Abstract:

The effect of pure streptomycete S506 and synergistic agent application on rhizosphere microorganisms, biological character, production and quality of facility cucumber were studied after consecutive years of cultivation. The results showed that the S506′ application effects were enhanced significantly compared with CK when synergistic agents were added. The total amount of culturable rhizosphere microorganisms increased by 67.8% and the ratio of bacteria, actinomycete with fungi increased over five times. The root dry weight, root length, plant height, overground plant dry weight of cucumber seedlings raised by 61.5%, 22.6%, 31.2% and 69.9%, respectively. Their contents of soluble solid and vitamin C increased by 21.67% and 46.16%, respectively, while the nitrate content was decreased by 13.27%.The average yield of cucumber increased by 31.15%. The above results indicated that the streptomycete S506 had remarkable regulating effect on rhizosphere microorganisms and roots growth of cucumber, and its application would play significant effect on overcoming continuous cropping barrier in facility cucumber production.

Key words: Streptomyces sp.S506, cucumber, continuous cropping barrier, rhizosphere ecosystem, production traits

摘要：

在多年连茬设施黄瓜生产条件下,研究了链霉菌S506纯菌剂及纯菌剂添加增效剂后两个处理对黄瓜根际微生物区系、植株的生物学性状、产量和品质的影响。结果表明,S506纯菌剂添加增效剂后应用效果显著提高,与常规对照比较,黄瓜育成苗根际可培养微生物的总量增加67.8％,细菌、放线菌与真菌数量的比值提高5倍以上；黄瓜育成苗的根系干重、根长、株高和地上干重分别增加了61.5%、22.6%、31.2%和69.9%；黄瓜可溶固形物和维生素C的含量分别提高了21.67%和46.16%,而硝酸盐含量下降了13.27%；平均产量增加31.15%。表明,链霉菌S506对根际微生物和根系生长具有显著调控作用,对有效克服连作障碍对设施黄瓜生产的影响具有重要作用。

关键词: 链霉菌S506;黄瓜;连作障碍;根际生态;生产性状