钙对水稻旱育秧立枯病的控制作用

Control effect on rice dry seedling damping-off by calcium

摘要: 用CaSO4、CaCO3、CaO、CaO2 、CaCl2和Ca(NO3)2 混土处理 ,考察了它们对水稻旱育秧立枯病的防治效果 ,其中CaO和CaO2对该病具有一定的控制作用。用 0.25%～2%CaO水溶液浸种 48h可以使水稻旱育秧立枯病病苗率减少 40%左右 ,以土重 0.5%～1%的CaO处理土壤也使水稻立枯病的发病率降低 50%。在降低立枯病发病率的同时 ,CaO处理也延缓了水稻立枯病的发展。

Abstract: CaSO4、CaCO3、CaO、CaO2 、CaCl2 and Ca(NO3)2 mixed in soil affected the incidence rate of damping-off of rice seedling.CaO2 and CaO were effective in control of this disease. After soaked in 0.25%-2% solutions of oxide calcium for 48-hour, the infected rates of seedling which undergone damping-off were reduced by 40 percent less than the water control. The infected rates of seedling which cultivated in lime treated soil were also half lower than non-treatment. The results showed the above treatments with calcium were relayed the development of rice seedling damping-off.