Height Growth Response of Superior Provenance of Masson Pine to Different Phosphorus Supply

Five Pinus massoniana superior provenances were used to test the interaction of P.massoniana and phosphorus fertilizer on low fertility and phosphorus deficient site,and to study the response of height growth to different phosphorus supply.The results showed that the response pattern of height growth varied with the provenances tested.Some provenances were more sensitive than the others.There existed significant differences among provenances in the response and the effectiveness for a given period of time.The fertilization principles for young stand of different provenances were made according to various response of each provenance to phosphorus supply.It was found that the genetic variation of height growth among provenances was correlated with the phosphorus condition.Proper phosphorus supply could improve the preciseness of provenance test significantly.For the high yielding plantation,the interaction of provenance and phosphorus could not be ignored,in spite of its less importance as compared with provenance effect and phosphorus effect.