用S-H混合物(4.4%蔗渣,8.4%稻壳,4.25%牡蛎壳粉,8.25%尿素,1.01%硝酸钾,13.16%过磷酸钙和60.5%矿质粉)改良壤质土,对降低西瓜枯萎病菌(Fusarium oxysporum f.sp.ni-veum)的存活率有显著效果。牡蛎壳粉、矿质粉、玉米秸、未熏蒸的稻壳、熏蒸的稻壳和牛粪也有效果,但效果较差。而用蔗渣改良,土壤中病原菌存活率增加。对于砂质土用S-H混合物改良的,病原 Improvement of loamy soil with SH mix (4.4% bagasse, 8.4% rice husk, 4.25% oyster shell powder, 8.25% urea, 1.01% potassium nitrate, 13.16% superphosphate and 60.5% mineral powder) Fusarium oxysporum f.sp.ni-veum) has a significant effect on the survival rate. Oyster shell powder, mineral flour, corn stalks, non-fumigated rice husk, fumigated rice hulls and cow dung also have effect, but less effective. With bagasse improved, the survival rate of pathogenic bacteria in the soil increased. Modified, pathogenic for S-H mixtures for sandy soils