腐殖酸提高噁霉灵抑制水稻立枯病的作用效果研究OA

Rice seedling blight,caused by infection of Fusarium oxysporum,poses a severe threat to the safe and efficient production of rice.Currently,in agricultural practices,chemical fungicides such as hymexazol are primarily relied upon for the prevention and control of rice seedling blight.However,the long-term irrational use of these chemical fungicides not only leads to a decrease in their efficacy but also pollutes the environment.Using green pesticide synergists,such as humic acid,is an important approach to addressing this issue.This study aims to explore the effects of humic acid on the efficacy of hymexazol at different concentrations in inhibiting rice seedling blight,thereby achieving reduced use and enhanced effectiveness of hymexazol.The experimental results showed that humic acid significantly increased the inhibition rate of hymexazol at different concentrations and reduced the incidence of seedling blight under various hymexazol treatments.Furthermore,in treatments with low concentrations of hymexazol(150 mg/L and 150 mg/kg),the relative synergistic efficiency of humic acid was significantly higher than that in treatments with higher concentrations of hymexazol.Analysis of variance sources indicated that both humic acid treatment alone and its combination with hymexazol at different concentrations could significantly affect the incidence of seedling blight,seedling emergence rate,and rice seedling biomass.However,only humic acid treatment alone could significantly influence the plant height of rice.In summary,humic acid can significantly enhance the disease-suppressing effect of low-concentration hymexazol.The combined use of humic acid and hymexazol represents an important strategy for synergizing efficacy and reducing pesticide usage,which contributes to promoting green prevention and control of rice seedling blight.