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Groupe de Marion Touzot Ostéop

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Pruning And Training: What, When, And How To Prune __HOT__

Training and pruning are essential for growing fruit successfully. Fruit size, quality and pest management are influenced by training and pruning. Untrained and unpruned trees become entangled masses of shoots and branches that produce little or no fruit and harbor insects and diseases.

Pruning and Training: What, When, and How to Prune


Heading-back cuts may stimulate new growth near the cut. If the trees are heavily pruned, reduce the amount of fertilizer applied in relation to the severity of pruning. Heavily pruned trees may not need fertilizer for a year or two.

Many people will purchase a house where an apple tree was planted on the property several years ago. Often, the previous owners did not take the time to properly prune the tree. The tree has become bushy and weak and will produce very poor quality apples. Such a tree requires extensive corrective pruning.

Stone fruit trees are also very susceptible to a disease called Cytospora canker. If pruned in late winter, the tree cannot protect the pruning wounds from infection by this disease. Prune your trees from budswell through petal fall in the spring. Your goal is to develop a vase-shaped tree with no branches in the center.

Apply the prune_low_magnitude() API to prune the whole pre-trained model to demonstrate and observe its effectiveness in reducing the model size when applying zip, while maintaining accuracy. For how best to use the API to achieve the best compression rate while maintaining your target accuracy, refer to the pruning comprehensive guide.

Next, we apply both QAT and pruning-preserving QAT (PQAT) on the pruned model and observe that PQAT preserves sparsity on your pruned model. Note that we stripped pruning wrappers from your pruned model with tfmot.sparsity.keras.strip_pruning before applying PQAT API.

In this tutorial, you learned how to create a model, prune it using the sparsity API, and apply the sparsity-preserving quantization aware training (PQAT) to preserve sparsity while using QAT. The final PQAT model was compared to the QAT one to show that the sparsity is preserved in the former and lost in the latter. Next, the models were converted to TFLite to show the compression benefits of chaining pruning and PQAT model optimization techniques and the TFLite model was evaluated to ensure that the accuracy persists in the TFLite backend. Finally, the PQAT model was compared to a quantized pruned model achieved using the post-training quantization API to demonstrate the advantage of PQAT in recovering the accuracy loss from normal quantization.

Fruit from Florida's early maturing peach, nectarine, and Japanese plum cultivars mature in April and May. However, after the fruit is harvested, trees grow vigorously until about November. Trees must therefore be pruned annually to enhance tree growth, reduce fruit thinning costs, and adjust crop load for the following season. During the first two to three years after planting, young trees are trained to develop a branching system or tree canopy that will later support a well distributed crop. Mature, producing trees from about three to ten years of age are usually pruned when dormant (December to February) and during the late spring and summer (May to August). Although each tree will grow differently with few trees being perfectly symmetrical, the overall goal for peaches and nectarines is to develop an open center or vase-shaped tree with a spreading but upright growth habit (Figure 1) and to train Japanese plums that would typically grow very upright to a somewhat spreading pattern (Figure 2). Written for both homeowners and commercial growers, this publication explains concepts underlying recommended tree training and pruning practices.

Nursery trees with trunks less than 3/8 inch in diameter usually have no lateral branches and can be cut back 18 to 24 inches above ground level. Primary or scaffold branches will develop six to ten inches below this cut. These scaffold branches need to be developed low to make pruning, thinning, and fruit harvesting operations easily accessible from the ground or scaffold branches high enough to allow for management practices like weed management, fertilization, and irrigation line maintenance. Nursery trees with greater than a 1/2 inch diameter may have already developed lateral branches. Using pruning shears, remove most of these branches, leaving three to five branches that are evenly spaced in a north, south, east, and west direction. Depending on the length and vigor of the remaining lateral branches, cut them back two to three inches or closer to the trunk to stimulate vigorous lateral growth. During the first spring and summer, trees should be managed to produce as much vegetative growth as possible, with major pruning left to the winter months when the trees are dormant. However, new plantings can be pruned lightly during the summer without reducing leaf surface area much. Some growers pinch off undesirable branches and remove vigorous branches that may divert growth away from the scaffold branches. During the second and third summers, undesirable branches can be pruned from peaches and nectarines, and excessive growth from the top of plum trees topped or cut.

The same basic pruning methods are used in the third and fourth dormant seasons as peaches and nectarines are pruned to an upright but lateral canopy with an open center having three to four primary scaffold limbs branching out to five or six secondary branches and smaller twigs four to five feet above ground (Figures 6). Maintaining an open center in this way will allow light penetration throughout the canopy to stimulate the production of new fruiting wood, improve fruit quality, and enable workers to pick fruit without ladders. Summer pruning mature trees can open the canopy to light and improve tree vigor and fruit quality. When summer pruning, leave some leafy twigs to prevent sunburn on the scaffold limbs. These twigs can be removed later to restrict their vertical growth (Figures 7 and 8). Cutting back the tree at manageable, the height of 6-8 feet, can be done either by had pruner or disc pruning or cutter bars machines (Figures 9).

When dormant pruning, open access to the interior canopy for fruit thinning later latter in the season need to be considered during the pruning cuts. Note that plums grown in Florida develop such densely branching canopies that the interior of the tree must also be dormant pruned to allow light penetration.

Tree condition, cultivar, geographic location, and history of past spring freezes should be considered when determining the best time for pruning. Stone fruit trees must drop their leaves before they enter dormancy. Given our variable weather during November and December, trees in some areas, mainly south-central Florida, will retain their leaves. Growers commonly spray zinc sulfate during this time to defoliate trees. Zinc sulfate is "hot" enough to cause leaf drop and can also add zinc to the soil. Defoliating trees in early November winter can ensure that dormant oil sprays for scale control can penetrate branch crotches and other protected areas where scales overwinter. It is also easier to see where trees should be pruned.

When training young trees, consider that pruning cuts will affect later canopy development, so do not make drastic cuts. Maintaining an open center for mature trees allows more leeway in making pruning decisions. When growing cultivars with a range of chilling hours, prune the lowest chilling cultivars first because they will break dormancy earlier than higher chill cultivars.

Although dormant pruning has advantages, growers in more northern areas without freeze protection sometimes wait until the middle of March to prune, even though trees may be in full bloom (Figure 11).

eaches and nectarines bear fruit in the spring on one-year-old wood (wood grown during the previous spring, summer, and fall). Japanese plums bear fruit primarily on lateral branches or spurs that are two years old or older and secondarily on one-year-old wood like peaches and nectarines. These differences in fruit bearing patterns affect pruning practices. For example, peaches and nectarines should be dormant pruned to position new fruiting wood within the canopy and around the outer perimeter of the tree.

Apple and pear trees are usually pruned to a central leader (main trunk) and scaffold (side) branches (Figure 1). Side branches need to have wide angles of attachment to the trunk to be strong. Each year, pruning and training is needed to produce high quality fruit and maintain tree health. The tree canopy requires training to allow leaves to be exposed to sunlight so they can make sugars for tree growth and fruit production. Fruit trees with many branches can bear more fruit than they can ripen. Controlling the number and position of scaffold branches, along with fruit thinning, will result in a healthier tree and higher quality fruit.

Pruning and thinning are not required to keep avocado trees productive or attractive. If you do prune to keep trees smaller or more confined, the ideal time is just before bloom or just after fruit set. That way the tree can naturally adjust its fruit load during the June drop. Minor pruning can be done at any time, but avoid late-season pruning, which can stimulate excessive tender growth that is likely to be injured by frost. Prune sparingly and remove as little green wood and as few green leaves as possible. Protect any exposed branches after pruning from sunburn by painting with a 50:50 white latex paint and water mixture.

All blackberries and raspberries must be pruned and trained. Floricane-fruiting caneberries need pruning several times a year. Primocane-fruiting raspberries need to be pruned (mowed) once a year during the winter.

After fruiting, remove dead floricanes and thin out weak primocanes as time permits. In late winter, prune the lateral branches to 12 to 18 in. as needed. Some cultivars can be quite vigorous and produce lateral branches that are several feet long. Plants that are allowed to produce fruit on excessively long laterals may be prone to overcropping, which will result in small fruit of poor quality. Pruning will also increase air, sunlight, and spray penetration within the row. This will make harvesting more convenient and result in larger berries. Where large-diameter pruning cuts are made, stem disease has been severe in some years. A fungicide application after pruning is recommended. At the same time, remove any remaining dead or weak wood. Leave only about six to eight healthy, vigorous, evenly spaced canes per linear yard (3 ft) of row. 041b061a72

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