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连续3年调查了无病毒乔纳金苹果幼树的生长结果表现及其光合速率和生物产量形成。无病毒乔纳金苹果幼树的年生长量比对照明显增大，且成花早、结果多、果实质量好，叶片的光合功能和生物产量形成亦比对照显著提高。
For 3 years in a row, the growth performance, photosynthetic rate and biomass production of virus-free Jonathan apple tree were investigated. Compared with the control, the annual growth of virus-free Jonathan apple saplings was significantly higher than that of the control, and the result was early flowering with more fruits and better fruit quality. The photosynthetic function and biomass yield of the leaves were also significantly increased compared with the control.