关键词: 姜瘟病, 土壤养分, 环境因子, 相关性, 多元线性回归

Abstract: [Objective] The aim of the study was to investigate the relationship between ginger wilt and soil nutrients and environmental factors under the field conditions, and to determine their effects on the ginger wilt. [Method] Two treatments of field experiment, conventional cultivation (T1)and soil water content control during the final growth stage by covering plastic film (T2), were performed in Qianwei county in 2012 and 2013. Each treatment had 6 replicates. The ginger wilt incidence, soil water content, soil temperature and nutrients were monitored. Multiple linear regression analysis was used. [Results] The ginger wilt incidence was correlated significantly positively with soil moisture content and available phosphorus content. Likewise, ginger wilt incidence was positively correlated soil temperature. Multiple linear regression analysis showed that when water content was high (T1), soil temperature was the most predominant factor affecting ginger wilt incidence. The optimal regression model was:ginger wilt incidence=-2 108.12+3.99×wc+71.95×t+1.16×AP-0.31×AN (R²=0.881, P=0.001). However, when soil water content was low (T2), soil water content became the most predominant factor. The optimal regression model was:ginger wilt incidence=160.05+7.12×wc-1.70×t+1.08×AP-0.30×AN (R²=0.634, P=0.03). [Conclusion] Soil water content, temperature, available phosphorus content were the dominant factors affecting the occurrence of ginger wilt. The critical value of soil water content when the ginger wilt disease occurred was 24% in Qianwei.

Key words: ginger wilt disease, soil nutrient, environmental factors, correlation, multiple linear regressions