Study On The Mechanism Of Grape Replant Effect Under Different Soil Texture

In order to evaluate mechanism of different replant effects in various soil textures, Beta (Vitis ripari× V.labrusca) was used as material, the replanted soil and soil which no grapevine had been previously grown from the same orchard were used as objects. The orchards were from Four-dominant grape-producing regions in Liaoning. Differences of grape replant effect in the four regions were evaluated. The soils which had different textures from sandy (Dalian) and clay (Xiongyue) were selected, and exogenous grape root decomposing products was added to the soils to study the reason of grape growth in difference texture soil. The shifts of phenolics and correlated soil factors were analyzed to explicit the differences in growth. The major results were as follows.1. The effects of replant soil from different grape-producing region (Beizhen, Shenyang, Xiongyue and Dalian) in Liaoning on plant growth. The soil from Dalian showed the strongest replant obstacles among the four regions and others did not show replant obstacles. The results showed that plant growth had positive correlation with phenolics content in soil, and significant positive correlation with compound phenolic, water-soluble phenolic and content of clay in soil.2. The replant effect in different soil textures was clarified. In sandy soil (Dalian), the plant growth was inhibited under root decomposing products treatment, and with the increase of root decomposing products concentration, the plant growth decreased. However, the plant growth was promoted under root decomposing products treatment in clay (Xiongyue) soil, and with the concentration, the promoting effect decreased. The results showed that plants in sandy soil were more susceptible to the replant effects than that in clay soil.3. The phenolics content in soil showed correlation with soil texture. The phenolics contents in soil was higher, the clay content in soil was more. The total phenolics content had positive correlation with clay content in soil, compound phenolics and water-soluble phenolics had significant correlation with clay content in soil.4. The soil factors which was correlated with phenolics content in soil was found. The main different soil factors existence in sandy (Dalian) and clay (Xiongyue) soil were found. Principal component analysis showed that the soil factors were available N (0.989), organic matter (0.980), available K (0.969), total N (0.953) and total phenolics (0.946). Correlation analysis showed that total phenolics in soil showed significant correlation with organic matter, total N, available N, available K, soil urease and phosphatase, had significant negative correlation with total K, available K and pH.