Onion high temperature period management
Onion likes the cold climate and is not heat resistant. In recent days, continuous high-temperature environment has inhibited the normal growth of scallion, and heavy rain has increased the incidence and prevalence of onion disease. Therefore, grasping the management of green onions during the high temperature period and creating a suitable growth environment for light green growth are the key to improving the yield and quality of green onions.
First of all, to promote roots and strong trees. After the welsh onion is planted, it enters the high temperature season. At this time, the center of management is to promote rooting. It is necessary to control watering, prevent waterlogging after rain, strengthen cultivator, and promote root growth. When welsh onion enters the primeval period, the requirement for water and fertilizer increases. The first time dressing should be combined with irrigation, and 20 tons of urea can be topdressed with potassium nitrate or potassium dihydrogen phosphate. When the green onion into the light blue formation period, is the key period for the Zhuang tree to increase the yield, this time can be chasing two fertilizers respectively, with quick-acting nitrogen fertilizer, with topdressing phosphorus, potash fertilizer. The soil should always be kept moist to meet the light green growth needs.
Second, earth. In general, the deeper the soil, the longer the light blue will be. Therefore, the soil is an important measure to soften the leaf sheath, prevent lodging, and increase the yield and quality of green onions. The cultivating soil must be carried out during the formation of light blue, otherwise it will easily cause plant rot. When soil is used, it should be gradually thickened according to the age of the seedlings. After the beginning of autumn, soil should be cultivated once every half a month, and a total of 3-4 times of earth is cultivated. This is a key measure to increase the length of light blue rice. Ploughing should be carried out when the leaves are soft in the afternoon. Avoid cultivating soil to damage the leaves when it is crisp in the morning. It is advisable to raise the height of the soil so as not to affect the growth of green onions. (In general, the seedlings should be lighter than the seedlings. With the increase in the number of earth-cultivation, the earth should be thicker and thicker. The thickness of each soil should be cultivated to the exit of the last leaf, and the last earth should generally be 15 cm above the ground. Must not bury the heart and leaves, so as not to affect the growth of green onions and root and plant rot.The specific operation should master the first half of the earth is half the depth of the ditch, the second earth and the ground level, the third time training into low ridge, the fourth Times cultivated into high ridge).
In addition, pest control. The high-temperature stage is the growth and decline of green onions, and is susceptible to diseases, mainly on onion downy mildew and disease. Disease prevention and control is not difficult, it is mainly to do early prevention. It is recommended to spray 1 time Amistar 1500 times solution or dinytaxamide 1000 times solution or chlorothalonil 500 times solution at the seedling stage of transplanting, and then The addition of streptomycin can effectively prevent fungal and bacterial diseases. After the beginning of autumn, if scallion is sick, Ami Miao can receive 1500 times liquid or Jinlei 600 times liquid or Prec 700 times liquid. The main pests of Welsh onion are thrips and leaf miners. Weeds must first be eliminated and then sprayed with Aketai 3000 times or dish 1000 times.
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