In summer, it is the key season for ensuring lemon production and improving the quality of lemon. Lemon summer management techniques mainly include the following aspects:
I. Soil, fertilizer and water management
1, water management. Due to more rain in summer and sustained high temperature, the humidity in the orchard is too high. The orchard should be drained in time to properly drain the ditch and back ditch. The depth of the drainage ditch may vary depending on the stage of the soil. The dry field ditch is 70-80cm deep and 60cm wide. One soil and two sets of soil have a depth of about 40cm and a width of about 30cm. In case of drought, when the soil moisture content is less than 60%, water should be immediately poured to ensure sufficient water supply during the young fruit period. Water-saving hole irrigation, and use straw, straw to cover the tree plate, to humidification and cooling.
2, Shi strong fruit fertilizer. According to the weather conditions, determine the fertilization time, determine the increase and decrease of the amount of fertilizer according to the soil mass and the tree vigor.
In the period from late June to July 20, 2 kg of special fertilizer for lemon and 80 to 100 kg of livestock and manure water will be produced within 25 kg of the current year's strain. If the yield is increased by 10 kg, 0.5 kg of special fertilizer will be added.
Second, summer trim
For the adult result tree: First, remove the summer shoots in time to avoid shoots and fruits competing for nutrients and reduce secondary physiological fruit drop; second, cut weak branches, diseased and diseased branches, dense branches, and legged branches to ensure the internal ventilation of the tree; Some old and weak trees with few fruit-bearing trees are moderately sheared and enhanced with fertilizer and water management before the summer solstice; the saplings are plucked to promote the expansion of the canopy and the dry shaping.
Third, pest control
In the summer, the main pests of lemons are red and yellow spiders, arrowheads, rust ticks, anthrax, and scab.
1, red and yellow spiders
Red-yellow spiders mainly damage the leaves, red spiders cause gray and white spots on the victim leaves, and the whole piece is grey and white when they are severe, and cause defoliation; the yellow spider causes the leaves of the victim to appear on both sides of the main vein and between the main vein and the branch veins. Large macules can cause deformity or loss of leaves. The damage is heavier and prevention and control should be done.
Control agents: 124% of the endangered EC 4000-6000 times solution (only once a year); 220% broom net EC 2000-3000 times; 35% NiSOULO EC 1000-1500 times; 420% IVèž“ EC 2000 times; 50.3% Azadirachtin EC 1000-1500 times; 645% crystal lime sulfur 250-400 times.
The above agent can be evenly sprayed with water.
2, lemon arrow tip
The lemon spine damages lemon leaves and branch shoots, leading to yellowing and shedding of the leaves. When the leaves are severe, the branches are dead; damage to the fruit causes yellow spots and affects the appearance quality of the fruit. When there are dead branches that are damaged, they should be cut off and burned in a concentrated manner. For the light orchard picking governance, for the prevention of orchard garden harm. Especially heavy can be continuously controlled 2-3 times. The first control period is May 17-20; the second period is May 29th-June 1st; the third time is June 13-18.
Control agent: 13% annual Feng EC 1500-2000 times; 20.5% fruit EC 800-1000 times; 348% 1500 times; 440% giant 1000-1500 times liquid; 50.5 Bomerite lime sulfur spray (used in June); 625% buprenorphine wettable powder 1500-2000 times liquid.
The above agent may optionally be added with a new high-fat lipid membrane evenly sprayed with water.
3, lemon rust niches: mainly damage the lemon leaves and fruit, resulting in gray or black fruit, prevention and control of appropriate period, from June to August, to strengthen the inspection of the lemon garden, when the whole park found a gray fruit (black fruit or rust When the niche is newly damaged leaves), the pesticide is immediately applied to control.
Control agent: 110% benzoate suspension agent 1500-2000 times; 220% broom nectar 2000-3000 times solution; 320% tetrahodium 2000 times solution; 40.5 Bomi degree lime sulfur agent.
The above medicament may optionally be added with a new high-fat film to control the water.
4, lemon anthrax, scab
In the case of more rain, anthrax and scab can easily cause fruit drop. In the summer, drainage should be paid attention to reduce the humidity in the field, picking up the fruit in the garden and burning it in order to reduce the number of pathogenic bacteria; doing well in the prevention and control of anthrax and scab, and combining the use of pesticides for disease prevention , Application interval 10-15 days, continuous application 3-4 times, and do alternating use of pesticides.
Control agent: 110% Shigao water dispersible granules 3000 times solution (therapeutic agent); 218% Bao Zhida Emulsion 800-1000 times solution (therapeutic agent); 3 Hushu General; 4 25% Shi Bao Ke Emulsion 1000 times solution ( Therapeutic agent); 512% myclobutanil 2000 times solution (therapeutic agent); 670% thiophanate-methyl wettable powder 600-800 times solution (therapeutic agent); 780% Dasheng M-45 WP 600-800 times solution (Protection agent); 880% mancozeb WP wettable powder 600 times (protective agent); 90.5 Bomidol lime sulfur (used after mid-June).
The above medicament is optionally controlled by water.
Fourth, lemon bagging technology
1, bagging time: lemon spring fruit should be the end of June to mid-July bagging; summer flowers and fruit should be bagged in August-September, lemon fruit bagging after the growth time to ensure 70-90 days.
2. The choice of bagging fruit: choose fruit bagging with early-stage pest control, smooth fruit surface, good fruit shape, no pests, and fruit diameter of about 35mm.
3, the choice of paper sets: choose 50 grams of paper, paper 40 grams of opaque wood pulp paper bags, requires good moisture resistance, tensile strength, permeability, with alcohol in the surface does not soak, In the water is not bad, dripping does not spread on the surface layer, there is a buried wire, with a fist into the bag after the light with the naked eye from the inside to see no trachoma.
4, bagging method: "support two sets of three to close four twisted": first with a fist to open the paper bag, and then a fruit set of a paper bag, and the fruit set with the bag in the middle part, bag mouth flat * handle Close the bag mouth and wrap it with a stalk wrapped in the edge of the fruit bag.
5, bagging precautions: fruit 1-2 days before the bagging of the tree, fruit surface evenly and thoroughly spray insecticide, fungicide, to be fruit after the drug can be bagged; if Shishi sulfur mixture, Should be bagged after spraying 5-7 days to avoid fruit burns; can not apply the drug can not be set, poor control of the previous disease can not be set, the drug is not dry can not be set, dew can not be dry sets, can not be set on rainy days, noon high temperature Can not be bagging, paper bag sealing should be down, after bagging in case of drought should be timely irrigation and straw cover. (China Plant Protection Network: Li Ruifeng)
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