First, nutrition control
1, nitrogen control. For plants with more vigorous tree vigor or younger fruit, do not apply nitrogen fertilizer to the early stage of Xiehua-Xiazuo sprout to control vegetative growth and reduce the emergence of summer shoots.
2, increase potassium. Before the spring shoots mature until the summer shoots germinate, potassium fertilizer may be reused, and pure potassium dihydrogen phosphate may be applied 100 times in the rhizosphere, and pure potassium dihydrogen phosphate may be sprayed on the leaves for 100-fold and 2-3 times. On rainy days, pure potassium dihydrogen phosphate 50-100 times plus 500 ppm-750 ppm paclobutrazol can be used, 1-2 times. The plants that have drawn summer shoots can be wiped off by the summer shoots and immediately sprayed with pure potassium dihydrogen phosphate 50-100 times with paclobutrazol at a concentration of 500ppm-750ppm, 1-2 times.
Second, drug control
1, paclobutrazol control tip: to suppress the summer shoots, it is recommended when the summer shoots in 2 cm below the withdrawal, the use of control tip drugs (for more than 2 cm tip can be manually stripped), such as: 500ppm-750ppm concentration of paclobutrazol (200 g - 300 g 15% paclobutrazol wettable powder 60 kg water) spray the crown, and spray the second time every 20 days, usually sprayed twice, can inhibit the growth of summer shoots, and is relatively safe for young fruit. The inhibitory effect of paclobutrazol on the summer shoots of Shatangjue is generally about 20 days. After the efficacy period expires, shoots can be grown from scratch.
Note: Paclobutrazol can be used only after 10-12 days of gibberellic acid for the second time. The specific time will be used after the size of the fruit and the young fruit are completely green, that is, after the nutrient is transferred to the young fruit, the conditions are normal. Paclobutrazol was sprayed to spray the water droplets close to the drip to preclude the extraction of summer shoots.
2,2,4-D control tip: Generally 2,4-D is used to preserve the fruit of sugar orange to prevent physiological fruit drop, and at the same time, it can inhibit the extraction of summer shoot. Suggestion: 1g2,4-D watered 100-150 pounds, spray wet on summer shoots. The technical requirements of using 2,4-D to preserve fruits and control summer shoots are relatively high, and are suitable for use by experienced fruit farmers. Novice needs a small area to try it out.
3, drug killing shoots: use more broadleaf herbicides, such as milk fluoride grass grass spirit, oxyfluorfen, Qingxin and herbicide glyphosate and other herbicides. The use of such pesticides must be strictly controlled citrus phenophase, environmental conditions, drug concentration, application of pesticides and other conditions to protect the fruit tree first, kill the second, pay attention to safety, try before use.
Third, ring cutting control
For circumcision, tree vigor is prosperous and there are few young fruit on the spring shoots. Plants with good early-stage fertilizer and water management, such as the cranberry oranges in the first two years, can be used before the second physiological fruit drop. At 20 days, the plants were circumcised after spraying the secondary preservatives. Generally 15-20 days after ring cutting wound healing, can be cut once again, to a certain extent, control the summer shoots.
Fourth, fruit control
The development of the fruit will inhibit the growth of sugar orange and summer shoots, especially the fruit at the top of the tree crown. The fruit shoot tip ratio will be more than 10, the summer shoot will be effectively suppressed. Therefore, by increasing nutrition, accelerating the aging of spring shoots, and increasing the fruit setting rate of leafy single top fruit, it can inhibit the extraction of summer shoots to some extent.
Fifth, to shoot the tip
1, artificial wipe tip. Not only does it put a lot of manpower time but it is inefficient, it is not recommended for large-scale planting, and the elimination of summer shoots from the base will trigger a lot of germination of new summer shoots, consume more tree nutrients, and exacerbate the second physiology. Falling fruit. For small-scale orchards, try artificial tipping. The tip of the shoot is the most commonly used method of artificial wiping. When used properly, it can achieve a multiplier effect. Keep the top of the summer tip. At the top of the tree, a certain amount (about 5%) of summer shoots is reserved. The apical dominance retains the regulation of tree nutrients, consumes some auxins, and controls the growth potential of the new summer shoots. Short cut summer shoots. The short shoots of summer shoots were used to utilize buds with weaker growth potential in the lower part to reduce the growth potential of newly emerged summer shoots, thereby reducing the number.
2, to shoot control tip. It can also promote the rapid and mature method of summer shoots by supplementing nutrition, which not only can supply young fruit development nutrition, but also can control the germination of new summer shoots and reduce the fruit drop caused by the top fruit competition.
To sum up: the fruit is the purpose, the control of the tip is the way, whether the control tip or kill tip, are to reduce the growth potential of the summer shoots, so as to achieve the purpose of fruit preservation and stability. It is suggested that from the aspect of controlling the vegetative growth of the tree, it is more important than Mongol to weigh less potassium and potassium. Generally, the balanced fertilization of the tree and the rainy weather can be used to control the tip of the drug.
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