Management of oranges in Chongqing in early November

(a) Fertilization of citrus

Saplings: Intensive rearing of late autumn fertilizers, the plan is to put the tree into production the next year, and apply 15 kg of decomposed human or animal manure or 0.5 kg of compound fertilizer to each plant to prevent late autumn shoots and late autumn shoot removal. Result tree: fertilize before half a month before harvest, each plant applies urea, superphosphate, potassium chloride 0.2 kg, vegetable cake 1.0 kilograms, human and animal manure 20 kilograms.

(b) Storage of citrus tree: The color of orange fruit changes from dark green to light green (from late October to early November). To the tree body 2,4-D20 mg/L + "Nineteen" 10 mg / Liter (melting with a small amount of white wine) + urea 0.3% + potassium dihydrogen phosphate 0.2%. In early January and early February, sprayed with each of the above liquids, and in early December, 40 kg of human feces was applied per plant. In December, January, and early February, each irrigated water. The fruit of the leave tree was harvested in late February.

(3) To prevent late fruit ripening in winter: Use 2,4-D and other fruits for 4 times. In the week before the onset of the cold wave, be sure to hit 2,4-D fruit, or a large number of fruit drop. The first time the fruit is preserved in the middle or late October: use 10% water + 2,4 - D0.2g + "90%" 0.2g + urea 30g + potassium dihydrogen phosphate 20g; the second time to protect the fruit from late November to early December The third time the fruit was in late 12th to early January, and the fourth time the fruit was in late 1st to early February. For the second to fourth fruits, there is no need for "9:20" and fertilizer, and 10% water plus 2, 4 - D are 0.4g, 0.5g and 0.4g, respectively. Each spraying must be sprayed to the fruit pedestal to achieve the purpose of preventing fruit drop in winter.

From mid-November to early-December each year, deep-rotate the outside of the canopy, and each plant presses crop straw, weeds and non-polluting organic fertilizer 30 to 50?, or applies emulsified oil cake 5?; the tree plate is ploughed shallowly, and a good tree plate; dig 30-2 holes on each side of the canopy; each sapling is irrigated with 30 ,; adult trees are irrigated with 80 ,; covered with plastic film or crop stalks to increase the soil temperature by 1-3 °C. . According to observations made by the Chongqing Meteorological Station from 1965 to 1983, the average temperature in January was 7.2°C, while the ground temperatures at 5°, 10°, 15°, 20°, 40°, and 80°F were 8.4°C, 8.7°C, 9.1°C, and 9.4, respectively. °C, 10.4 °C, 12.7 °C. The soil temperature began to grow at about 12°C and the root system could still absorb nitrogen and moisture at 9°C to 10°C. In other words, as long as the management keeps up, it is in the coldest January that the root system in different soil layers can also normally absorb nutrients for the tree, thus minimizing the winter fruit drop.

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