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Winter and spring vegetable seedlings prevent abnormal
In the winter and spring vegetables growing process, abnormal seedlings often appear due to weather changes, improper management, and other reasons. The prevention and control methods for some common abnormal seedlings are now described as follows: Root seedlings: caused by high humidity and low temperature in seedbeds. Control measures: First, choose a soil with strong permeability to make the seedbed; Second, use the geothermal line to raise the seedlings so that the seedbed temperature is maintained at 20-25°C during the day and 15°C during the night; thirdly, control watering; , To promptly ventilate and drain moisture, but also to spread fine dry soil and ash. Actually seedlings: caused by high seeding rate and high temperature and high humidity after emergence. Prevention and control measures: First, strictly control the amount of seeding; Second, when the seedlings grow congested, and time seedlings, seedlings; the third is to expand the row spacing when the seedlings, to prevent excessive shade; Fourth, try to increase light, even in cloudy days should also be appropriate Expose the wolfberry to make the seedlings more visible light; Fifth, control the watering; Sixth, spray 0.2% glutinous liquid fertilizer plus 0.2-0.3% potassium dihydrogen phosphate solution, to promote seedlings turn strong. Aging seedlings: caused by large age or seedlings. Prevention measures: First, strictly control the age of seedlings, and the length of seedlings should be appropriate. Second, during the seedling stage, the low temperature time should not be too long to prevent the long-term drought caused by the aging of the seedlings. The seedlings should preferably adopt the method of controlling temperature without controlling water; For aging seedlings, 10-30 ppm of gibberellin solution and 300-500 times potassium dihydrogen phosphate can be sprayed per square meter of seedbed to stimulate seedling growth. Frozen seedlings: caused by low seedbed temperature. Prevention measures: First, improve the means of raising seedlings, artificial temperature control seedlings, such as electric hotbed nursery; the second is to strengthen the night insulation measures before the onset of the cold current, such as thick grass cover, covered paper, covered with a small shed, etc., and try to Keep dry, prevent rain and snow from getting wet, and take warming measures such as raw fire when necessary; third is to properly control watering, increase phosphate fertilizer reasonably, and improve the cold resistance of the seedlings; Fourth, spray the nutrient solution on the frozen seedlings, The formula for the nutrient solution was: 30 ml of glutinous liquid fertilizer, 250 g of sugar, 1 g of gibberellin, 0.3 g of rooting powder, and 15 kg of water. Drug hazards: caused by excessive application of pesticides, high concentrations, or premature construction of seedbeds. Preventive measures: First, scientific and rational use of drugs; Second, the seedbed before use to maintain moisture; Third, after the occurrence of phytotoxicity, it is necessary to spray water or ease the drug, such as the occurrence of Fu Mei Kun sprayed 0.2% zinc sulfate solution, the occurrence of Diguo medicine When sprayed, 0.2% borax or boric acid solution was sprayed, and when the paclobutrazol injury occurred, 0.05% gibberellin solution was sprayed. Weeping seedlings: It is caused by the sudden release of continuous rainy weather. Prevention and control measures: First, in the event of a sudden overcast day, the seedlings should be gradually exposed to light. Do not immediately uncover all the coverings. They should be removed in batches to gradually increase the light. Second, the seedlings should be wilted soon after the exposing. It is necessary to immediately cover the mold, and then reopen the seedlings after the seedlings return to normal, and avoid watering the wilt seedlings. Wearing a hat seedling: The seedbed is too dry and the soil is too thin. Prevention and control measures: First, the bottom water of the seedbed should be sufficient; Second, the thickness of the cover soil should be uniform and appropriate, such as the thickness of the cover soil for cultivating peppers and eggplants is 1 cm, and the thickness of the cover soil for cultivation of cucumbers is 1.5 cm; third, the front bed of the seedling after sowing Should cover the mulch, keep the soil moist; Fourth, the emergence of hat seedlings can be sprayed first, until the species shell moisture and then gently brush the shell removed with a brush.