关键词: 链霉菌S506;黄瓜;连作障碍;根际生态;生产性状

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