脐晚脐橙落花落果规律的观察研究

2008～2009年在广西桂林对脐晚脐橙落花落果规律进行观察研究,为制定适宜的保花保果技术措施提供依据。结果表明,2008年脐晚脐橙落花从4月上旬持续到4月下旬,4月11～12日和4月16日各有1次落花高峰;第1次生理落果从4月下旬持续到5月下旬,5月2～4日和5月8～10日各有1次落果高峰;第2次生理落果从5月中旬持续到6月上旬,5月11～15日为落果高峰期。2009年脐晚脐橙落花从3月下旬持续到4月下旬,3月24日～4月8日为落花高峰期;第1次生理落果从4月下旬持续到5月下旬,4月21日～5月15日为落果高峰期;第2次生理落果从5月中旬持续到7月中旬,5月6～24日为落果高峰期。两年的坐果率为0.5%～3.9%,脐黄落果率为59.5%～71.7%,裂果率为0.7%～2.3%。

Blossom and fruit dropping rule of Qiwan navel orange

In order to take suitable technologies for blossom-keeping and fruit-keeping,an experiment has been conducted to investigate the rule of blossom and fruit dropping in Qiwan navel orange during 2008-2009.The results showed that in 2008,the blossom dropping began from the first ten-day to late ten-day of April with two peaks at 11th-12th and 16th.The first physiological fruit dropping began from late ten-day of April to late ten-day of May with two peaks at 2th-4th May and 9th.The second physiological fruit dropping began from mid ten-day of May to late ten-day of June with peak at 11th-15th May.In 2009,the blossom dropping began from late ten-day of March to late ten-day of April with peak from 24th March to 8th April.The first physiological fruit dropping began from late ten-day of April to late ten-day of May with peak from 21th April to 15th May.The second physiological fruit dropping began from mid ten-day of May to mid ten-day of July with peak at 6th-24th May.The average fruit setting rate ranged from 0.5 to 3.9% and navel yellow rate of orange ranged from 59.5 to 71.7% and fruit cracking rate ranged from 0.7% to 2.3% in 2008-2009.