Soil physical and chemical properties and yield of Guangxi winter potato under different cultivation models

ObjectiveEffects of different cultivation models on soil physical and chemical properties,yield and qua-lity of potato were studied to provide theoretical basis of cultivation techniques of winter potato in Guangxi.MethodMid-late mature potato variety Lishu 6 was taken as material.Three cultivation models,black film mulching,rice straw mulch-ing and conventional cultivation,were set.Soil moisture,bulk density,porosity,organic matter,available nitrogen,available phosphorus,available potassium in each model were determinated,and the main agronomic traits were observed.The physiological and biochemical characteristics of potato leaves at growth stage and quality of potato tuber at the ma-turing stage were evaluated.ResultCompared with conventional cultivation,soil moisture,porosity in rice straw mulching and black film mulching cultivations increased,and soil bulk density,solid phase ratios decreased.Mean-while,the organic matter,available nitrogen,available phosphorus and available potassium also enhanced in rice straw mulching and black film mulching cultivations.The three cultivation models had insignificant difference on plant high,stem diameter and main stem quantity(P>0.05,the same below).Potato number per plant,potato yield per plant and big potato weight in black film mulching cultivation increased significantly(P<0.05,the same below).In addition,black film mulching cultivation decreased green potato weight,therefore extremely(P<0.01)increased commercial potato rate and yield,which were 11.26% and 26.67% higher than those in conventional cultivation.Different cultivation models had in-significant difference on chlorophyll content,tuber dry matter,starch content,reducing sugar content,but soluble pro-tein content and vitamin C content in tuber in black film mulching were significantly higher than those in other models.ConclusionCompared to conventional cultivation,soil physical and chemical properties,yield and quality of potato can be greatly improved by rice straw mulching and black film mulching cultivations.Specifically,black film mulching culti-vation presents sound effects,and can be promoted in winter potato planting in Guangxi.