采用间比法,在含2,4-D,“九二○”、杀菌剂、叶面肥等保果剂的6种处理下,调查了鲍威尔、班菲尔、切斯勒特脐橙在重庆市奉节县铁佛果园的冬季落果情况.结果表明,11月上旬、12月上旬喷2次2,4-D 30 mg/L或2,4-D 20 mg/L+“九二○”10 mg/L,降低晚熟脐橙的冬季落果效果较好,至翌年3月上旬试验结束,喷2次保果剂后落果率在6％以内,仅为对照的1/3.对引起落果的原因进行了初步分析,低温是影响落果的主要原因.%In this study, winter fruit-drop was surveyed among Powell, Bamfild and Chislett navel orange in Fengjie Tiefo orchard, Chongqing, China after the treatment of six kinds with fruit retention agents (including 2,4-D, GA3 , fungicides and foliar fertilizer) by interval contrast. Results showed that fruit retention agents(with 2,4-D 30mg/L or2,4-D 20mg/L＋GA3 10mg/L) , which was sprayed in the early November and December, could reduce significantly winter fruit-drop percentage, and to the early March of the following year, the fruit drop percentage was less than 6% , moreover, it was only 1/3 compared with control. The preliminary analysis showed the main reason of fruit-drop was low temperature in winter.
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