藥劑處理對加工番石榴產期調節之研究

The Use of Chemicals for Regulating Production Periods in Processing Guava

加工番石榴品種以中山月拔為供試材料，試驗採用三種藥劑各稀釋二種濃度下處理，發現不同氣候下各處理間對促進落葉效果與產量有關。其中採用46%尿素25%濃度者，植株落葉率達78.11%，枝條損傷嚴重，新稍乾枯程度平均達47.85cm長，而以益收生長素0.2%較為適宜，產量也較高，平均每株達55.2kg，果粒重101.8gm。各處理間品質差異不甚研顯。

Five-year-old 'Chung-San Monthly' guava plants were sprayed with Ethrel and urea at 2 different concentrations to regulate the production period. The chemicals were treated on 8 different dates during a 2-year period. Treatment of 25% urea caused 78% of defoliation, severe twig damage and serious die-back of new shoots. Among the 6 treatment, Ethrel at 0.2% concentration is recommended due to less damage to the plants and higher yields. Concerning the fruit quality, there was no significant difference among various treatments.