Main points of citrus cultivation in November

Autumn drought persists during fruit ripening and flower bud differentiation. This year's citrus production is affected by autumn drought after summer drought. Fruit development is significantly affected. The ratio of small fruits is greatly increased, and the acid content is high, which has a great impact on citrus quality. . Entering November is the most important harvesting period of citrus in our province. The early harvested ripe oranges in the ripening season were basically harvested, and the cold air activity increased, and the temperature continued to drop. According to the forecast of the provincial meteorological observatory, the precipitation in November is close to normal or slightly more, and the number of monthly precipitation days is normally slightly higher, and the average monthly temperature is normal or slightly higher. During this period, citrus cultivation should do the following work: (1) timely harvest due to the small amount of rainfall this year, the low soil moisture content, reduced the degree of skin pumice production of citrus fruit harvested, high soluble solids content At the same time, the acid content also increased. The freshly-stemmed citrus should be mastered when the fruit is fully matured to achieve the inherent color of the variety. When the juice reaches a certain ratio of sugar to acid, the ratio of sugar to acid of the wide-skinned citrus is 11 to 16:1, and the pomelo and sweet orange are 10 to At 12:1, the best quality is achieved. Miyagawa, Xingjin Precocious Satsuma Mandarins, Local Early Sweet Oranges, Navel Oranges, etc. can be harvested thoroughly, finished in batches, harvested in batches, and sold in time. For storage species, such as 崭獭 崭獭 撮伲 诎 诎 诎 诎 墒焓 2 墒 墒 诩洌 鏊 鏊 鏊 鏊 鏊 鏊 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 Mining. (2) Keep fresh and keep fresh. At present, the commonly used preservatives and dosages of citrus are: imazalil (Diamondium) 400-500 mg/kg, flucladac 250-500 mg/kg, 100-500 mg/kg, or 250 500 mg/kg and so on. 3 to 5 days before harvesting, the canopy was sprayed with an anticorrosive preservative and was not treated after harvesting; or the fruit was soaked in the preservative liquid within 1 day after picking and taken out to dry. 2 storage. Citrus fruits used for storage must be strictly excluded from wounds, diseases, pests, fruits and fruits. Before entering the storage, pre-storage in a well-ventilated place for 3 to 5 days, polyethylene bags or bags may be used. Polyethylene fresh-keeping bag single fruit packaging, re-storage storage. The optimum storage temperature for wide-leaf citrus was 5°C～8°C, 3°C～5°C for pomelo and sweet oranges, and the relative humidity was 85%～90%. At the early stage of storage, high temperature and high humidity are likely to occur in the warehouse. When the ambient temperature is lower than the temperature in the warehouse, ventilation is enhanced to reduce the temperature and humidity in the warehouse. When the relative humidity in the warehouse drops below 80%, it can be covered with a plastic film to moisturize, and water can be sprinkled on the floor or in the basin to increase the air humidity. Regular inspection of fruit rot, rotten fruit to pick out processing, if rot is not much, try not to turn the fruit, according to market changes in batches of appropriate delivery. (3) Soil management This year, the weather is dry, and the growth and absorption of roots are the most affected. After harvesting, irrigation and fertilization should be performed immediately to supplement the fertilizer. The fertilization of citrus should be sooner rather than later, and it should be applied before the low temperature comes. It will promptly supplement the nutrition, restore the tree vigor, promote flower bud differentiation, and improve the cold resistance of the orange tree. If the fertilization is too late, the nutrients will not be easily absorbed if the ground temperature decreases, and the tree vigor will not recover easily. For ripe-cultivated varieties and when the weather is warm and rainy, taking into account the possibility of delaying the coloration and occurrence of peltation, it is possible to delay the fertilization slightly. Ordinary Wenzhou oranges should be fertilized before mid-late November. Fertilizer accounts for 40-50% of the annual application amount, with fertilizers mainly composed of organic fertilizers and appropriate chemical fertilizers such as phosphate fertilizer, urea or compound fertilizer. Plants with more mature cultivation and more fruit can be topdressed with fertilizer at the same time as fertilization. Several types of compound fertilizer can be sprayed continuously every 7 to 10 days. 0.4% urea or 2% superphosphate infusion can be used, or With 0.5% potassium sulfate, 0.5% magnesium sulfate, 0.1% boric acid, or soluble compound fertilizers and other solutions to promote the early restoration of tree vigor. This month is the last time in the year of fertilization for young trees. Don't miss it. (4) Pest control After harvesting fruit, the tree vigor is basically recovered. It is necessary to spray pesticides to prevent and treat winter diseases and pests, and to control the adults, larvae, and eggs of wintering habitats such as cockroaches and cockroaches in order to be even, comprehensive, and thorough. Drugs can choose 0.8 ~ 1 Baume degrees of lime sulfur, 10 ~ 15 times the pineine mixture and 99% of the enemy oil emulsion 150 times, 40% speed culling EC 800 ~ 1000 times. Anthraquinones can be sprayed with 50% Torque WP 1500~2500 times or 73% chlordecone 2000~3000 times or 5% nisoli EC 1000~2000 times. The fruit-feeding moth can be trapped by light, the fruit can be bagged, or the fruits and melons immersed in about 3 minutes 30 times liquid 40% protochlor EC or 50% ethyl phoxim EC can be hung in the orange grove and placed in an acre. 4 to 5 earthworms, height similar to the top of the canopy. Each morning, the dead moths are removed and the dressing is changed every 4 to 5 days. The chemical control can use 5.7% cyfluthrin (Hundred Tree) Emulsion 1000 to 3000 times or 2.5 times. Permethrin pesticides, such as 1000- to 2500-fold of emulsifiable concentrates, are banned every 15 to 25 days and are banned 25 days before harvest.

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