Early spring vegetable seedlings prevent abnormal seedlings
In early spring, the weather changes and the temperature rises and falls. The low temperature will cause seedlings such as long cowpeas and tomatoes that have been cultivated in the shed to suffer various degrees of freezing damage. After the cold air passed, as the weather cleared, the temperature in the shed suddenly rose, resulting in crop shoots and wilting. The preventive measures for abnormal seedlings that often occur in early spring are described below: Frozen seedlings are mainly caused by low seedbed temperature. Control methods: 1. Improve the means of raising seedlings, using artificial temperature-controlled seedlings, such as electric hotbeds. 2. To keep warm and prevent freezing, to strengthen the night insulation, such as stamping a thick straw curtain, erecting a small arch shed, etc., and if necessary, heating the stove. 3. Appropriate control of watering, reasonable increase of phosphate fertilizer, improve the cold resistance of seedlings. 4. Spraying the frozen seedlings with nutrient solution and nutrient solution: 30 ml of Penshibao, 0.3 g of rooting powder and 15 kg of water. The root seedlings are mainly caused by the humidity of the seedbed and the low temperature. Control measures: 1. Select a soil with good air permeability as seedbed and try to increase the temperature. 2. Use electric wire to raise the seedlings so that the temperature of the seedbed is kept at 20~25°C during the day and 15°C at night. 3. Control watering. 4. Once roots develop, promptly ventilate and drain moisture. Spread fine dry soil and ash. The leggy seedlings are mainly due to high seeding rate and caused by high temperature and high humidity after emergence. Control measures: 1. Strictly control the sowing amount. 2. Seedlings grow in crowded conditions and seedlings in time. 3. Increase lighting as much as possible, even on cloudy days, make sure that the seedlings are exposed. 4. Control the watering, foliar spray 0.2% spray plus 0.2% ~ 3% potassium dihydrogen phosphate mixed solution, to promote seedlings turn strong. The wilt seedlings are mainly caused by all the uncovered rains after the continuous rainy weather turns fine. Preventive measures: In the event of a sudden turn of rain after continuous rain, it is necessary to gradually see the seedlings. Do not immediately uncover all the coverings. Remove them in batches and gradually increase the light. If some seedlings are found to be wilting after being exposed for a long time, they must be covered immediately. After the seedlings return to normal, they should be re-opened and the water should not be watered. The seedlings of this seedling are caused by the seedbed being too dry and covering the soil too thin. Control measures: 1. Bottom water should be sufficient. 2. The thickness of the cover soil is uniform and appropriate, such as the thickness of pepper, eggplant 1 cm, cucumber 1.5 cm. 3. Before emergence, the seedbed covers the mulch to keep the soil moist. 4. When the seedlings appear, spray the water first. After the moisture of the seed shell is absorbed, brush the seed shell gently with the brush. Aging seedlings are mainly caused by long seedlings and long seedlings. Preventive measures: 1. Strictly control the age of seedlings, when the seedlings are not allowed to be cold for a long time and prolonged drought, it is best to use methods that do not control water. 2. For aging seedlings, spray a 300-500-fold potassium dihydrogen phosphate mixed solution per square meter of seedbed to stimulate seedling growth. Cabinet Hinges,Cabinet Door Hinges,Adjusting Cabinet Hinges,Kitchen Cabinet Door Hinges ZHEJIANG ZHONGZHENG LOCK INDUSTRY CO.,LTD , https://www.zhongzhengcabinetlock.com