It is very hot in summer. How to manage green onions in summer?

Generally, you should choose the land where you haven't planted onion and garlic vegetables for 2-3 years. If continuous cropping is carried out in the second year, 100 kg lime should be sprinkled on each mu for sterilization, and then replanted after drying. Slightly sandy red soil is most suitable for planting leeks. Generally, 9- 10 rows are planted in the border width (flat ditch) of10, and the hole spacing is 15cm, with 2 plants per hole. If we can't water the green onions in time, the drought in the field will affect the growth of the green onions. If there is too much water in the field, it will lead to the root retting of green onions or more diseases and insect pests. Therefore, we must choose a place with convenient watering and drainage for planting.

Generally speaking, the deeper the ridge, the longer the onion. Therefore, ridging is an important measure to soften leaf sheaths, prevent lodging and improve the yield and quality of green onions. During the formation period of green onions, intertillage and soil cultivation must be carried out, otherwise the plants will easily rot. The soil should be gradually thickened according to the seedling age. First, the fertilizer is mainly nitrogen fertilizer, with appropriate phosphorus and potassium fertilizer. Second, the former is lighter than the latter, that is, the first topdressing after beginning of autumn, and the topdressing can be urea 10 kg and compound fertilizer 5 ~ 10 kg per mu; When the weather is cool in early September, urea 15 kg and compound fertilizer 15 kg can be applied topdressing per mu.

The surface of scallion leaves is waxy and tubular, which can reduce water transpiration and resist drought. However, the root system has no root hair and poor water absorption. Therefore, all stages of growth and development of Welsh onion need suitable water to ensure that the seedlings are uniform, Miao Zhuang, robust and white, with high seed setting rate and full seeds. Varieties with cold resistance, drought resistance, heat resistance, strong adaptability and long tillering should be selected for four-season cultivation, such as China Giant Onion, Zhangqiu Onion (high-legged white Onion) or local farmers' variety Flagellate Onion. Onion varieties should not be cultivated in four seasons.

In summer, green onions are prone to gray mold, which is the main disease of green onions. White spots appear on the leaves of green onions, and there are a lot of gray mold layers on the dead leaves. At this time, it is necessary to strengthen field management, increase the application of potassium fertilizer and phosphorus fertilizer to increase leaf nutrition, and loosen the soil for green onions in time. Grass will also begin to overgrow, and when the grass grows vigorously, it will affect the absorption of seedlings. Our most commonly used method is weeding, and weeding is done 2~3 times during the whole period. There is a lot of rain in summer, and it is easy to accumulate water in the field. Drainage should be done in time, and no water should be accumulated in the field.