有机改良剂对棉花黄萎病的防治效果及其对根际微生物区系的影响

用7种不同有机改良剂处理土壤，在盆栽和田问小区试验条件下分别研究了它们对棉花黄萎病的防治效果。调查结果表明：几丁质(蟹壳粉)处理对棉花黄萎病的防治效果最好，在盆栽和小区试验中病情指数分别比对照降低了72．21％和62．26％；豆秸粉和绿肥(新鲜油菜叶腐熟物)也有较好的防效，在盆栽和小区试验中均达到50％以上。田问小区的试验结果与盆栽试验结果基本一致。对根际微生物区系分析结果表明，不同有机改良剂处理土壤后根际微生物群体数量显著增加，种类增多，区系组成更加复杂，而且对棉花黄萎病菌具有抑制作用的真菌和放线菌比率也高于对照。

The effects of organic amendments on cotton Verticillium wilt and microbes in rhizosphere

The effects of seven organic amendments on cotton Verticillium wilt were investigated in harvest time in pots and plots respectively. Chitin (crab shell powder) was the best one for controlling disease with a 72.21% reducing of disease index in pots and 62.26% reducing in plots. bean stalk powder and green manure (fresh oilseed leaves) have more than 50% reducing of disease index in pots and plots. The results showed that the population of microbes and fungi species in rhizosphere increase remarkably after applying organic amendments, and the rates of inhibiting fungi and actinomycetes to Verticillium dahliae was higher than that of CK.