How to grow onions

The first step in planting onions is to select good varieties, and the second step is to fertilize the border, first ploughing and fertilizing before sowing, and then sowing and raising seedlings at the right time; the third step is transplanting, in which the transplanting time of film-mulched fields is before and after the Beginning of Winter. The last step is to carry out field management.

The following are the sowing and breeding of onions:

Sowing date and quantity of ⒈

The suitable sowing time is the key to cultivate strong seedlings, such as early sowing, large seedlings, easy bolting after overwintering, weak late sowing seedlings, poor cold resistance, small phosphorus stems and low yield. Taking the Huang-Huai River Basin as an example, the best sowing date is the first and middle of September. It is best to carry out germination test before sowing. Under normal circumstances, the sowing amount of the nursery bed per mu is 4-5 kg; considering that the weak and inferior seedlings should be eliminated and thinned by 20%, the cultivation area should be 15 times that of the seeding bed, and if the germination rate is less than 70%, the sowing rate should be increased as appropriate.

⒉ cropping and fertilization

The border height is 1.4m-1.5m, the border width is 27cm, the border surface is leveled with calcium phosphate 15kg per mu, the mature organic soil fertilizer is 4 square per mu as base fertilizer, and after emergence, the available nitrogen fertilizer is applied combined with watering, and urea 10kg is applied per mu.

⒊ Underground Pest Control

There is methylene phosphate 5kg per mu, combined with soil preparation and evenly turned into the soil, fine grain leveling.

⒋ sowing

After leveling the border, water it first, and then spread it evenly. Then covered with 0.8cm nutrient soil to ensure that the seedlings were sown. If the soil moisture can not meet the requirements of seedling emergence after sowing, spray water can be used to promote seedling emergence, or it can be sowed after sprouting. Soak the seeds in cold water for no more than 12 hours, wrap them with a wet cloth and place them in a cool place of 20-24 ℃ for sprouting. Rinse with clean water once a day. When the seeds are just "white", sow in time without delay. If not sowing in time, radicle growth will cause inconvenience to the sowing work.

⒌ emergence

Attention should be paid to the prevention and control of mildew and blight after emergence. The method is to spray 30-40kg of water evenly with 50% carbendazim or 40% chlorothalonil per mu.

Generally, the yield per mu of early-maturing onion is 4500-5500kg, the mid-late maturity variety is 5000-5500kg, and the planting benefit is 3000-6000 yuan per mu, which is a good planting project.