| Effects of drip irrigation amounts on nitrate-N and water distribution in the root zone of soybean in a wind\|sandy soil |
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| DOI：10.7606/j.issn.1000-7601.2024.02.15 |
| Key Words: wind\|sandy soil soybean root zone drip irrigation nitrate-N water distribution |
| Author Name | Affiliation | | LIU Fuqiang | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou， Jiangsu 225009, China | | DOU Chaoyin | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou， Jiangsu 225009, China | | LI Xiangrui | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou， Jiangsu 225009, China | | CHEN Wei | Liaoning Institute of Water Conservancy and Hydropower Science Research, Shenyang， Liaoning 110000, China |
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| Abstract: |
| The objective of this study was to examine the effects of controlling water and fertilizer inside the root zone and at the same time, meeting soybean development requirements by more logically managing irrigation in wind\|sandy soil environment. Based on the evapotranspiration of the crop canopy at five irrigation levels of 0.4 (W1), 0.6 (W2), 0.8 (W3), 1.0 (W4), and 1.2 Epan (W5), a field experiment was carried out to examine the effects of different irrigation levels on nitrate\|N and water distribution in the root zone of soybean. Increasing the irrigation volume resulted in increase of the depth of soil moisture infiltration by 10~30 cm, increasing the uneven distribution of soil moisture in the root zone. The average water content of the W5 treatment profile during the seedling stage increased by 40.22% compared to the W1 treatment. The W4 and W5 treatments were able to maintain a soil moisture content of 6% to 7% in the soybean root zone. The nitrate-N exhibited a clear epimerization phenomenon. As irrigation volume increased, so did the depth of drenching, inhomogeneity, and average nitrate-N content of the root zone soil decreased. When irrigation volume exceeded 1.0 Epan, nitrate-N was lower than 10 mg·kg-1. In the pre\|fertility, mid\|fertility, and late\|fertility periods, the nitrate-N concentration interval of the soybean root zone was satisfied by the W2, W3, and W4 treatments, which were in the range of 15~22 mg·kg-1. The irrigation volume had a stronger negative vertical correlation with the nitrate-N content of the soybean root zone. The soil profile moisture content of wind\|sandy soil was between 4% and 10%, and the amount of irrigation was one of the primary parameters influencing the distribution and nitrate-N content of wind\|sandy soil; the nitrate-N content of each treatment varied between 10 mg·kg-1 and 30 mg·kg-1. The recommended irrigation water amount was 1.0 Epan, considering the crop’s requirements for soil water and nitrate-N content in the root zone, as well as the features of soil water and nitrate-N distribution in the root layer. |
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