(I) Fertilizer and water management The mandarin orange needs more fertilizer, and the big fruit trees should be fertilized 3 to 4 times a year. One time is post-harvest fertilizer, and it is applied as a base fertilizer from October to November. Pit-applied organic fertilizer 50 kg plus 1 kg alfalfa bio-fertilizer to harvest later mid-maturing varieties can be applied one week before fruit picking. Fertilizer accounts for 40% to 50% of all-year fertilizers. Once it is precipitating fertilizer, it is warmed up in the spring and is applied 1 to 2 weeks before the sprouting of the citrus fruit. This causes the spring shoots to grow neatly, grows robustly, and delays old leaf shedding. , improve the fruit rate. Each plant applied 1 kg of nitrogen fertilizer plus 1 kg of alizarin biological compound fertilizer. Once again, a strong fruit fertilizer was applied in July after the physiological fruit drop was stopped. Each plant applies 0.5 kilograms of potash plus 1 kilogram of alizarin biological compound fertilizer, and the young tree can be used together with releasing fertilizer and irrigation.
(2) The phenomenon of flowering and fruit falling of citrus fruit is relatively serious, and different measures should be taken to distinguish the reasons. For poorly-growing weak trees, fertilizer and water management should be strengthened, thinning and fruit thinning should be carried out to maintain a certain leaf-fruit ratio, and the leaf-preserving work in winter and spring should be done. For the prosperous shoots, especially the summer shoots caused by too many flowers falling, should be appropriate control fertilizer control tip, and spray sneeze g 1000 times liquid. For saplings that grow more and more, 2 to 3 laps can be cut with a sharp knife from the flower bud stage to post-flower stage to temporarily suppress growth.
Pest Control
Citrus huanglongbing: The initial symptoms are the appearance of 1 to 2 or more yellow shoots in the thick green canopy. The leaf is hardened and dull, but the old leaves in the lower part of the yellow shoot are still normal green. Control methods: 1. Implementation of quarantine; 2. Extirpation of diseased plants; 3. Control of citrus rafts, through water and fertilizer management control tip to reduce raft propagation and spread. New shoots are sprayed with 1 or 2 pesticides. Planting shelterbelts around the orchard will also hinder the flight of the raft.
Citrus split skin disease: The root of the diseased tree's rootstock bursts longitudinally, the bark curls up, and scale flakes off afterwards. Control methods: Coated with the bacteria line Wei 1000 times or 3500 times with the bacteria Wei Wei Irrigation roots, each strain 1000 ml perfusion.
Citrus canker disease: The victim's leaf begins to appear as yellow or green needle-sized oily spots on the back of the leaf, which expands to form a nearly circular, beige-colored lesion. Soon the epidermis of the disease ruptured and the surface roughened. Spraying during the shoot growth period is 15 to 20 days after germination, and the spraying of fruits during the fruit growth period starts 15 days after the flowering. Available bacteria or Guoyou 101 fungicide 1000 times liquid spray gram 1000 times liquid spray.
Citrus anthracnose: often from the tip of the leaf, the beginning is dark green, like the hot water burned like, sick, Jian Department of the junction is not obvious, after becoming yellowish or brown, leaf curl, fall off. Pharmacy control sprayed once every spring shoot in spring, summer and autumn shoots. Protection of young fruit should be carried out within one month after flowering, spraying once every 10 days or so, spraying 2 or 3 times continuously. Available bacteria or Guoyou 101 fungicide 1000 times liquid spray gram 1000 times liquid spray.
Citrus scab disease: mainly damage new shoots, leaves, young fruit, but also damage flower buds and petals. Control methods: The first time the buds germinate, the second time is 2/3 o'clock. Available bacteria or Guoyou 101 fungicide 1000 times liquid + spray 100 grams of liquid spray.
Citrus foot rot: Mainly affecting citrus roots and necks about 10 cm above and below the soil. When a diseased tree is found, the decayed part and some healthy tissues around the diseased part are promptly scraped off, and then they are coated with 1000 times liquid of mycelia or 3500 times liquid with mycelia, and 1000 ml of each liquid is applied.
Citrus black spot disease: Occurs on nearly mature fruits, but rarely occurs on green fruits. Within one and a half months after flowering, young fruit should be sprayed and sprayed every 10 to 15 days for a total of 2 to 3 sprays. Available bacteria or Guoyou 101 fungicide 1000 times liquid spray gram 1000 times liquid spray.
Penicillium citrinum, green mold: The symptoms of citrus green and green mildew are basically the same, all of which can only harm the fruit and cause fruit rot. The use of squeaking grams 1000 times liquid dipping fruit, have a good control effect on green and green mildew. The earlier the postharvest treatment, the better. Disinfection of the storage warehouse, before the fruit is put into the warehouse, the warehouse is sprayed with 5000 times liquid of mycelia, sealed and fumigated for 3 to 4 days, and then open the doors and windows for 2 to 3 days until the medicine gas can be stored.
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