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夏橙是世界柑桔的主栽品种。我国长江中上游中亚热带区是夏橙栽培的适宜区,但由于冬季气温偏低,1月均温8℃以下,自然落果率高。冬季喷布50PPm左右的2.4—D 2至3次,是夏橙果园防落的常规技术措施。但据生产实践,喷布2.4—D浓度稍高
Summer orange is the world’s main varieties of citrus. The middle and upper reaches of the Yangtze River in the subtropical region of summer orange cultivation is a suitable area, but due to the low winter temperatures, the average temperature in January 8 ℃ below the natural rate of fruit drop. Winter spray 50PPm about 2.4-D 2 to 3 times, summer orange orchard anti-fall conventional technical measures. However, according to production practice, spray 2.4-D concentration slightly higher