Abstract: Using Guohaoyou No.8 as a test material,the effect of spraying paclobutrazol at different concentrations during the rape (Brassica napus L.) bud period was studied.The results showed that rapeseed could not only cultivate strong seedlings,improve plant type structure and yield characteristics,but also effectively solve the problem of rape lodging when spraying paclobutrazolin.The number of carob fruits per plant,the number of grains per grain,the weight of the rapeseed,and yield of Guohaoyou No.8 was increased by spraying with 1 500 grams of 15% paclobutrazol wettable powder per hectare during the bud period.

Key words: rape (Brassica napus L.), paclobutrazol, concentration, stem elongation period, economic traits, yield