Abstract:

In order to search the reasonable rice seedling control method, an experiment was conducted to study the effects of different methods of spraying unicoazole on plant height, chlorophyll content, root length, root number and root activity, four uniconazole level （C0, 0 mL/L; C1, 25 mL/L; C2,50 mL/L; C3, 100 mL/L） and three spraying time （T0, 0 d seedling age; T1, 5 d seedling age; T2, 10 d seedling age） were set up, using Huayou 2 as material. The results showed that the spray of uniconazole significantly reduced the plant height of the seedlings, the higher the spray concentration, the better the seedling control effect. The control effects of seedlings were weakened when spraying time was delayed. The high concentration of uniconazole reduces the chlorophyll content of the seedlings. Spraying Uniconazole significantly increased the root length, root number and root activity. But if the concentration is too high, it will restrain the growth of roots. According to the plant height, chlorophyll content, root length, root number and root activity, the treatment of T1C2 was the best for improving the quality of the seedlings.

Key words:  uniconazole, spraying method, matrix seedlings raising, seedling quality

摘要：

为探究合理的秧苗调控方式，以华优2号为试验材料，设置不同烯效唑喷施浓度（C0，0 mL/L，喷施等量清水；C1，25 mL/L；C2，50 mL/L；C3，100 mL/L）和喷施时期（T0，播种时；T1，5 d秧龄；T2，10 d秧龄），研究了不同烯效唑喷施方式对无土基质育秧秧苗株高、叶绿素含量、根系长度、根系数量、根系活力等的影响。结果表明，喷施烯效唑显著降低了秧苗株高，喷施浓度越高，控苗效果越佳，喷施时间推迟控苗效果减弱；烯效唑浓度过高会降低秧苗叶绿素含量；喷施烯效唑可显著增加秧苗根长和数量，并增强秧苗根系活力，但浓度过高则抑制根系的生长。综合秧苗株高、叶绿素含量、根长、根数及根系活力等指标，播种后5 d喷施50 mL/L稀效唑（T1C2）对秧苗素质提升效果最佳。

关键词: 烯效唑, 喷施方式, 基质育秧, 秧苗素质