I. Fertilizer Ximi Pomelo Withdrawing both the leaf and flowering are in the same period and need to consume a lot of nutrients, so the emphasis on fertilization can ensure the need for pomelo tree growth. The combination of soil fertilization and external root fertilization can be used to increase the flower quality and fruiting rate.
1? Soil fertilization: The strain produces 100 kg of the resulting tree. Before the flowering, each plant of Shishimi grapefruit has 1.5 to 2 kg of special fertilizer, urea 0.75 kg or calcium nitrate 0.5 kg, or ammonium nitrate 1 kg and potassium sulfate 0.3 to 0.4 kg. , Or urea 0.75 kg plus potassium chloride 0.3 ~ 0.4 kg. The initial result tree can be applied to 0.75 kg of ammonium bicarbonate mixed 0.75 kg of superphosphate, 0.15 kg of potassium sulfate; or 0.5 kg of Shimiyou grapefruit and 0.1 kg of urea. Young trees are treated with a small amount of ammonium bicarbonate plus superphosphate or buried. At the same time, it is necessary to pay attention to supplementing the fertilizer before flowering. In the 10 to 15 days before flowering, it is necessary to supplement one chemical fertilizer based on available nitrogen fertilizer to benefit the strong flowers. The tree producing 50 kilograms can control the use of calcium nitrate or 0.5 kilogram of ammonium nitrate. Or pomelo special fertilizer 0.5 kg.
2?External spraying: before flowering, add 50~100 grams of imported urea and 100~150 grams of urea, 25 grams of ammonium molybdate, 100 grams of potassium chloride, 200 grams of magnesium sulfate, and 130 to 150 milliliters of nutrient solution. 10 to 15 days before spraying again; flowering with 50 grams of boric acid, 25 grams of ammonium molybdate watered with 50 kg spraying, sprayed every 5 to 7 days, continuous spray 2 to 3 times; flower Xie 2/3 Use flowers and fruit nutrient solution 150 ml, 200 g of magnesium sulfate, 100 g of potassium dihydrogen phosphate, 150 g of imported urea and 50 kg of water to spray; 7-10 days after the flower can be sprayed properly. For every 50 kilograms of water, add "92,000" 1 gram.
Second, pay attention to spring cut as much as possible to put spring shoots, trim when appropriate to remove the top of the crown and the periphery of dense spring shoots. The spring tip of the top can be cut off by 1/3 to 2/3 of the spring shoots of the year to ease the growth potential, reduce nutrient consumption in the tree, reduce the degree of competition for shoots and flowers, and improve flower quality.
Third, thinning and sparse fruit thinning remove weak flowers, deformed flowers, spend a lot of trees to carry out sparsely. At the same time, sparse buds, leaving 2 to 4 flower buds per ear. A large number of flowering trees can leave 80 to 120 robust spikes per plant. The thinning fruit was carried out after the second physiological fruit drop, and the deformed fruit and weak fruit were removed.
Fourth, the ring cut fruit flower Xie 1/2 when the results of the branch spiral ring cut 2 to 3 rings, increase nutrition accumulation, improve the fruit rate.
V. Pest Control The major pests during the flowering period are anthracnose, scab, buds, aphids, red spiders and leaf nails. The disease prevention and control is carried out when the spring shoots are drawn out at 2 cm. The medicine is made of copper soap, thiophanate, carbendazim, copper and strong oxychlorinated copper, etc.; pest control, flower buds are planted in the whole garden before flower buds are exposed. 605 powder, or combined with the control of locusts, leaf beetles, and spider mites, etc., before and after flowering to spray dichlorvos and trichlorfon.
Sixth, ring cutting non-healing and yellowing tree treatment 1? Non-healing tree treatment: circumcision width is too large, excessive weight with knife or pesticide pollution caused by circumcision does not heal the tree in time to the original wound of the upper and lower phloem again injure, Create a new wound, scrape the rot, coat with black tape or blue plastic film, or coat the wound with fresh cow dung mixed with red earth so that the wound will heal as soon as possible. 2? yellowing tree treatment: Each plant with root nutrient solution 100 grams, 100 grams of potassium dihydrogen phosphate, 150 grams of calcium nitrate water 25 kilograms rhizome pouring 2 to 3 times, while strengthening the root dressing.
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