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Early spring vegetable seedlings prevent abnormal technical measures
In early spring, the weather is changeable, and the cold air is frequent, and the temperature fluctuates. After a relatively large drop in temperature, the seedlings of long cowpeas, watermelons, and potatoes suffered various degrees of frost damage. As the weather turned fine, the temperature in the shed suddenly rose, causing crop shoots to grow and grow in appearance. The prevention and control measures for diseased seedlings in early spring are described as follows: 1. Frozen seedlings are caused by low seedbed temperature. Control methods: 1 improve the means of raising seedlings, the use of artificial temperature control seedlings, such as electric hotbeds, etc.; 2 warm freeze, before the arrival of the cold, strengthen the night insulation, such as thick straw, covered with a small arch shed; if necessary, take warming measures , Such as the production of stoves; 3 appropriate control of watering, a reasonable increase in phosphate fertilizer, to improve the cold resistance of seedlings; 4 sprayed on the frozen seedlings nutrient solution. Nutrient solution formula: spray Shibao 30 mg, gibberellin 1 g, 0.3 g rooting powder, watered 15 kg. Second, root seedlings (brown roots rotten seedlings), is caused by low temperature humidity seedbed. Prevention and control measures: 1 Select soil with good permeability to make seedbeds and try to raise the ground temperature; 2 Use electric wire to raise seedlings to keep seedbed temperature at 20-25°C during daytime, and 15°C at night; 3 Control watering; 4 Once roots develop, timely ventilation Dehumidify and apply fine dry soil and ash to absorb moisture. Third, leggy seedlings, is a large amount of sowing, after the emergence of high temperature and humidity caused by the shed. Preventive measures: 1 Strictly control the seeding rate; 2 kinds of seedlings when the growth is crowded, and the time seedlings seedlings; 3 as much as possible to increase the light, even in cloudy days should also be properly exposed, so that the seedlings see the light; 4 control watering; 5 leaf surface Spray 0.2% Pensuba plus 0.2%-0.3% potassium dihydrogen phosphate, to promote seedlings turn strong. 4. The wilting seedlings are caused by all the uncovered carpets 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 covers. Remove them in batches and gradually increase the light. If the seedlings are found to be wilting soon after the cover is uncovered, cover them immediately and wait until the seedlings return to normal before they are exposed. Do not water the wilt seedlings. Fifth, wearing a hat seedling is caused by the seedbed being too thin and covering the soil. Control measures: 1 seedbed bottom water should be sufficient; 2 uniform thickness of the cover. Such as pepper, eggplant thickness of 1 cm, 1.5 cm cucumber; 3 seedling before the emergence of seedlings, seedbeds cover the mulch to keep the soil moist. 4 When the hat seedlings appear, they can spray water first. After the seed shells are wet, brush the caps off with a brush. Sixth, the aging seedlings are caused by the prolonged seedlings and the long seedlings. Prevention and control measures: 1 Strictly control the age of seedlings, when seedlings are exposed to low temperature for a long time, and prolonged drought causes aging seedlings; 2 seedlings are best used in methods that do not control temperature; 3 pairs of aging seedlings are sprayed on the seedbed per square meter 10 -30 units of gibberellin plus 0.2% sprayed Shibao or 300-500 times potassium dihydrogen phosphate to stimulate seedling growth.