Onion later management measures 1. Watering bulb expansion water In the bulb expansion period, the onion water requirement increases rapidly. It is necessary to dilute the water and pour small water, and water it once every 5-6 days to promote the rapid growth of the bulb and stop it 1 week before harvest. Irrigation. (2) chase bulb expansion fertilizer (1) re-expansion of large-scale fertilizer: in early May application of urea 25-30 kg per mu, 15-20 kg of potassium sulfate or 15 kg of diammonium phosphate, urea 10 kg, with the best results; In the middle and late May of the month, 5-10 kilograms of urea or onion-specific fertilizer should be applied per acre with watering. (2) Spraying foliar fertilizer: In the early stage of bulb expansion, several foliar fertilizers are sprayed in combination with disease prevention to prevent premature aging of onion plants and promote bulb enlargement. The specific method is: in the middle of May, use 0.15 kg of potassium dihydrogen phosphate per acre + 10 ml of high yield spirit or add 50 grams of brown sugar, 50 grams of urea, 60 grams of potassium dihydrogen phosphate, or -1204.0 ml of Yunda for spraying. , spray 2-3 times, can get good results. 3. Do not constantly check the growing situation of onion plants in the field and find that there are early twitching plants that must be removed in time to prevent over-consumption of nutrients and affect bulb enlargement. 4. Disease and Pest Control (1) The disease in late onion is mainly downy mildew. The disease mainly damages the leaves of the plants and has a great impact on the yield. It should be controlled in time after discovery. In the early stage of disease, 90% triethylaluminum phosphate wettable powder 400 times liquid, 64% antitoxic powder wettable powder 500 times liquid, and 58% metalaxyl manganese zinc wettable powder 500 times liquid were sprayed. Usually spray 7 to 10 days, even spray 2 to 3 times. During the epidemic period of disease, it is necessary to replace 50% Dimethomorph Morpho Manganese Zinc (Anke) WP 1000 times, 72.2% Promicarb (800 grams) Aqueous 800 times or 72% urea Zinc Manganate ( Kelu) WP 600 times liquid and other highly effective therapeutic agents for spraying, spray once every 5 to 7 days, and even spray 3 to 4 times, can effectively prevent and prevent the disease. (2) The onion pests mainly include root larvae, leaf miners and onion thrips. For prevention and treatment of root canal, spray 48% of Loester Ben EC at 1000-1500 times every 7-10 days in the initial stage of the disease, and spray 2 or 3 times; control the leaf-flying fly, it is during its spawning period until the hatching of the larvae. In the initial stage, spray 2-3 times of 2.5% deltamethrin or 20% fenvalerate or other pyrethroid pesticides for 1500-2000 times; control the onion thrips, spray 5% sharp at the peak of their nymphs. Special suspending agent 3000 times or 10% imidacloprid wettable powder 2500 times, spray every 7 to 10 days, even spray 2 to 3 times.
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