Effect of Controlled Drainage on Loss and Utilization of Nitrogen in Hetao Irrigation District

被引：0
|
作者：
Dou X. [1 ,2 ]
Shi H. [1 ,2 ]
Li R. [1 ,2 ]
Miao Q. [1 ,2 ]
Tian F. [1 ,2 ]
Yu D. [1 ,2 ]
机构：
[1] College of Water Conservancy and Civil Engineering, Inner Mongolia Agriculture University, Huhhot
[2] High Efficiency Water-saving Technology and Equipment and Soil Water Environment Engineering Research Center of Inner Mongolia Autonomous Region, Huhhot
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2021年 / 52卷 / 11期
关键词：
Controlled drainage; NH[!sub]4[!/sub][!sup]+[!/sup]-N; Nitrogen loss and utilization; NO[!sub]3[!/sub][!sup]-[!/sup]-N; Oil sunflower;
D O I：
10.6041/j.issn.1000-1298.2021.11.034
中图分类号：
学科分类号：
摘要：
To explore the effect of controlling drainage on soil nitrogen loss, nitrogen fertilizer use efficiency and yield in oil sunflower farmland, the growth period control drainage depth was set to be 40 cm (K1), 70 cm (K2), and 100 cm (K3), open ditch drainage was chosen as the control treatment (CK), and field trials were carried out. The results showed that the soil NH4+-N content of K1 treatment was the highest, with an average value of 20.17 mg/kg, which was significantly higher than that of other treatments (P<0.05), and was 31.36%, 46.16%, 15.22% higher than that of K2, K3 and CK treatments. The NO3--N content of 0~40 cm soil after irrigation during the growth period showed the trend from large to small as K1, CK, K2 and K3. The loss of NO3--N in different treatments was greater than that of NH4+-N. The loss of NO3--N in K1, K2, K3 and CK treatments was 60%, 52.63%, 30.77% and 58.82% higher than NH4+-N, respectively. For the subsurface drainage treatment, the smaller the outlet depth was, the smaller the drainage and the nitrogen loss were, and the control of drainage stabilized the change of groundwater depth. The controlled drainage treatment (K1, K2) increased the partial productivity of nitrogen fertilizer by 3.04% ~ 11.15%, and increased nutrient absorption. The partial productivity of nitrogen fertilizer in K1 treatment was the largest, which was increased by 4.54%, 7.72% and 11.15% compared with K2, K3 and CK treatments respectively (P<0.05). K1 treatment can significantly increase corn yield (P<0.05), which was 4.52%, 7.69% and 11.14% higher than that of K2, K3 and CK treatments, respectively. After the oil sunflower was harvested, the NH4+-N content of 0~100 cm soil in each treatment was 0.98~8.13 mg/kg, and the soil NH4+-N content was decreased with the increase of soil depth, the soil NH4+-N content in 0~40 cm soil layer of CK treatment was the largest, which was 11.65%, 14.55% and 18.19% larger than that of K1, K2 and K3, respectively (P<0.05). The NO3--N content in the same soil layer under the same treatment was significantly higher than the NH4+-N content. After irrigation during the growth period, the NO3--N in the 0~10 cm soil would flow to the deep soil with water, while most of the NO3--N in the K1 treatment would be accumulated in the 20~40 cm soil layer. In the middle and late stages of growth, the 20~40 cm soil layer was the vigorous oil sunflower root layer, and the K1 treatment had relatively high nitrogen utilization in the soil. Considering oil sunflower yield, soil nitrogen change law, nitrogen fertilizer use efficiency and nitrogen loss, the suitable drainage method was to control the drainage depth of 40 cm during the growth period (K1). © 2021, Chinese Society of Agricultural Machinery. All right reserved.
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页码：315 / 322and420
相关论文
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