连作西瓜抗逆系统及土壤微生态对大蒜伴生的响应

以大蒜-西瓜化感伴生栽培模式为研究对象,设置连作西瓜单作(对照)、大蒜苗期伴生连作西瓜、大蒜全生育期伴生连作西瓜3个处理,考察西瓜枯萎病发病率,西瓜叶片抗氧化酶活性和渗透调节物质含量,以及根际土壤酶活性和微生物数量,探索大蒜伴生对西瓜酶促抗氧化系统及土壤特性的影响.结果表明:(1)大蒜-西瓜伴生栽培体系中,西瓜枯萎病发...

Response of Continuous Cropping Watermelon Resistance System and Soil Micro ecology to Associative Garlic

Taking the garlic watermelon allelopathy associated cultivation model as the research object, we set up three treatments of watermelon monocropping, garlic seedling stage accompanying watermelon, garlic full growth stage accompanying watermelon, and investigated the incidence of watermelon fusarium wilt, watermelon leaf antioxidant enzyme activities and osmotic adjustment substance contents, as well as rhizosphere soil enzyme activity and microbial quantity, to explore the influence of garlic accompanying on the enzymatic antioxidant system of watermelon and soil characteristics. The results showed that: (1) in the garlic associated cultivation system, the incidence of watermelon fusarium wilt was significantly lower than that of the monoculture control, and the associated treatment effect during the whole growth period was better. (2) The garlic associated cultivation of watermelon leaf antioxidant enzymes (superoxide dismutase, superoxide dismutase, etc.) activities of peroxidase and catalase were significantly increased compared with the single control, and the increase in the associated treatments during the whole growth period was greater. (3) The soluble sugar and soluble protein contents in leaves of the garlic associated cultivated watermelon were significantly increased than the single control, while its proline content was significantly reduced, and the accompanying treatments changed more throughout the growth period. (4) The number of fungi and Fusarium oxysporum in the rhizosphere soil of the garlic associated watermelon was significantly reduced compared to the single control, while the number of bacteria and actinomycetes significantly increased. At the same time, the activities of polyphenol oxidase, peroxidase and urease in the rhizosphere soil of watermelon increased compared with the control, while the activity of invertase decreased significantly. It can be seen that garlic associated cultivation significantly inhibited the incidence of watermelon fusarium wilt, enhanced plant leaf antioxidant enzyme activities, increased plant leaf osmotic adjustment substance contents, and effectively improved rhizosphere soil colony balance and soil enzyme activities, thereby increasing watermelon resistance and rhizosphere soil quality, effectively breaking the watermelon continuous cropping barriers.