Relationship between growth of mother trees of seed orchard of Cunninghamia lanceolata and soil nutrients.

Relationship between soil nutrient, yield, heighth of tree and chest diameter was studied by gradual regression and path analysis. The results slowed that 4 soil factors of organic mateer, hydrolytic nitrogen, rapid phosphorus and potassium could promote growth of heighth and chest diameter.Residual coeffiences of effects of 4 soil factors on yield, heighth and chest diameter were 0.032 86,0.440 5 and 0.483 6,respectively. This showed that, there were other relative factors not to be included.