〔1State Key Laboratory of Vegetable Biobreeding，Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2 China Vegetable Biotechnology Co.，Ltd.（Shouguang），Shouguang 262700，Shandong，China；3 Shouguang Agriculture and Rural Bureau，Shouguang 262700，Shandong，China；4 Yantai Institute of China Agricultural University，Yantai 264032，Shandong，China〕
Abstract：Taking the new variety of‘eggplant 1055’ as test material，this paper explored the effects of paclobutrazol spraying concentrations and times of application on eggplant plant height，internode length and fruit characters under different cultivation modes.In spring at open fields，this experiment set up 6 spray
concentrations（0 as CK，25，50，100，200，300 mg·L-1）and one spray frequency（3 times）altogether 6 treatments. In autumn at solar greenhouse，5 spray concentrations（0 as CK，25，50，100，150 mg·L-1）and 3 spray frequency（1，2，3 times）were set altogether 11 treatments. The results showed that under different environments paclobutrazol could all hold up the growth of eggplant plant.Along with the increase of paclobutrazol concentration and number of application times，plant height and internode length would gradually decrease. At the same time，paclobutrazol spraying would affect the development of eggplant fruit，increase fruit transverse diameter and decrease fruit longitudinal diameter. Along with time extension after spraying，the effect of paclobutrazol would gradually weaken. Comprehensive analysis about effects of paclobutrazol on eggplant plant architecture and fruit characters showed that 15 days after field planting，spraying paclobutrazol 50 mg·L-1 3 times in open field cultivation in spring，and spraying 25 mg · L-1 3 times in solar greenhouse cultivation in autumn with 7 days interval could effectively reduce eggplant plant height and internode length，maintain its fine fruit type and increase its single fruit weight.
