Onion white is the bulb near the root of Liliaceae onion, which is simply the lower part of onion. Onion white has no leaves and is colored. Onion is the essence of onion. If you want to see whether the green onions grow well, you have to see whether the green onions are thick or not, and the color is not white. If the color of onion is yellow with white, then this onion is not a good onion.
Onion is cylindrical, bulb skin is white, sparse reddish brown, leaves are cylindrical, hollow, scape is cylindrical, up to 100 cm, swollen below the middle, involucre membranous, umbel spherical, white and nearly oval in color; The ovary is obovate, the style is slender, and the flowering and fruiting period is April to July.
Post-sowing management of scallion
Seedlings are usually sown in autumn for 6-8 days. Because of the high temperature at that time, the seedbed should be watered frequently, covered with plastic film after sowing, and pulled out in time when seedlings emerged. Seedbeds should be watered according to soil conditions. Generally, the seedlings are watered once, and the frozen soil is watered for the winter. After freezing water is poured, a layer of horse manure, soil mixed fertilizer or plant ash 1-2 cm can be sprinkled on the seedbed, which is beneficial to the cold and moisture preservation of seedlings and safe wintering.
In the following spring, after the soil is thawed, the plastic film should be pulled out of the border in time. When the seedling grows three true leaves, it should be combined with water topdressing for 2-3 times, with ammonium sulfate about 15 kg or urea 6-7 kg each time. At the same time, weeds should be pulled out in time for secondary thinning after approaching green; About 7 days before planting, stop watering, resume hardening seedlings and improve the survival rate of planting.
Before planting, the healthy seedlings of school age are 40-50 cm high, the stem diameter is 65,438+0.0-0.5 cm, the root system is developed, the leaves are free from yellow shoots and diseases and insect pests, and 5-8 mu of onion seedlings can be planted per mu. ?