(1) Fruit protection
In early May, red pomelo pomelo enters the late flowering stage, and the young fruit grows in the middle and late, and enters the first physiological fruiting period and the second physiological fruiting falling period. Red pomelo grapefruit first physiological fruit drop period, when the shedding of mostly small flowers, flowers, after the Xiehua together with fruit stems fall off together. For this year's red meat honey grapefruit with low consumption, the top dressing fertilizer should be strengthened. 0.3% urea plus 0.2% potassium dihydrogen phosphate, or other fruit tree nutrient solution should be used for canopy spraying, and borax and other trace elements can also be added. The plant growth regulator protects the fruit and sprays 25 ppm of gibberellin at 3/4 Hua Xie. It is not appropriate to use 2,4-D. The young result tree wipes the summer buds every 7~10 days to protect the fruit. For some strong trees, aiming at the comparatively intense competition of nutrients in shoots, we can select branches with a thickness of 3 to 4 cm when the flower is over 2/3. The width of the ring is 2 to 3 mm, after peeling 20~ Check again about 25 days, re-rub the healed tissue on the circumcision healed in advance, weak trees should not be cut.
(2) Soil Fertility Management
In the first and second physiological droppings in mid-May, the weaker trees added a stable fruit fertilizer, mainly based on quick-acting inorganic fertilizers, and applied organic fertilizers. The application amount was about 10%-15% of the total annual amount. about. General plant Shi Hongrou Pomelo special compound fertilizer 0.5 ~ 1 kg. Continue to clear the ditches, deepen green pressure, combine rice straw and weeds to cover the surface of the earth to increase soil organic matter.
(3) Pest control
Red meat, grapefruit, and red spiders increase in temperature and breed faster. When each leaf reaches 3 to 4 heads, 25% triazotin or fenbutatin EC may be used, 1000 to 1500 times, or 73%. 2000-3000 times liquid, you can also use 99% green Ying or 99.1% of the enemy dead insect EC 300 ~ 400 times liquid. The second prevention and treatment period of red meat grapefruit scab disease was 2/3 of Hua Xie, and 80% of essential wettable powder 500 to 600 times liquid could be used, or 400 to 600 times of wettable powder could be killed. In May, it is also the breeding season for various species of oysters (Auricularia falciparum, Amaranthus falciparum, Acipenser nigromaculata, and Amaranthus tricuspidata). It is also necessary to carry out unicornis, swallowtail butterfly, leaf roller moth, gray mold, black spot disease, and resin. Disease, anthrax and other prevention and treatment. Lvrong Hongrou Pomelo Professional Cooperative (http://)
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