| Cultivation structure optimization of crops with low nitrogen and phosphorus pollution in irrigated Yellow River region of Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2016.01.22 |
| Key Words: nitrogen phosphorus low pollution planting patterns Ningxia irrigated Yellow River region |
| Author Name | Affiliation | | LIU Gen-hong | Ningxia University, Yinchuan, Ningxia 750021, China | | XU Qiang | Ningxia University, Yinchuan, Ningxia 750021, China | | QIAO Na | Ningxia University, Yinchuan, Ningxia 750021, China | | KANG Jian-hong | Ningxia University, Yinchuan, Ningxia 750021, China | | WU Hong-liang | Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Because the environment and agricultural water recession polluted severely by fertilizer applied through agricultural production, to reduce losses of soil nitrogen and phosphorus, as well as to improve economic benefits, cultivation structure was optimized in this research using a linear programming method based on a previous trial result. The results showed that the economic benefits of rice and winter wheat-rice were 36.8% and 28.2% higher respectively than the control of spring wheat/corn, respectively. The amounts of nitrogen loss for cultivation patterns of winter/spring wheat-silage, winter/spring wheat-vegetables, solely corn and oil sunflower were reduced by 56.8%, 50%, 36.4% and 50%, respectively from that of wheat/corn. The amounts of phosphorus loss for patterns of winter/spring wheat-silage, vegetables, and winter/spring wheat-oil sunflower were 50%, 42%, and 35.7% lower than that of wheat/corn, respectively. The areas for different cultivation patterns after optimization were as follows: 38 000 hectares sowing area for spring wheat/corn, 10 900 hectares for winter wheat-silage, 6 700 hectares for rice, 55 000 hectares for vegetables,135 000 hectares for corn, and 40 000 hectares for oil sunflower. Rational field arrangement combined with current cultivation conditions and technologies might be helpful for economy development and minimize nitrogen and phosphorus losses. |
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