含高粱丝黑穗病孢子的粉砂壤土和砂壤土重新饱和之前,母质势干燥至-0.1、-0.5或-1.5巴,并保存在25、20、15和10℃的培养皿内。在高土温、低母质势土壤上,玉米幼苗的罹病百分率高于低土温、高母质势土壤上的。采用NaCl调节渗透势,使琼脂上冬孢子的发芽率在-22巴溶质势时为22%,接近零时为78%。灌溉小区的黑穗病发病率(22%)明显低于干旱小区的(30%)。在微小区内,粘壤土的母质势高于砂 Prior to desaturation with silt loam soil and sandy loam containing sorghum smut spores, the parent mass was dried to -0.1, -0.5 or -1.5 bar and stored in 25, 20, 15 and 10 ° C dishes. In high soil temperature, low parent material soil, the percentage of maize seedlings suffering from disease is higher than the low soil temperature, high mother mass soil. The osmotic potential was adjusted with NaCl, so that the germination rate of agar on winter spores was 22% at -22 bar solute potential and 78% at near zero. Smut incidence in irrigated plots was significantly lower (22%) than in dry plots (30%). In the micro-area, viscous loam soil parent material is higher than the sand