迟熟蕉柑落花落果规律的观察研究

2006—2007年在广西桂林对迟熟蕉柑生理落花落果进行观察研究，探讨其落花落果规律。结果表明：2006年迟熟蕉柑的落花从4月中旬开始，4月下旬结束，4月11～15日和4月18～25日各有1次落花高峰期；2007年的落花从3月中旬开始，至4月中旬结束，落花高峰期在3月2913～4月2日。2006年迟熟蕉柑第1次生理落果从4月中旬开始持续到6月上旬，4月19—25日及5月7～14日为落果高峰期；第2次生理落果从5月上旬开始持续到7月上旬，5月17～23日为落果高峰期。2007年第1次生理落果从3月上旬开始持续到6月上旬，4月1-2日、4月15—17日、5月3-9日为落果高峰期；第2次生理落果从5月1日开始持续到6月上旬，5月4～11日和5月16～24日为落果高峰期。不同年份迟熟蕉柑的生理落果因气温变化剧烈程度不同而不同，两年的坐果率为2．42％-2．46％。

Observation on flower and fruit dropping in late-ripening variety of Jiaogan mandarins

An experiment has been conducted to elucidate the physiological mechanism of flower and fruit dropping in late-ripening variety of Jiaogan mandarins during the year 2006-2007. The results showed that in 2006, the flower dropping began from mid March to late April with the peak times, from March, 11-15 to April, 18-25. In 2007, the flower dropping began from mid March to mid April with the peak time from March, 29 to April, 2. In 2006, the first physiological fruit dropping was from mid April to early of June with the peak times of April, 19-25 and May, 7-14; the second physiological fruit dropping was from early of May to early of July with the peak time of May, 17-23. In 2007, the first physiological fruit dropping began from early March to early June with three peak times of April, 1-2, April 15-17, and May, 3-9; the second physiological fruit dropping was from May, 1 to early June, with two peak times of May, 4-11 and 16-24, respectively. The physiological fruit dropping in late-ripening variety of Jiaogan mandarins was varied with changes in temperature during different years, and the fruit setting rate was observed from 2.42% to 2.46% during these years.