| Study on nitrogen uptake and utilization characteristics of potato and beans intercropping system |
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| DOI：10.7606/j.issn.1000-7601.2022.02.19 |
| Key Words: potato intercropping beans nitrogen utilization land equivalent ratio[HJ0][HJ] |
| Author Name | Affiliation | | MAN Benju | School of Agriculture, Ningxia University，Yinchuan, Ningxia 750021, China | | WANG Jianpeng | School of Agriculture, Ningxia University，Yinchuan, Ningxia 750021, China | | LIU Jili | Institute of Environmental Engineering，Ningxia University,Yinchuan, Ningxia 750021, China | | WU Na | School of Agriculture, Ningxia University，Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Five different planting patterns of monocropping broad bean (IB), monocropping soybean (IS), monocropping potato (IP), potato intercropping soybean (PS) and potato intercropping broad bean (PB) were set up in a randomized block design from March to October in 2020 to explore the effects of different intercropping patterns on potato nitrogen content, soil nitrogen and yield in order to alleviate the obstacles of potato continuous cropping and provide a theoretical basis for the sustainable development of farmland ecosystem in the mountainous area of southern Ningxia. The results showed that intercropping increased the nitrogen content and distribution ratio of potato roots, stems and tubers, but decreased the nitrogen content and distribution ratio of potato leaves. PS effectively increased the contents of alkali\|hydrolyzed nitrogen and total nitrogen, but decreased the contents of ammonium nitrogen and nitrate nitrogen. The content of alkali\|hydrolyzable nitrogen was the highest except at seedling and mature stage. Compared with IP and PB, they were 14.14%~26.19%, 2.25%~24.59%, 1.54%~29.18% and 1.02%~3.45%, 2.08%~2.85% and 2.73%~3.23% higher from bud stage to tuber expansion at 0~20, 20~40 cm and 40~60 cm, respectively. PS was the highest for total nitrogen except at seedling stage. Compared with IP and PB at 0~20, 20~40 cm and 40~60 cm, they were 8.00%~21.93%, 15.46%~59.2%, 19.44%~54.41% and 6.05%~14.48%, 4.41%~36.23%, 12.24%~28.08%, respectively. The nitrate nitrogen was the highest in PS from seedling stage to maturity stage. At 0~20, 20~40 cm and 40~60 cm, they were 30.37%~63.11%, 15.92%~67.81%, 31.93%~79.56% lower than IP, and 8.06%~63.11%, 3.35%~67.81%, 13.08%~35.18% lower than PB. PS was the highest in ammonium nitrogen from seedling stage to maturity stage. At 0~20, 20~40 cm and 40~60 cm, they were 14.21%~39.76%, 31.69%~57.46%, 44.09%~52.98% and 4.91%~37.25%, 4.91%~37.59%, 1.39%~37.51% higher than IP and PB, respectively. The results of membership function analysis showed that the PS treatment had the best comprehensive evaluation, the land equivalent ratio was the largest, and the interspecific competition was the least. The planting mode suitable for popularizing in production was potato intercropping soybean. |
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