堆肥用作育苗基质对团花根腐病的抑制作用

Inhibitory Effect of Compost as Nursery Substrates on Root Rot of Anthocephalus chinensis

热区珍贵速生阔叶树种团花,其幼苗时期的根、茎易受根腐病侵染,严重影响了苗木质量。采用农业有机废物堆肥用作育苗基质,以人工接种病原菌的方法,研究育苗基质对团花根腐病的抑制作用。结果表明:13#育苗基质明显降低团花根腐病的发生,对团花根腐病的相对防效达到93.1%。育苗基质对团花根腐病的抑制作用主要取决于育苗基质环境的物理作用、化学作用及根际微生物作用。育苗基质的密度、含水量与对团花根腐病的抑制呈负相关,育苗基质的持水孔隙度、交换性镁含量与根腐病的抑制呈正相关。根际真菌的数量与团花根腐病的发病率呈正相关关系,根际细菌的数量与对团花根腐病的发病率呈负相关关系。

An experiment was conducted to study the inhibitory effect of compost from agricultural organic waste used as nursery substrates on root rot of Anthocephalus chinensis with artificial pathogen inoculation. Results showed that 13# substrate sig- nificantly reduced the occurrence of root rot, and the relative control effect of root rot reached 93.1%. Inhibitory effect of the nursery substrate on root rot of seedlings depends on its physical and chemical role as well as rhizosphere microorga- nisms. Bulk density and water content of the nursery substrate are negatively correlated, while water-holding porosity and exchangeable magnesium content are positively correlated with the inhibitory effect of the nursery substrate on root rot. A positive correlation was observed between the number of rhizosphere fungi and the occurrence of root rot, while a negative correlation between the number of bacteria in the rhizosphere and the occurrence of root rot.