Branch -drooping could significantly retard growthvigour of Delicious apple trees, promote flower bud formation, and raise fruiting rate.
拉枝能显著抑制‘元帅’苹果幼树旺枝的生长势，促进花芽的形成，提高坐果率。
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Fine strains JW1and JW3 were bred through comparing their property of growth rate, mycelium growthvigour, fruit body morphology, amino acid compositions and yields with their parents.
The significant yield increase of virus-free sweet potato mainly resulted from its strong growthvigour, early formation of its tuber, increase of big tuber in number and weight in harvest period.