Cultivation technology of spring onion

1 The land preparation and fertilization planting should choose relatively flat land, and it is neutral soil with loose soil, strong water and fertility, and convenient drainage and irrigation. Soil preparation requires about 30cm deep soil, leveling and fine raking. Each hectare is applied with 45t of high-quality rotten and mature farm manure, and 450-750kg of nitrogen, phosphorus, and potassium compound fertilizer as the bottom fertilizer, and the fertilizer is applied into the 15cm cultivated layer.

2 Sowing April 5-10 Sowing, using a hoeing method, the width of the hoe is 12Ocm, in which the hoe face is 90cm, the ridges on each side are 15cm, and the row spacing is 8cm × 15cm or 10cm × 15cm. The row spacing is 8cm × 15cm, and the number of protected seedlings per hectare ranges from 63.0 to 675,000.

3 Field management

a. Fertilizer and water management Allium roots are distributed in the surface layer of the soil, and their ability to absorb fertilizer and water is weak. During the growth period, shallots should be fertilized in stages to make the plants grow lush and prepare for the formation of enlarged bulbs and provide sufficient nutrients. At the beginning of the growth of the shallots, 150 kg of ammonium sulfate and 75 kg of potassium sulfate were applied per hectare during the initial growth stage; 225 kg of ammonium sulfate was applied per hectare during the leaf growth period, and two successive application of 300 kg, 75 to 150 kg of potassium sulfate, applied 1 to 2 times continuously.

After sowing shallots, if soil moisture is good before emergence, it is not necessary to irrigate to raise ground temperature and promote rooting; if the drought is severe, it should be irrigated in time according to the moisture, but the amount of irrigation should not be too large. After the emergence of the leaves into the peak period, the number of irrigations should be appropriately increased, usually once every 7 to 8 days. After the seedlings reach a certain height, the bulb part begins to swell. At this time, the amount of irrigation should be controlled to squat the seedlings. The squatting period is 7 to 10 days. After squatting the seedlings, the spring onion enters the bulb expansion stage. At this time, the number of irrigations should be increased accordingly. Generally, the irrigation is performed every 5-6 days, and the irrigation time should be in the morning. When the bulbs are mature, the number of irrigations should be reduced, 7 to 8 days before harvesting. When the field plants begin to appear natural lodging, the irrigation should be stopped to reduce the water content of the bulbs and improve the storage stability of the bulbs. Within a certain period of time, the continuous operation of combining topdressing and irrigation is performed sequentially.

b. The main diseases of the pests are downy mildew, gray mold, purple spot, and pests such as thrips. The prevention and control of diseases and insect pests should be based on prevention. Spray medicine every 7 to 10 days after emergence, and choose sunny and windless days. Downy mildew and gray mildew can be controlled by spraying with 1500 times liquid of 75% chlorothalonil wettable powder; purple spot can be controlled by foliar spray of 72% agricultural streptomycin 2000 times, even 2 or 3 times; thrips can be used Spray control of 800-1000 times liquid of 30% Su Kexi cream.

4 Harvesting When two thirds of the plant leaves turn yellow and begin to fall in the field, when the outer scales of the bulbs become dry, harvesting is necessary. Harvesting is generally carried out before the rainy season in early July to prevent the shallots from getting rainy and easy to store.

Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone