Abstracts |
In a pot experiment carried out in 2000, the effect of AM fungi and phosphorus levels on quality of tobacco (variety NC89) leaf was studied. The strains of arbusular mycorrhiza, GM (Glomus mosseae) and G89 (G. caledonium), were inoculated on pasteurised soil. The amounts of nitrogen and potassium applied were 0.25 and 0.25 g/kg, respectively. The 5 phosphorus levels were 0, 0.056, 0.112, 0.224, and 0.448 g/kg. Inoculation of AM promoted mycorrhizal infection. The quality of tobacco was affected significantly by AM inoculation. The contents of total sugar, nicotine, phosphorus (P), and potassium (K) in leaves increased after inoculation, but the contents of iron (Fe), zinc (Zn) and the ratio of N/alkali as well as the ratio of sugar/alkali decreased. Some differences were observed between the two strains. Inoculation of GM increased the contents of total N, protein, and magnesium (Mg), but decreased the content of reducing sugar while inoculation of G89 decreased the content of total N, protein, and Mg, but increased the content of reducing sugar. The amount of P applied had some effects on chemical composition of leaves. Inoculation combined with application of P2O5 at 0.056 g/kg was nearly the same as no inoculation combined with application of P2O5 at 0.112 g/kg for chemical composition. It is concluded that better quality of tobacco leaves can be obtained with inoculation of AM at low levels of P.. |