二氧化氯和有机肥对黄瓜枯萎病的防治分析-control analysis of chlorine dioxide and organic fertilizer on cucumber fusarium wilt.docx

二氧化氯和有机肥对黄瓜枯萎病的防治研究some treatments. Significant suppressive effects appeared when the ClO2 concentration was higher than 40mg/L. Soaking seed after pregermination, ClO2 had no significant negative effects on germination when concentration was less than 10mg/L, a much lower concentration than 40mg/L, and significant suppresseive effects appeared after the concentration was higher than 10mg/L.ClO2 could improve cucumber growth when applied to soil one week before seeding and with the increase in ClO2 treating concentration, cucumber growth increased first and then declined. The treatment with best cucumber appearance was that with ClO2 concentration of 200mg/L and cucumber height and weight were increased by 50% and 108% compared with control.Manure could control cucumber Fusarium wilt effectively, and the control effect varied according to fertilization style, manure dosage and other factors. For different fertilization style, base manuring combied with foliar spray got the best disease control effect and next was base manuring solely and foliar spray solely. The disease control effect also increased with the manuring intensity. Sterilization treatment to manure could affect its disease control effect at the beginning, but it general control effect was not significantely affected.The suppressive effect of manure on Fusarium oxysporum was significant and the suppressive effects of solid manure were more significant than that of manure extract solution. Suppressive zone appeared around manure in culture dish with Fusarium oxysporum being inoculated. The diameter of suppresive zone around solid manure increased with culture time and the maximal diameter reached 7.9cm and 6.2cm for cattle feces and microbial manure respectively. The suppresive zone of manure extract solution also increased first and then declined with time increase, and the maximum suppresive zone reached 2.7cm and 2.5cm in diameter for cattle feces and microbial manure respectively.Soil microorganism i