Effect of compound plant growth regulators on the flowering and fruit setting in litchi
With'Feizixiao'litchi as the plant material,four kinds of compound plant growth regulators were applied,including ethephon+paclobutrazol(T1),ethephon+uniconazole(T2),ethephon+paclobutrazol+oxyfluorfen(T3),ethephon+uniconazole+oxyfluorfen(T4),with clear water as control,to compare the effects of different treatments on the flowering rhythm,flower quantity,fruit setting and fruit quality in litchi.The results showed that,all the four kinds of compound plant growth regulators could significantly reduce the amount of male flowers,increase the rate of female flowers and the amount of fruit setting,but had little effect on fruit quality.Among these treatments,T4 had the best effect.After treatment,female flowers opened significantly earlier than 6 days,and the cumulative opening days of female flowers could be extended to 11 days.The amount of male flowers was only about 1/15 of the control.The rate of female flower was increased to 81.76％and the average number of panicle fruit set was increased to 12.00.In addition,the edible rate was increased by about 3～4 percentage points.The results of this study can provide theoretical basis for using plant growth regulators to improve the yield and quality of litchi.
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