Effects of different fertilization ways on the contents of N, P, K in new shoots and photobiological characters of tea tree. Fate of Different Parts 13C-photoassimilates of Tianhong 2/SH40/Malus robusta Poplar Trees (Populus canadensis Moench) Initiate Vegetative Storage Protein Accumulation During New Shoot Development in Spring Fate of Different Parts 13C-photoassimilates of Tianhong 2/SH40/Malus robusta