Abstract:In order to screen out the optimal media formula for Mytilaria laosensis container seedling, the effect of different proportion of yellow soil and light media on the growth and chlorophyll fluorescence characteristics of container seedlings was investigated. The results showed that the seedling height, root diameter and total biomass tended to increase at first and then decrease with the increment of light media proportion, reaching up to the peak grown in T5 media (yellow soil:light media=5:5), which were 3.60, 1.97 and 13.5 times more than those of control (yellow soil), respectively. Except of length of main root, the root indicators grown in all media were larger than those in control. With the increment of light substrate proportion, the total length, surface area and volume of seedlings root in all media increased at first and decreased later, and the peak appeared in T5 media. The average diameter of seedling root generally increasd with the increment of light media proportion. Among all media, the initial fluorescence (Fo) of seedlings grown in T5 was the smallest, and the maximum fluorescence (Fm) and PSⅡ maximum photochemical efficiency (Fv/Fm) in T5 were the largest, showing the highest photochemical capacity. Therefore, the growth of M. laosensis container seedlings was the best in T5 media (yellow soil:light media=5:5), it was suggest that the mixture media with 50%-60% of light media could be used as container nursery media for M. laosensis.
