The major part of summer pruning is the upper half of crowns of apple trees.
夏季修剪的主要部位是树冠的上半部。
Measures for protection to frost are proposed, including selecting favorable topography and frost-resistant cultivars, smoking and summer pruning.
提出预防霜冻的措施，主要包括：选择有利地形、选择抗霜冻品种、采取熏烟和夏季修剪等措施。
Summer pruning devitalises the tree on an extent and consequently reduces excessive vigour.
夏剪能在一定程度上减弱植株的生命力，从而削弱过分的生长势。
Summer pruning devitalises the tree on an extent and consequently reduces excessive vigour.
夏剪能在一定程度上减弱植株的生命力，从而削弱过分的生长势。
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