Citrus planting field management technology How to fertilize and water the citrus in June, entering June, the phenological period of citrus in South China is in the summer germination period and the second physiological fruiting period. The main management purpose of citrus is to control summer shoots and preserve fruit. In the Guangdong and Guangxi regions, sugar orange, tribute orange, Shatian pomelo, honey pomelo, horse water orange, spring sweet orange, navel orange and early mature Wenzhou mandarin orange are all in the young fruit period, and attention should be paid to controlling the fruit and keeping the cultivation measures to promote the expansion of young fruit. . Management should pay attention to the following six tasks.

Fertilization

1. Apply heavy fertilizer. Prepare to attack the autumn shoots and strong fruit, heavy fertilizer requirements to complete 15-20 days before the shoot. Fertilization can be started after the second physiological drop (below June), and pits are drilled near the canopy drip line. Each hole is 20-750px deep and about 1 meter long. Each plant is applied with 1-2kg + calcium magnesium phosphate fertilizer 0.5-1kg + Runtian organic fertilizer 10-20kg. For the weak trees with many results, the Runtian Bio-organic Fertilizer will be added once in the second half of June, and the fruit will be appropriately thinned.

2, the top of the top dressing. For fruit trees with poor tree and very light leaf color, it is necessary to carry out root dressing in time to supplement the lack of nutrients. Functional foliar fertilizer + high potassium foliar fertilizer or high calcium foliar fertilizer, 7-10 days apart, 2-3 consecutive times, stable tree potential can promote young fruit expansion. The functional foliar fertilizer can be selected to contain organic foliar fertilizer.

3. Potassium fertilizer can be added in May-July. In mid-June, 1-2 potassium per plant can be used to promote the expansion of young fruit and prevent cracking in the later stage.

Water management

Irrigation and drought resistance are important field operations in June. It is necessary to prevent drought and drought, but also pay attention to heavy rain. After heavy rain, it should be drained in time; when the soil is close to drought, it should be timely flooded, and the tree plate should cover the weeds to prevent weeds from growing. If the leaves of the plant leaves are not restored before 10 o'clock in the morning, it is necessary to drench water and drought as soon as possible to ensure 40-60 kg of water per plant.

Cultivating weeding

In the hot and rainy season, weeds are easy to breed, and the weeds under the canopy should be removed in time and cultivated to keep the soil loose. Weeds that do not affect field work between plant rows can be properly retained to avoid high temperature affecting the growth of fruit trees.

Summer pruning

1. For the old and weak trees, properly update and rejuvenate the pruning. After the summer shoots are taken, it is necessary to timely bud and set the branches and rejuvenate the branches.

2. For the young and middle-aged tree, continue to erase the summer shoots. A small amount of summer shoots can be left, which can both pull nutrients and inhibit the germination of other lateral buds.

3. For the densely planted orchard, short-cut the flowering and falling branches and the decaying branches in the middle and upper parts of the plant, so as to promote new shoots, eliminate the dense branches and cross branches without fruit, and improve the ventilation and light transmission of the orchard.

Prevention of pests and diseases

Continue to grasp the prevention and control of spider mites, rust spiders, citrus psyllids, black mites, anthracnose, resin disease and ulcer disease, in addition to continue to capture adult larvae and larvae, choose good pharmacy to prevent.

1. Red spider control. You can choose 240g/L snail ester suspension (endangered) 3000-4000 times liquid or 110g/L oxazole suspension (Lefu) 6000 times liquid + 1.8% avermectin emulsifiable concentrate 3000 times liquid, or orange Miao (profenofos + ethiazole) 1200 kg water / set, or Jinming 螨 (tetrazine • biphenyl phthalate) 2000-2500 times solution, or 0.3% azadirachtin 1500 times solution.

2, rust spider control. When the average number of insects per leaf reaches 2, when there is copper rust on the back of spring leaves or 5 heads per fruit worm, and dark gray on individual fruits, 0.3-0.5 Baumeite sulphur mixture can be used, or 45%. 350-400 times solution of stone sulphur mixture, or 800 times solution of 80% sulphur WP, or 600 times of 65% sensitized zinc, or 1.8% avermectin 2000 times, or 5% 虱螨 虱螨 2000 2000 Double liquid for prevention and treatment.

3, black cockroach prevention. Lift the torch at night and shake the branches to trap black worms or wrap a 8 cm wide plastic film strip at the base of the trunk to prevent the old nymphs from peeling off the trees, cut off the damaged branches, and burn them intensively.

4, citrus hibiscus, fruit and fruit pests and other prevention and treatment. Use avermectin or pyrethroid + chlorpyrifos, or a vitamin salt + chlorpyrifos or phoxim.

5, anthrax and resin disease prevention and treatment. After the rain, spray 80% mancozeb 600-800 times solution, or 10% difenoconazole 1500-2000 times solution, or 70% methyl thiophanate 1500 times solution, or 40% gram of bacteria. Dan suspending agent 600-800 times liquid, or Baitai 2000 times liquid to protect young fruit and young shoots in time.

6, ulcer disease prevention. Spray 7-10 days in the summer to spray in time, once every 15 days, for 3 times. It is necessary to take time to spray protection after the rain. You can choose Zhixin (77% copper hydroxide wettable powder) 900 times liquid, or 53.8% copper hydroxide water dispersion granule 900-1000 times liquid, or 30% copper thidium suspension 800 times liquid, or 27.12% Basic copper sulphate suspension (copper noble) 600 times liquid, or 72% agricultural streptomycin WP 2000 times liquid, or 3% gold ribomycin water 300 times liquid, or 4% spring seromycin water 800 Double solution, or 3% thiazolone suspension 500 times solution.

Anti-burning sunburn

Early-maturing Wenzhou mandarin orange or navel orange in the summer when the temperature is high and dry, the fruit is easily burnt by the strong direct light. The prevention of sunburn can be done in four steps: 1. Timely drought resistance, maintaining normal water supply, and preventing fruit burns; Add a little salt to the lime fruit of the sun fruit; 3, or paste it with the old newspaper to the Yangchao fruit; 4, spray the surface of the astaxanthin, or the alginic acid foliar fertilizer, or the humic acid foliar fertilizer to improve the plant resistance. It can effectively prevent sunburn and fruit damage.

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