硅对烟草生长的影响及诊断指标研究

Hydroponic experiment with 5 silicon concentrations (0,0.5,1.0,2.0,3.0 mmol/L) was carried out to study the effects of silicon on tobacco growth and tobacco silicon nutrition diagnosis. The results indicated that tobacco silicon content increased with the increasing silicon concentration in culture solution. The silicon content of tobacco organs was in the order of root> leaves >stem, lower leaves > middle leaves > upper leaves. Tobacco middle leaves at topping stage was considered to be a proper part for silicon nutrition diagnosis. Compared with control, silicon treatment improved tobacco dry weight of aboveground and total biomass significantly at topping stage, but had no effect on tobacco growth at rosette stage. Silicon treatment increased the content of K, P and Zn, but decreased the content of N, Ca, Cu, Fe and B of tobacco. 148 tobacco leaf samples collected from major tobacco producing areas in Fujian province were tested. The results showed that the range and the average silicon content of tobacco was 0.04%-0.64% and 0.22% respectively, 52% samples silicon content was lower than 0.26%.