Influence of Humic Acid and Mycorrhiza Fungi on Some Growth Characters and Elements Uptake in Speedygreen Perennial Ryegrass (Lolium perenne L.)

This experiment was conducted to study the effects of humic acid and mycorrhiza fungi on fresh and dry weight, visual quality, root colonization, and some nutrient uptakes such as Fe, Zn, K and P of ‘Speedygreen’ perennial ryegrass, in the research greenhouse of Tehran University in spring and summer of 2009. After soil autoclaving, the inoculums of mycorrhiza fungi including of G. mosseae and G. intraradices were added to pots, then seeds were sown. Humic acid at different levels (0, 100, 400, and 1000 mg L-1) was sprayed on leaves and the measurements were conducted nine weeks after starting of treatments. The results showed that the medium and high concentrations of humic acid increased the height, fresh and dry weight, and visual quality in non-mycorrhizal plants (control). Control plants had better nutrient uptakes in 400 mg/L. Both fungi had positive effects on measured characters. G. mosseae was better in medium concentration on nutrient uptake, colonization and visual quality, while height, fresh and dry weight on control plant in during time were more. Both fungi had positive effect on uptake of Fe, while control had better P uptake. K and Zn uptake were positive after time. Humic acid had no effect on root colonization.