| Analysis of equilibrium between nitrogen and phosphorus in thirteen planting patterns in the area irrigated with Yellow River water in Ningxia based on low pollution |
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| DOI：10.7606/j.issn.1000-7601.2012.02.01 |
| Key Words: low pollution nitrogen phosphorus planting pattern |
| Author Name | Affiliation | | LIU Genhong | Ningxia University, Yinchuan, Ningxia 750021, China | | XU Qiang | Ningxia University, Yinchuan, Ningxia 750021, China | | KANG Jianhong | Ningxia University, Yinchuan, Ningxia 750021, China | | WU Hongliang | Ningxia University, Yinchuan, Ningxia 750021, China | | ZHAO Yahui | Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| In the face of the serious pollution caused by fertilizer application to environment and agricultural recession water, a test was conducted to explore soil nitrogen and phosphorus equilibrium regulation and economic valuation for thirteen planting patterns selected from traditional patterns such as planting rice after winter wheat harvest etc and assembled patterns such as cultivating vegetables and silage corn and oil sunflower and so on during
different crops growing seasons compared with spring wheat intercropped with corn for cleaning agricultural production. The outcome showed as follows: Intercropping patterns were beneficial to reducing soil nitrogen and phosphorus amounts on account of prolonging crops covering time during crops growing season, and four cropping patterns of planting rice after winter wheat harvest, planting celery after winter wheat harvest, planting silage after winter wheat harvest and plan
ting oil sunflower after winter wheat harvest were selected based on economic efficiency and less soil nitrogen and phosphorus amounts. The pattern of planting rice after winter wheat harvest was the optimum among four patterns because the amount of soil nitrogen loss was 56.2% less than the control and that of soil phosphorus was 28.6% less than the control after cultivation. |
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