| Effect of nitrogen application time on the distribution of soil nitrogen under drip fertigation |
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| DOI：10.7606/j.issn.1000-7601.2017.03.29 |
| Key Words: fertigation nitrogen application time NO3--N NH4+-N space-time distribution |
| Author Name | Affiliation | | WANG Xu-yang | Institution of soil and water Conservation, Chinese Academy of Science, Shaanxi, Yangling 712100, China；University of Chinese Academy of Sciences, Beijing 100049, China | | FAN Xing-ke | Institution of soil and water Conservation, Chinese Academy of Science, Shaanxi, Yangling 712100, China；North West Agriculture and Forestry University, Shaanxi, Yangling 712100, China |
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| Abstract: |
| Using single-point infiltrational simulation, an experiment on different nitrogen application time under drip fertigation was conducted. Soil ammonium and nitrate content in different location was measured at different time after drip irrigation. The results showed that the region with high nitrogen content was always near the drip emitter for fertigation during the whole drip irrigation. Maximum NO3--N content occurred at 15～25 cm horizontal distance and 15～30 cm vertical distance for fertigation during the first half time of drip irrigation. The region with high nitrogen was always near the drip emitter for fertigation during the second half time of drip irrigation，but the content is rather high. Maximum NO3--N content existed at 15cm horizontal distance and 15 cm vertical distance for fertigation in the middle half of the time. The peak content of NO3--N in wetted soil body occurred on the 5th day and then became smaller with time. The transforming rate of NH4+-N was relatively fast, and the nitrification was most strong on the third day after irrigation, resulting in the ammonium content decreased sharply from the third day to the fifth. |
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