板栗密植园如何控制树冠缓慢扩展,或将近郁蔽时缩小更新,是保持植株生机旺盛,延长盛果期年限的重要工作,本试验以回缩修剪为重点进行了探讨。 试材为株行距2×3米的12年生树和株行距1×2米、1 ×1.5×3米及1×1.5×3.5米的8年生树。设:全株大枝回缩;全株间枝回缩;全株大枝回缩 How to control canopy chestnut plantation slowly expanding, or narrowing when the update is close, it is to maintain vigorous plants, to extend the full fruit period of the important work, the test to focus on the retracted pruning were discussed. The test materials were 12-year-old trees with a row spacing of 2 × 3 meters and 8-year-old trees with rows spacing of 1 × 2 meters, 1 × 1.5 × 3 meters and 1 × 1.5 × 3.5 meters. Set: whole plant retraction; whole plant branch retraction; whole plant retraction