Pre-harvest water-control citrus has stricter requirements on water during the mature period. Moderate water-control can increase the soluble solid content of citrus, thereby improving fruit quality. Clean the ditches in time, drain the accumulated water, and keep the soil properly dry; where conditions permit, the water can be controlled by methods such as mulching and cultivation in greenhouses to reduce the inhalation of soil moisture. Reflective film is often used for mulching, which not only reduces the intrusion of rainwater, but also improves the light inside the canopy, increases the coloration of the middle and lower fruits, and improves the quality.
When foliar fertilizer is turned to maturity, the leaves are sprayed with topdressing. You can choose to use 750 times of micro-reinforcing power and 500 times of micro-reinforcing power, or 0.3% urea plus 0.2% potassium dihydrogen phosphate, etc., spray every 10-15 days 1 to 2 times, it can improve the luster of the peel, improve the quality, reduce the floating skin, and extend the storage period.
Timely harvest Early-maturing varieties should be fully colored in the fruit, and the soluble solids and acid content of the fruit should be harvested when the varieties are up to the standard. The fully matured fruits can be picked at the market according to the needs of the market. The same tree can be picked in batches , Pick large or middle-upper fruits first, and it is strictly forbidden to pick green; mid-late-maturing varieties are harvested and sold or stored in time according to weather conditions to prevent the fruits from freezing. When harvesting, choose the right weather and pay attention to the harvesting method.
Choose the fertilization period, fertilization amount and fertilization method according to the variety, the amount of fruit hanging in the year and the tree vigor. Generally, early-maturing varieties can be applied one week after harvest, mid-maturing varieties can be applied while harvesting, and late-maturing varieties applied one week before harvest; fertilizer types are mainly organic fertilizers, with a small amount of ternary compound fertilizer, and the amount of fertilizer applied accounts for about 40% of the annual . Organic fertilizer can be decomposed barn fertilizer, barn fertilizer or commercial organic fertilizer. The fruit-picking fertilizer is generally applied deep on the ground. In drought, water or irrigate before applying fertilizer. For the trees with too many fruits and weaker vigor in the year, after harvesting the orchard for extra-root topdressing, 0.2-0.3% urea or rare earth fertilizers and other foliar fertilizers can be sprayed 1-2 times to promote tree vigor recovery and reduce Fallen leaves.
After harvesting, clear the orchard. After harvesting, cut off dead branches, diseased and pest branches, clumping branches, thinning out or shrinking cross branches, overlapping branches, and senescence branches. For trees with too many parent branches, you can appropriately delete the parent branches. Branches, clean up dead branches, fallen leaves, fallen fruits and weeds; plow the garden, turn overwintering insects or pupae in the soil to the surface of the soil, freeze or die in the sun, or be preyed. Whitening the trunk can not only kill insects, prevent diseases, but also prevent freezing. Use 99% SK mineral oil emulsifiable concentrate 180 to 240 times liquid, or 8 to 10 times pine alkali mixture, or Baume 3 to 4° lime sulfur mixture, etc. for spraying throughout the garden. Before harvesting, the canopy spraying should pay attention to the choice of agents and the safety interval. Generally, it is required to stop the canopy spraying one month before harvesting to ensure the safety of fruit quality.
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