果樹修剪英文版ppt課件-資料下載頁
2025-01-13 14:48本頁面
【正文】 on of apical dominance ?Controlled by the plant hormone auxin ?Produced by actively growing shoots ?Moves down the branch with gravity Effects of auxin ?Inhibits lateral bud break ?Inhibits lateral shoot growth ?Affects branch angle Pruning Remove the Source of Auxin ? Heading Cut ?Remove part of the branch ?Stimulate bud break near cut ?Stimulate localized branching Pruning Remove the Source of Auxin ? Thinning cut ?Remove branch at point of origin ?Least invigorating cut ?Promote light peration into canopy ?Maintenance pruning Bend Branch Towards Horizontal ? Decreases amount of auxin moving from tip Increase lateral branching Decrease terminal growth Bend to a 45 to 60 degree angle Bend Branch Towards Horizontal ? Decreases amount of auxin moving from tip Increase lateral branching Buds at highest point break Decrease terminal growth Bend below the horizontal Timing of pruning ? Dormant pruning ? Most mon approach ? Summer pruning ? Works well in bination with dormant pruning ? Open up the tree to allow light into center Pruning Response Varies with Tree ? Different varieties/crops grow differently ? Spur types in apples ? Vigor level of the tree ? Age of the tree ? Rootstock ? Fertility/irrigation/soil constraints ? Small fruited vs. large fruited crops
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