Effects of Different Control Measures on Cucumber Yield,Quality and Soil Microbial Diversity Under Greenhouse Cultivation

Abstract

In order to research the effects of different control measures on soil microbial diversity by Biolog, the greenhouse soils of cucumber cultivated in Shouguang City, Shandong Prorince were collected and the relationship between the soils and yield and quality of cucumber was investigated. The results showed that, the average well color development (AWCD) of returning straw to field (RS) was the highest and that of no fertilizer (CK) was the lowest. The activity of microbe was vigorous at the time of cultivation of 72 h and AWCD of treatments ranged from 0.494 to 0.881. AWCD of RS was 1.3 times than that of conventional fertilization (CF) and the difference reached significant level at the moment. However, AWCD of drip irrigation (DI) was lower slightly than that of CF. Soil microbial diversity changed in different treatments.CF had the lowest Shannon index(H)and Substrate evenness(E), but these two indices increased significantly through the application of RS and DI. Principal component analysis showed that carbon utilization by soil microbial communities also changed in different treatments. RS concentrated in the positive direction of the first principal component and the score coefficients ranged from 4.91 to 5.50. Conversely, others concentrated in the negative direction and the score coefficients ranged from-3.26 to-0.18. Compared with CF, cucumber yield and quality of RS and DI treatments had no significant changes. Simpson′s dominance (Ds) and Substrate richness(S)were positively correlated with cucumber yield, Vc and soluble sugar content. Comprehensive consideration, RS was more helpful to improve the soil micro-ecological envrion-ment than DI. Therefore, future research of RS is necessary for sustainable development of installation agriculture.