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[目的]通过田间试验评价供试药剂对水稻的生长调节和增产效应。[结果]不同药剂处理第4、5节间长分别为7.4~15.8 cm和15.1~20.9 cm,不施药处理分别为21.0、14.4 cm。75%赤霉酸结晶粉减产39.4%,其他3种供试药剂增产6.2%~14%。[结论]430 g/L戊唑醇SC、75%肟菌酯?戊唑醇WG、75%赤霉酸结晶粉和0.02%芸苔素内酯AS能抑制第4节间伸长,加速第5节间伸长,对叶绿素和旗叶叶面积提高不显著,对稻米胶稠度影响显著,能降低垩白度和垩白率,对精米率、直链淀粉等指标无显著影响。
[Objective] The field experiment was used to evaluate the effects of test agents on rice growth regulation and yield increase. [Result] The lengths of sections 4 and 5 of different treatments were 7.4 ~ 15.8 cm and 15.1 ~ 20.9 cm, respectively. The non-application treatments were 21.0 and 14.4 cm respectively. The yield of 75% gibberellic acid crystal powder was reduced by 39.4% while that of the other three kinds of test chemicals increased by 6.2% ~ 14%. [Conclusion] 430 g / L tebuconazole SC, 75% Trifloxystrobin, tebuconazole WG, 75% gibberellic acid crystal powder and 0.02% brassinolide AS could inhibit the fourth internode elongation, 5 internode elongation, the chlorophyll and flag leaf area increased insignificantly, had a significant effect on the gel consistency of the rice, can reduce the chalkiness and chalky rate, and had no significant effect on the milled rice rate, amylose and other indicators.