| We research for the environmental benefit intercropping patterns of vicia fava and garlic in Northern Yunnan Province Erhai Lake Basin. economic benefits, crop nutrient utilization, soil nutrient residue, groundwater nitrogen and phosphorus contents of intercropping patterns , and paddy field soil nutrient and the nitrogen and phosphorus contents of surface water in next season. The results showed that: the land equivalent ratio（LER） is greater than 1 of intercropping patterns of vicia fava and garlic, that means high efficiency intercropping than monoculture. The intercropping patterns of vicia fava and garlic significantly increased the nitrogen absorption and utilization, reduced soil nitrate residues, simultaneously, reduced nitrate and soluble nitrogen residues in groundwater. And intercropping mode could reduce the residual of inorganic nitrogen in the soil in the next quarter, also,reduced nitrogen and phosphorus loss risk in surface water of the next season.In this study, the intercropping modes of vicia fava and garlic was not only had better economic benefits but also had better environmental benefits in the local. It would provide reference for popularizing the reasonable planting structure and reducing the loss of nitrogen and phosphorus in farmland, reducing non-point source pollution of farmland. |
