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Scientific cultivation and management techniques of citrus in summer
In the summer, citrus growth is in the first and second stage of physiological fruit drop. The contradiction between the summer shoots and the fruit preservation and fruit stability is particularly prominent. At the same time, various overwintering insects are hatched one after the other. This is the period when the first generation of larvae is most concentrated. The main measures taken by oranges in the summer are as follows: rowing and fruit protection, chase and applying strong fruit fertilizer, and pest control. First, the row of preserved fruits in summer with high temperatures and heavy rain, citrus easily draw a large number of summer shoots, consume large amounts of nutrients, aggravate the second physiological fruit drop, let it grow in summer shoots, it may result in reduced yield or even no harvest, so row Tip is the most effective measure to preserve fruit. In general, the young and middle-aged trees that enter the result period have less hair loss, stronger tree vigor, and more shoots from summer shoots. They must pay more attention to timely shoot tipping when the summer shoot length is 7 to 10 centimeters. Wipe away from the base, wipe it again every 5 to 7 days, then wipe it again thoroughly in early August, and then put on the autumn shoot. Into the fruit period of the tree, or more fruit trees, summer shoots a small number of students, but also promptly wipe buds, to late July, and then put autumn shoots, lay the foundation for stable production next year. Second, chase strong fruit fertilizer in late June, the second fruit citrus fruit basically ended, the number of fruiting plants is basically determined, the fruit into the growing season, requires a lot of water and nutrients, must be timely application of strong fruit fertilizer, It is best to use compound fertilizers containing potassium sulfate. For trees over ten years old or the result is more than 400, 2 pounds per plant is applied. Young trees or trees with less results will be reduced by the age of the trees and the amount of the results will be reduced. 50 kg, urea half a catty, superphosphate half a catty. Early maturing varieties are available from late June to early July, mid-late maturing varieties are carried out in mid-July and are made on the side of the crown. The digging depth is 30 cm, width is 20 cm, and length is 100-120 cm. Fertilizer mix. Weeds are buried in the bottom of the tree tray, and then the heart and soil are backfilled. Do not use it. 3. Prevention and control of pests and diseases In May, the first generation of larvae of citrus beetles, whiteflies, and spider mites came into being. It is necessary to pay close attention to patting both sides of the leaves. If there are more than 2 red dots on the hands, it must be timely. For drug use, spider mites use 73% of Ketek 2500x or 5% of Nissorene 2000x for insects, scale insects, and black locust powder use 40% thiazole for 1500 times or 25% for bupropion wettability. Powder 2000 times liquid. The period from May to July is the spawning period of Tianniu. One is to kill adult insects in time; the other is to use lime to brush the trunk and refuse to resist spawning; the third is to inspect the trunk area in time and once wet or sawdust is found, use iron wire first. Kill the larvae and fill the hole with poison cotton. From June to July, it is also a critical time for preventing and controlling rust infestation. In particular, orange groves that have this worm infestation in the first year must use 15% broom nectar 2000 times liquid or 73% chlorella 2500 times.
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