In the spring, it is the key season for the emergence of new shoots, flowering fruits, and pest control in citrus. Therefore, the spring management should focus on promoting new shoots, keeping flowers and fruits, improving flower quality, enhancing the resilience of trees, and improving pest control. Focus on work.
First, fertilization
Promote the development of strong spring shoots, promote flowering and fruit setting, and lay the foundation for high yield and stable production. Spring fertilization should be applied early, from the end of February to the beginning of March; the quick-acting nitrogen fertilizer is mainly used together with the application of phosphorus and potash fertilizers and decomposed organic fertilizer; the fertilizer amount is determined according to the age of the citrus fruit tree, the tree vigor, and the result amount: usually weak tree vigor and tree age Larger results are more likely to be applied, and vice versa. Under normal circumstances, citrus trees with a yield of 30 to 50 kilograms will be used to produce 40 to 80 kilograms of livestock manure water, and 2 to 3 kilograms of compound fertilizers for fruit trees will be used. Water will be irrigated at the same time; the young trees will be dominated by nitrogenous fertilizers. Shi, 1 or 2 times a month, the application of urea 1 to 2 strains, 10 kg of manure. For the saplings planted last autumn and later, no fertilization is applied. After the spring shoots turn green, appropriate amount of clearing water is applied. Fertilization method: the result tree is digging 2 to 3 deep in the canopy dripping line, each width 20 to 30cm, about 50cm long fertilization ditch, fertilization is strictly prohibited and one-way partial application, so as not to burn roots or partial growth, Cover soil immediately after fertilization to reduce nutrient losses and increase fertilizer utilization. Saplings dig in shallow nests along the outside of the nest.
Second, pest and disease prevention
1. Prevention of citrus red and yellow spiders: In late February, the whole park sprayed 0.8-1.2 bumeide lime sulfur to prevent pests. At the end of February, the tree was observed, and 100 pieces of annual leaves had fleas and 100 eggs to start drug control. Green biological pesticides were selected, and 2000 times liquid Nissoline could be used. , General continuous spraying 2 to 3 times, each time interval of 10 days.
2. The prevention and treatment of citrus flower buds: In late March, buds were used to control the growth of mung bean, phoxim and dimehyposol were used, 500 times liquid was sprayed on the soil of the tree, and 1000 times liquid was sprayed on the canopy. In addition, the flower buds were removed and the damaged buds were burned or buried deeply.
3. Prevention and treatment of arrowhead warts: The prevention and treatment time starts from late April to mid-May, spraying twice consecutively, that is, spraying the first time in late April and spraying the second time every 10 days or so. Can choose speed kill 1000 ~ 1500 times, speed kill or fruit St. 800 ~ 1000 times liquid.
4. Prevention and treatment of papilio larvae: In the occurrence period of papilio larvae, it can be used to kill and spray 90% trichlorfon 800-1000 times to control.
5. Anthracnose prevention and treatment: When the new shoot grows 2 centimeters in length, the medicine is used for prevention and treatment. The main agent is 70% thiophanate-methyl 800-1200 times solution or 70% Dasheng-M600-800 times solution.
Third, Baohuabaoguo
1. When the spring shoots turned green, the crown was sprayed with 0.3% urea + 0.2% potassium dihydrogen phosphate mixture. Every 7 to 10 days, spray 2 to 3 times continuously.
2. From the beginning of flowering to full flowering, the canopy was sprayed 1 or 2 times with 0.1% borax + 0.2% potassium dihydrogen phosphate + 0.5% urea mixture. Xie spend 2/3 when spraying a mixture of 25PPM, 90% + 0.2% potassium dihydrogen phosphate, spray again every 15 days, or fruit with mostly fruits.
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