实践证明,适量使用九二○(赤霉素)保花保果效果良好,但如使用不当,弊害也十分明显,必须加以注意。九二○能减少柑桔的生理落果,尤其在无核、少核的南丰蜜桔上使用增产保质效应更好。但对其使用要求比较严格,使用浓度过高或次数过多,反而会造成果实成熟推迟,果皮变粗增厚,果肉不 Practice has proved that the appropriate use of 920 (GA) Paul Paul fruit and fruit is good, but if used improperly, the disadvantages are also very obvious, we must pay attention. September 20 can reduce the physiological decline of citrus fruit, especially in the non-nuclear, less nuclear Nanfeng tangerine to use yield-saving effect is better. However, the use of its more stringent requirements, the use of too much concentration or the number of times, but will result in postponement of fruit ripening, peel thick thickening, flesh is not