How to do on-the-spot water and fertilizer management
At the time of onion planting management, the following work needs to be done: Checking the pond to fill the gap: After planting, check whether there are dead seedlings and missing ponds, and timely replenish seedlings to ensure full seedlings. Irrigation: According to the soil conditions and plant growth, timely irrigation, promote small water dip irrigation, stop irrigation in the first half of harvest.
Top dressing: After planting the seedlings, combine the irrigation with the water to catch the seedling fertilizer, use 8-10 kg of urea per acre, pour the water, and then use the urea 10-15 kg for the second time every 15-20 days. When the bulb begins to expand, it should be chased once, and 20 kg of urea per acre, 15 kg of potassium sulfate, 30 kg of calcium, and water should be applied. The fertilizer should be stopped one month before harvest.
Pest control: 1. Leaf blight and purple spot disease: The land with heavy disease should be 3-4 years old with non-onion garlic crops. Since the pathogen can be attached to the seed and spread, 50% thiram, 50% carbendazim or 50% thiophanate wettable powder can be used for seed dressing at 0.4% of the seed weight. In the early stage of the disease, use 75% chlorothalonil WP, 64% chlorpyrifos WP, 70% mancozeb, 40% Dafudan WP, 58% metalaxyl MnZn 500 times water, or 50% chlorhexidine WP can be sprayed against 1500 times of water. If the onion and horse are at the same time, the above pesticides can be mixed with 2.5% deltamethrin or 20% chlorpyrifos to treat the onion horse.
2. Species: The flies have a tendency to produce manure, and the manure must be fully rotted. Adults can be sprayed with 20% chrysanthemum emulsifiable concentrate 3000 times solution, 20% fluoride emulsifiable concentrate, and 10% bromo margarine 2000 times solution. In addition to larvae, 50% phoxim emulsifiable concentrate 500 times or 90% crystalline trichlorfon 800-1000 times solution should be used for root irrigation.
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