多效唑培育油菜壮秧及提高产量的效果

EFFECTS OF PALCOBUTRAZOL(PP 333)ON GROWING VIGOUROUS RAPE SEEDLINGS AND INCREASING RAPESEED YIELD

油菜秧苗使用多效唑,能促使叶色深绿,叶片增厚,总叶数和绿叶数增加,叶柄变短,根颈增精,根系发达,明显呈现出矮健粗壮的长势。经测定,植株含糖量增加,干物重提高,细胞结构排列紧密,组织发达,充分表现出壮秧的生理基础。越冬至开春阶段,生长速度加快,长势旺盛,表现为绿叶数、叶面积、苔高、茎粗、根预粗等均高于对照,且花芽分化势强,表明具有冬壮春发的效应。油菜在2—3叶期,喷100-200ppm 多效唑,有10%～17.5%的增产效果,达到1%的显著性差异,其增产原因,主要是单株角果数的增加。

The authors' experiment showed that spraying palcobutrazol (PP_(333)) upon rape seedlings might make leaf color darker,leaf blade thicker,total number of leaves per plant greater,chlorophyll content higher,leaf stalk shorter,root collar thicker,root system more developed and shoot-root ratio smaller as compared with control (non-sprayed) seedlings.The results of determination indicated that carbohyd- rate content and dry weight per plant of sprayed plants were higher than those of con- trol seedlings.The sprayed plant had cellular seructure closely arranged and tissues well developed.They were consistently more vigourous than the control plants from winter to spring.Their flower bud differentiation was also stronger.The experiment proved that rape seed yield of plants sprayed with 100—200 ppm PP_(333) at 2 or 3-leaf stages was 10.0—17.5% higher than that of the control plant with significant diffe- rence at the 1% level.The main reason of higher seed yield of sprayed plants was that siliqua number per plant increased as compared to that of control plants.