多效唑对盆栽大丽花的矮化作用

On Shortening Effect of PP333 on Dahlia pinnata Planted in the Pots

在6－8月间，采用质量分数为5×10^-5,1×10^-4,2×10^-4的多效唑对大丽花地上部分喷施。结果表明，多效唑对高科、中科、矮科3类型大丽花均有明显的矮化作用，但质量分数在5×10^-5以上多效唑对大丽花茎粗有负面效应；多效唑对花芽分化，提早开花有促进作用，对分枝和节数生长作用不明显。多效唑对盆栽大丽花有较好的矮化作用 。

Mass concentration of PP 333 with 5×10 -5 ,1×10 -4 and 2×10 -4 weight content was sprayed upon Dahlia pinnata planted in the pots, and results were as follows: the high, midium and short varieties of Dahlia pinnata showed significantly shortening effect;PP 333 can promote the differentiation of flower buts and blooming in advance, and did not indicate obviously effect on the branching and the growing of “joint between” of Dahlia pinnata ,moreover,PP 333 with more than 5×10 -5 restrained the growth of stem diameter.