Neilson脐橙落花落果习性研究

[目的]为Neilson脐橙保花保果提供理论依据。[方法]2008～2009年,在广西桂林选择树势中庸一致的2株Neilson脐橙果树统计其落花落果、脐黄落果和裂果的数量。[结果]2008年Neilson落花从4月上旬持续到4月下旬,2次落花高峰期分别为4月7～14日和4月16日;第1次生理落果从4月下旬持续到5月下旬,第2次生理落果从5月中旬持续到6月下旬,落果高峰期为5月1～4日、5月9日、5月11～15日。2009年落花从3月下旬持续到4月下旬,落花高峰期为3月24～4月8日,第1次生理落果从4月下旬持续到5月下旬,第2次生理落果从5月中旬持续到7月中旬,落果高峰期为5月6～24日。Neilson脐橙的坐果率为0.39%～1.10%,脐黄落果率为33.6%～55.6%,裂果率为7.1%～14.5%。[结论]该研究明确了Neilson脐橙的落花落果规律。

Research on Blossom Dropping and Fruit Dropping Characteristics of Neilson Navel Orange

[Objective]The purpose of the research was to supply theoretical basis for blossom and fruit protection of Neilson navel orange.[Method]In 2008-2009,2 Neilson navel orange trees with moderate growth potential in Guilin of Guangxi were selected for calculating the quantities of dropped blossoms and fruit,dropped navel-yellowing fruit and divided fruit.[Result] In 2008,the blossom dropping of Neilson was continued from early Apr.to late Apr.,the 2 peak periods of blossom dropping were the period from 7th to 14th Apr.and 16th Apr.;the 1st physiological fruit dropping was continued from late Apr.to late May and the 2nd physiological fruit dropping was continued from middle May to late Jun.,its peak periods of fruit dropping were the period from 1st to 4th May,9th May,the period from 11th to 15th May.In 2009,the blossom dropping was continued from late Mar.to late Apr.,the peak period of blossom dropping was the period from 24th Mar.to 8th Apr.,the 1st physiological fruit dropping was continued from late Apr.to late May and the 2nd physiological fruit dropping was continued from middle May to middle Jul.,its peak period of fruit dropping was the period from 6th to 24th May.The fruiting rate of Neilson navel orange was 0.39%-1.10%,the navel-yellowing and fruit dropping rate was 33.6%-55.6% and the divided fruit rate was 7.1%-14.5%.[Conclusion] The blossom dropping and fruit dropping regularity of Neilson navel orange was confirmed in this research.