What is the correct method for transplanting onions?
How do you transplant onions? A detailed introduction to onion transplanting: plant at the right time. Onions should not be grown after onions on the same land. Apply 4000-5000 kg of high-quality decomposed organic fertilizer, 40-50 kg of diammonium phosphate, and 30 kg of potassium sulfate per mu to the planting site. Level the land into beds, with the bed width depending on the width of the plastic mulch. Water before covering the film, and after the water has infiltrated, spray 150 ml of 33...
How do you transplant onions? A detailed introduction
Onion transplanting:
Plant at the right time. Onions should not be grown after onions on the same land. Apply 4000-5000 kg of high-quality decomposed organic fertilizer, 40-50 kg of diammonium phosphate, and 30 kg of potassium sulfate per mu to the planting site. Level the land into beds, with the bed width depending on the width of the plastic mulch. Water before covering the film, and after the water has infiltrated, spray 150 ml of 33% pendimethalin herbicide per mu. After covering the film and before planting, punch holes at a spacing of 16 cm x 16 cm between plants and rows. Select strong seedlings that are 55-60 days old, with a plant diameter of 5-8 mm, a plant height of 20 cm, and 3-4 true leaves for planting. The generally suitable planting period is November 1 to 10. The planting depth should be about 1 cm above the bulb. Generally, 22,000 to 24,000 plants are planted per mu.
Field management. After transplanting, autumn-sown onions can be left to overwinter naturally. Water once before the soil freezes, and water once when growth resumes the following year, applying a quick-acting nitrogen fertilizer with the water to promote early seedling growth. During the bulb enlargement stage, increase the frequency of watering, generally once every 7-10 days, keeping the soil surface moist, and stop watering 10 days before harvest. The bulb enlargement stage is the key period for topdressing. Apply 15 kg of urea and 20 kg of potassium sulfate, or 30 kg of NPK compound fertilizer, per mu each time. Note that the last topdressing should be more than 30 days before harvest.
Pest and disease control. Onions are susceptible to downy mildew, purple blotch, and rust. For downy mildew and purple blotch, after growth resumes, spray 75% chlorothalonil at 600 times dilution or 25% metalaxyl at 800 times dilution, using 40 kg per mu each time. For rust, spray 20 g of 12.5% difenoconazole per mu diluted in 40 kg of water, once every 10-15 days, for 2-3 consecutive sprays. For onion maggots, mix 1 kg of Tiannuo Xianjing with 15-20 kg of fine soil, spread it evenly around the roots, and cover with soil. For onion thrips, spray dimethoate at 1500 times dilution.
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