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<< Basically, in June, when the trees begin to blossom, Wang irrigates,
eliminates weeds and sprays insecticide. He also cuts off the trunk bark
in the middle of every tree to ensure that the upper part gets more
nutrition, which produces more flowers and, ultimately, more jujubes.  >>

Should we be cutting the bark on our hybrid plum trees to stimulate them to 
carry more fruit?   In a very early Pomona [e.g. 1971] a professor was quoted 
saying poor bearing in plums was due to inadequate nitrogen in the flower 
stem, 
maybe cutting the bar would ensure more nutrition in the upper part.  Sounds 
like its worth a try.  Is that when to do it, June?
Charlie Paradise in Massachusetts