How to manage scallion in high temperature period?

How to manage green onions at high temperature? Please introduce green onions like cool climate, not heat-resistant. In recent days, the continuous high temperature environment has inhibited the normal growth of Welsh onion, and the heavy rain has aggravated the occurrence and epidemic of Welsh onion disease. Therefore, it is the key to improve the yield and quality of green onions to do a good job in the management of high temperature period and create a suitable growth environment for the growth of green onions. First of all, promote the root and grow strong. Green onions enter the high temperature season after planting, at this time the center of management is to promote root, we should control watering, drainage and waterlogging after rain, strengthen mid-tillage and promote root growth. When Welsh onion enters the peak period of leaf development, the demand for water and fertilizer increases, so the first topdressing should be combined with irrigation, 20 jin of urea can be applied per mu, combined with potassium nitrate or potassium dihydrogen phosphate. When green onion enters the green onion white formation period, it is the key period for strong trees to increase their yield. At this time, two times of fertilizer can be applied, mainly available nitrogen fertilizer, combined with phosphorus and potassium fertilizer. The soil should always be kept moist to meet the growth needs of green onions. Secondly, cultivate the soil. Generally speaking, the deeper the soil is, the longer the onion will be. Therefore, soil cultivation is an important measure to soften the leaf sheath, prevent lodging and improve the yield and quality of green onions. The cultivation of soil must be carried out in the green onion formation period, otherwise it is easy to cause plant rot. When cultivating the soil, it should be gradually thickened according to the age of the seedlings. The Beginning of Autumn should cultivate the soil once every half month for a total of 3-4 times, which is the key measure to increase the length of green onions. Soil cultivation should be carried out when the leaves are soft in the afternoon, do not damage the leaves when they are crisp and tender in the morning, and the height of the soil should not bury the heart leaves, so as not to affect the growth of green onions. (generally speaking, the soil should be cultivated shallower when the seedlings are young. With the increase of the number of times of soil cultivation, the soil becomes thicker and thicker. Each time the thickness of the soil should be cultivated to the exit of the last leaf. The last cultivation of the soil should generally be higher than the ground 15cm, so as not to bury the heart leaves, so as not to affect the growth of green onions and cause root and plant rot. The specific operation should be mastered that the first soil cultivation is half of the ditch depth, the second soil cultivation is flat with the ground, the third time is short ridge, and the fourth time is high ridge). In addition, prevent and control diseases and insect pests. The high temperature stage is the weakening period of Welsh onion growth, which is easy to be infected with diseases, mainly Welsh onion downy mildew and blight. It is not difficult to prevent and cure the disease, and it is mainly to prevent it early. It is suggested that 1500 times of Amisi or 1000 times of diethynyl amide or 1000 times of chlorothalonil should be sprayed once in the slow seedling stage, and then mixed with streptomycin, which can effectively prevent fungal and bacterial diseases. After the Beginning of Autumn, if green onions get sick, you can use Ami Miao 1500 times liquid or Jinlei 600x liquid or Prik 700x liquid for prevention and treatment. The main pests of green onions are onion thrips and leaf miners. Weeds in the field should be eliminated first, and then 3000 times of Aktai or 1000 times of vegetable Xi should be sprayed. Click to get more green onion planting techniques click to get more vegetable planting techniques