Studies On The Growing Substrate For Transplanting Tissue Culture Seedlings Of Populus× Euramericana

Demonstration Base, we selected the tissue culture seedlings of Populus X euramericana(Dode) Guineircl as the material. Several substrates were tested as the growing substrate for the seedling. The results showed that seedling growth was excellent for the peat moss from northeast of China + vermiculite, the pure peat moss from China, the peat moss from northeast+ammonium fertilizer + NRS fertilizer. They were nearly as good as the Finland peat moss. But the single peat moss from the northeast + perlite was bad, and adding the ammonium fertilizer was worse. The more fertilizer the lower growth for the seedling. The Finland peat moss showed the best. Perlite showed bad effects. Vermiculite showed better effect and greatly promoted the growth of the seedlings. This maybe relate to its good physical quality. The physical and chemical of these substrates have been analyzed, the results showed that the value of maximum water absorbing rate of those good substrates was high and the substrate weight was low. Their particles were mainly in 1-2 mm diameter and only a few of them less than 1 mm. The pH of substrate was negatively related to the growth of seedlings and that showed the acid environment was suitable to seedling growth. The optimum value was 3.50-5.65. The suitable content of quick result nitrogen was 969.6mg/kg~2492.6mg/kg and phosphorus as 65.5mg/kg~486.9mg/kg. The content of quick result potassium of Finland peat moss was much higher than that of national peat moss, and the suitable value was 174.2mg/kg~1386.0mg/kg. The content of quick result iron of substrate was much more different greatly between national's and the Finland's substrate. The national's was too high. The suitable value was 175.7mg/kg~1645.5mg/kg. The content of quick result boron of Finland peat moss was much higher than the national's .The suitable value was 0.9mg/kg~4.5mg/kg.