苹果树大枝的疏除,有的果园习惯在果树落叶后至发芽前这段时间进行。我们通过在本县17个果园进行疏除大枝时间的对比试验,以改进以往的技术。一、疏除大枝的时间。据试验结果,疏枝最佳季节是从采果后到落叶前的这段时间。因为,这段时间叶片齐全,树冠的通风透光情况最易掌握,不易出现疏漏。疏除大枝后,树冠的光照得到改善、叶片功 Sparse branches of apple trees, and some orchards in the habit of deciduous fruit trees before the period of time. We conducted a comparative test of sparsely populated branches in 17 orchards in our county to improve our technology in the past. First, sparse big branches of the time. According to the test results, the best season for thinning branches is from the time after picking fruit to deciduous leaf. Because, during this time the leaves are complete, the crown of the ventilation and light of the most easy to grasp, not prone to omissions. After the removal of the big branches, the light of the canopy is improved and the leaves worked