. There was a significantly negative correlation between soil nitrate content and pH, whereas there was a positive correlation between soil nitrate content and soluble salt content. In conclusion, the accumulation of nitrate in protected fields is closely related to the content of soluble salt, soil pH, and the nitrate content of fruit. Compared with furrow and subsurface irrigation, drip irrigation inhibits soil degradation. |
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