Control effect on rice dry seedling damping-off by calcium

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.