华南农业大学：《园艺植物栽培学》课程教学课件（PPT讲稿）第七章 园艺植物的植株管理.ppt

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Now, to which bud should you cut? Trees have buds at various places on their limbs ◼ Look for an out side bud and cut just above it ◼ Limb or twig growing from an out side bud tends to grow out ward and upward, whereas one form an inside bud tends to grow inward

Now, to which bud should you cut? Trees have buds at various places on their limbs ◼ Look for an out side bud and cut just above it ◼ Limb or twig growing from an out side bud tends to grow out ward and upward, whereas one form an inside bud tends to grow inward

Bud "b"removed; b bud "a"grows inward into plant canopy 0 b Pruning above bud"b" causes new branch to grow outward to open up plant canopy Direction of potential bud growth

4.3.2 Removal of a branch ◼ For small branches: use shears ◼ For large branches: use saws One danger is that the branch’s weight will cause it to fall away just before you complete the cut, breaking and splitting back into the next branch or into the trunk of the tree. To prevent this: A. Middle large branches: Support the branch with one hand while you saw with the other B. Too large and heavy branches: Use three pruning cuts: cut in tow or more steps

4.3.2 Removal of a branch ◼ For small branches: use shears ◼ For large branches: use saws One danger is that the branch’s weight will cause it to fall away just before you complete the cut, breaking and splitting back into the next branch or into the trunk of the tree. To prevent this: A. Middle large branches: Support the branch with one hand while you saw with the other B. Too large and heavy branches: Use three pruning cuts: cut in tow or more steps

For small branches: use shears ◼ How to position pruning shears: for the cleanest cut, be sure the blade side of shears is closest to the portion of the stem that will remain on the plant. The blade side Hook Wrong Correct

For small branches: use shears ◼ How to position pruning shears: for the cleanest cut, be sure the blade side of shears is closest to the portion of the stem that will remain on the plant. The blade side Hook Wrong Correct

Three pruning cuts: ◼ First, make a cut from underneath about 6 inches out from the trunk ◼ Then cut off the branch one inch beyond the udercut ◼ Finally, cut off the branch stub at the proper angle

Three pruning cuts: ◼ First, make a cut from underneath about 6 inches out from the trunk ◼ Then cut off the branch one inch beyond the udercut ◼ Finally, cut off the branch stub at the proper angle

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