First, Apple's expansion of the coloring period management is not careful
From August to October, apple trees are in the period of fruit harvesting and coloring, which is an important period to improve fruit quality and enhance tree potential. The following management work should be done.
Tree management
In late August, pull the branches to the 80-degree angle and the auxiliary branches to the 90-degree angle to ease the growth potential and increase the light area of ​​the tree.
Pruning the results of the bar, the erect branches, the inner squeezing branches or the branches by twisting and twisting; retracting or wearing a cap to trim the perennial slender auxiliary branches; ~ 12 leaves topping. The leaves within 5 cm were removed before fruit coloring, and the leaves within 15 cm were removed after 10 days. At the same time, the fruit was turned to the shaded surface to promote uniform coloration of the fruit.
In addition to the bag for the fruit that has been placed on the double-layer bag, 40 days before the fruit is cooked, the outer layer bag is first removed, and the inner bag is removed after 5-7 days, and the word or pattern is attached to increase the commercial value of the fruit. .
Pest control in early August and mid-September, killing the young urea 3, 2000 times or 10% killing 3000 times to control the leaf miner and other pests. 20 days before the harvest, 80% of the "1605" was applied to some of the early-maturing rotten fruit to trap the chafer. Spray the fungicide every 10 to 15 days, focusing on spraying after the rain. The selected agent has 70% methyl thiophanate 1000-1500 times solution and 50% carbendazim 80 times solution. 0.3% to 0.5% potassium dihydrogen phosphate solution was added during spraying, and 0.5% urea was added after fruit harvesting.
Spraying hormones For the varieties with heavy fruit before harvest, 40 ppm of naphthaleneacetic acid was sprayed 50 days before harvesting, once every 15 days for 2 to 3 times. After harvesting the fruit, in order to prevent the tree from growing and increasing the storage nutrition, 15% paclobutrazol 150 times solution can be sprayed.
Tree management
Fertilizer management in autumn controls nitrogen fertilizer and phosphorus and potassium fertilizer. Before the ripening of the fruit (early mid-August), according to the yield, the plant applied 0.25-0.5 kg of diammonium phosphate and 0.5-0.75 kg of potassium sulfate, and watered it in an appropriate amount. One month before mining, if the rainfall is too large, pay attention to drainage. In the middle and late October, the organic fertilizer was added. According to the planting amount of 0.5 kg to 0.75 kg of organic fertilizer and 1 to 2 kg of phosphate fertilizer, the fertilizer was applied in a radial or annular ditch and watered.
After harvesting, the fruit is colored for the fruit with poor coloring. In order to promote the color of the postharvest fruit, you can choose spacious, airy and flat place, spread 3 cm thick sand or grass, put the fruit vertically into 3 to 4 layers, morning and evening. Spray the water once, cover it at 8:00 am every day, and unveil it at 5 pm, so that the fruit coloration is obviously improved after 5-7 days.
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