Adaptability Of Mulberry-peanut Intercropping On Calcareous Soil And Its Effect On Soil Nutrient Dynamics In Field

In order to determine the adaptability of mulberry-peanut intercropping in calcareous soil,and the control effect on non-point source pollution in northwestern Liaoning,this paper takes peanut as the research object to investigate the nutrient content of peanuts and soil nutrient characteristics under the conditions of mulberry-peanut intercropping and peanut monocropping under normal soil conditions and high calcium soil conditions,analysis of adaptability of mulberry-peanut intercropping in calcareous soil through intercropping mulberry pot experiment.The soil nutrient dynamic feature of different soil layers under two planting patterns were studied through peanut field experiment.analysis of the effects of intercropping mulberry on non-point source pollution in northwestern Liaoning.the results show that:(1)Simulated calcareous soil inhibited the effectiveness of peanut monoculture soil iron,reduced photosynthetic pigment content in peanut leaves,and inhibited growth of peanut.Intercropping mulberry under normal soil conditions increased the iron activity of peanut leaves,increased the photosynthetic pigment content of peanut leaves,and significantly increased the aboveground biomass and root biomass of peanuts,which increased by 55.40% and 82.00% respectively.The soil available iron content increased,and the photosynthetic pigment content of peanut leaves increased,and the peanut root biomass was significantly increased under high calcium soil conditions.(2)In the simulated calcareous soil,the content of tissues calcium in the aboveground part of peanut monoculture increased significantly.The content of exchanged calcium in the calcareous soil decreased after intercropping with mulberry,and the calcium content in the aboveground part of peanut decreased significantly,which alleviated the toxicity of excess calcium to peanut.At the same time,the contents of nitrogen,phosphorus and potassium in the aboveground part of peanut decreased under high calcium soil conditions,while intercropped mulberry increased the content of available potassium in soil,the contents of nitrogen,phosphorus and potassium in the aboveground tissues of peanut increased by 3.02%,23.95% and 12.27% respectively.(3)Except available potassium,all nutrients showed a decreasing trend with the increase of soil depth.Intercropping mulberry affected the contents of ammonium nitrogen,nitrate nitrogen,available phosphorus and organic matter in different soil layers.The results showed that the effect of intercropping mulberry on the nutrient content of surface soil was greater than that of deep soil.(4)After fertilization,intercropping mulberry rapidly reduced the content of nitrate nitrogen in soil,and significantly controlled the infiltration of total nitrogen in soil.In addition to fertilization,intercropping mulberry can improve the contents of total nitrogen,organic matter,nitrate nitrogen,ammonium nitrogen,available phosphorus and available potassium in peanut soil,and play a role in improving soil.In summary,mulberry-peanut intercropping promotes the growth of peanut in both normal and high-calcium soils,and controls the excessive absorption of calcium by peanuts in high-calcium soils,so mulberry-peanut intercropping has wide adaptability.Sandy peanut intercropping mulberry can quickly absorb excessive nitrate nitrogen and other nutrients in the soil after fertilization,reduce the transfer of non-point source pollutants in the soil,at the same time,it can improve the content of soil organic matter,total nitrogen,available phosphorus,available potassium and other nutrients,and improve the growth environment of peanut.