One year's experience in cultivation and management of growing grapefruit

From February to March, ① topdressing application of budding fertilizer, plant application of human and animal manure 50kg 100kg, urea 0.15kg 0.25kg, or biological organic fertilizer 1kg, urea 0.15kg. ② sprays nisolang 1500002000 times liquid plus 0.3% 0.5% urea to control red and yellow spiders and increase foliar nutrition.

April: ① manages drainage and irrigation canals, Weirs and ditches. ② sows legume green manure. For trees with a particularly large number of flowers, ③ removes part of the fruiting mother branches and regulates the balance between vegetative growth and reproductive growth; trees with small flowers are sprayed with 0.2% boron fertilizer, 0.3% urea and 0.1% potassium dihydrogen phosphate to protect fruit. After shallow scraping and deep scraping of gum diseased trees by ④, topiramate or carbendazim was applied to control the diseased trees. ⑤ artificially catches and kills butterfly larvae, or sprays 25% Suijiaoding 1500 times solution to control.

May: after flowering in ①, 0.5% urea, 0.2% boron fertilizer and 0.1% potassium dihydrogen phosphate solution were sprayed to protect fruit. ② spray and wash firewood mixture (150g washing powder, 150g soda ash, 100g 200g diesel oil, 50kg water) or pine alkali mixture (1kg rosin, 0.75kg soda ash, 7.5kg water) 1520 times liquid to control scale, mites and whitefly pests.

June: ① summer pruning and aging tree renewal pruning (truncation, retraction). ② artificially hunts and kills adult longicorn beetles. ③ sprays 48% chlorpyrifos 1000-2000 times to control shell insects, whitefly, red and yellow spiders, rust wall lice and other pests. ④ sprays 25% Shachongshuang 500x solution or 1% imidacloprid 1000x 1500x solution to control leaf miner moth.

From July to August: ① was re-applied to promote shoot and strong fruit fertilizer in late July, and the plants were treated with 50kg of rotten human and animal manure, 1.5kg of calcium superphosphate, 0.1kg of potassium sulfate and 0.15kg of urea. ② was covered with grass, branches and leaves, rice straw and wheat straw to keep the soil loose, cool down and conserve water, and prevent Rain Water from scouring. ③ dredged the wormhole with filaments, stuffed the waste paper or cotton stained with dichlorvos or dimethoate into the wormhole, and sealed the wormhole with clumps of soil by hand to kill longicorn beetle larvae. ④ continued to control whitefly, red and yellow spider and rust wall lice.

September: when ① regenerates the roots of the old orchard, the large roots with a diameter of more than 1 cm should be less damaged, and the mature organic fertilizer or residue fertilizer should be applied. Water should be irrigated at the right time in case of drought to prevent dead trees. ② sprayed 0.5-0.8 Baomedo stone sulfur mixture to control red and yellow spiders and rust wall lice, and the concentration of the solution was adjusted according to air temperature.

October to November: if the autumn drought is serious in ①, it is necessary to irrigate and prevent drought to ensure the normal growth of trees and the development and maturity of fruits. ② control fruit damage caused by Spodoptera litura, red yellow spider and rust wall louse. 7-10 days before or after fruit harvest in ③, Fuzhuang fertilizer should be applied in time, 50 kg of human and animal manure water and 0.15 kg of urea.

From December to January of the following year: ① winter pruning, pay attention to retain leafless fruit branches and drooping branches to facilitate fruit, dense branches to take "three to one, five to two" principle of thinning. If the canopy is closed, the skylight should be opened to increase the ventilation and transparency in the canopy. The ② soil is 50 cm deep and 60 cm deep. ③ should concentrate on burning the cut branches and diseased branches so as to reduce the source of overwintering insects. ④ spray 1: 1.5 Baomedo stone sulfur mixture or 8: 10 times liquid turpentine mixture to clear the garden.