[Effects of P fertilizer on female strobilus and needle N and P nutrition of clones with different fruiting abilities].

In order to realize precise fertilization and high yield management of clonal seed orchard, clones with different fruiting abilities were used as the materials. Four P fertilization levels were at 0, 400, 800 and 1600 g per plant (P, P, P and P respectively). Fertilization was applied before floral primordia formation and after cone picked, respectively.