不同保果处理对晚熟脐橙冬季落果的影响

Effect of Different Fruit Protecting Treatment on Winter Fruit-drop of Late-maturing Navel Orange

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, Cbengqing, China after the treatment of six kinds with fruit retention agents （ including 2,4-D, GA3 , fungicides and foliar fertilizer） by in- terval contrast. Results showed that fruit retention agents（with 2,4-D 30mg/L or 2,4-D 20mg,/L ＋ GA3 10rag/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.