From early May to late June, the seedlings planted can be classified as shallots; It can also be used to plant furrow onions in flat beds (pinch onions) or narrow row spacing, which can be used as autumn onions before and after long summer, or as early spring croissants after wintering.
2. Spring planting time: Sow in early spring after soil thawing, supply as shallots before the arrival of hot summer, or harvest as dried shallots or furrowed shallots in the year after planting. It can also be used as croissants or as seed plants to keep seeds in winter.
3. Summer planting time: it is usually planted from late July to early August, so it is also called green onion. When overwintering in the same year, the plants were larger, and the vernalization process was easy to complete. In the next spring, they germinated early and bolting and flowering quickly. Generally, chopped green onion is listed after it is collected.
Extended data:
Planting conditions of scallion
1. Soil: Onion is suitable for loam with pH6.5-7.5. The nursery site requires loose fertilizer and sufficient soil moisture, and the surface soil should be prevented from hardening at seedling stage. When seedlings begin to grow rapidly, topdressing should be done once, and soil moisture should be controlled 10- 15 days before planting to prevent overgrowth and lodging.
2. Fertilizer: Green onions like fertilizer and need a balanced application of nitrogen, phosphorus and potassium. The demand for nitrogen fertilizer is more in the early stage of growth, and more phosphorus and potassium fertilizer are needed in the later stage. Pay special attention to the application of phosphate fertilizer, because the lack of phosphate fertilizer will lead to poor plant growth and decreased yield. At the same time, we should pay attention to the sulfur content in onion field, and the lack of sulfur in soil will affect the effect of increasing production.
3, temperature: green onions are compressive, both cold and heat resistant. Although the overall temperature has little effect on the growth of green onions, suitable temperature conditions are beneficial to the quality and high yield of green onions.
4. Moisture: The root hair of green onion is less, and its ability to absorb water and fertilizer is poor. Roots are mostly distributed in the surface layer of soil, and they like moisture, which requires high soil moisture, but they are afraid of waterlogging, and high temperature and humidity are easy to cause root death.
5. illumination: green onions need moderate illumination intensity. Because the tubular leaves of Chinese onion can still get good lighting conditions under the condition of close planting, there is no need for strong light. Strong light has an adverse effect on the growth of green onions, which will lead to leaf senescence, fiber increase, quality decline and even loss of edible value.