桃树早期产量与栽植密度相关,所以生产性桃园一般采用密植栽培。但因没有适宜的矮化砧和生长势弱的品种,所以在成年期的桃园往往造成树冠的郁闭。修剪可控制树冠的大小,但影响产量。如能用一种化学生长调节剂抑制枝梢的延伸而不影响产量,这在密植桃园里将是很理想的。本文目的是测定在土壤里单独应用PP333后三年内对桃生长和产量的影响。 Early peach tree yield and planting density, so productive Taoyuan generally close planting. However, due to the lack of suitable dwarfing anvil and weak growing species, the adult can often cause canopy closure. Pruning can control the size of the crown, but affect the yield. It would be ideal if we used a chemical growth regulator to curb the extension of shoots without affecting yield. The purpose of this paper is to determine the effect on the peach growth and yield within three years of application of PP333 alone in the soil.