Abstract:

The study aws carried out under noncontrolling conditions in FenyiCountry, Jiangxi Province(27°52′N, 114°45′E, about 100m altitude).During the growing season in 1994, Pt inoculated and noninoculated seedlings were fertilized with the 4 different relative addition rates.I.e.0%, 5.3%, 6.4%, 7.5%, according to the theory of the steady state mineral nutrition.The results showed that there was a atatistic significant difference between inoculated and noninoculated seedlings in height growth, radial growth, and dry matter accumulation in the 7.5% treatment.The maximum values were found for inoculated seedlings in 7.5% treatment, which were 26.4%, 52.5%, 140.2% respectively higher than its control (0% ).While these were only 21%, 16.7%, 54.1% for noninoculated seedlings in 6.4% treatment, which were inhibited in the 7.5% treatment.The seedlings inoculated with Pt in 7.5% treatment had formed Pt ectomycorrhizae amounting to 97%, Pt index up to 95.1, At the same time, the length of tqp root, the total length of first-class lateral roots, as well as N、P concentration and their contents in the needles of the seedlings in this treatment were higher than those in other treatments, N use efficiency of the inoculated seedling in 7.5% treatment was 2.7 fold higher than that of the noninoculated seedlings in the same nutrient treatment, indicating that the 7.5% telative addition rate of mineral nutrients was suitable for ectomycorrhizae formation of container-grown slash pine seedling under this experimental conditions, which promoted the absorption and utilization of the mineral elements.The amount of fertilizer per seedling was about 39.27mg N, 19.64mg K, and 707mg, P, N:K: P=1:0.5:0.18.

Key words: Pinus elliottii, Pt ectomycorrhiza, Steady state mineral nutrition, Nutrient relative addition rate, Growth