Summer temperatures are high, and celery seedlings have become difficult. Recently, the author received telephone calls from farmers in various parts of Shandong and asked about celery seedlings. The author suggests:
First, pay attention to control the germination temperature in summer due to high outside temperature, germination difficulties, can be adapted to local conditions, find some cool places. Such as: basements, cellars, caves, electric wells, shade, under the cucumber stand. Some can germinate the seed by hanging it in a well 20 centimeters from the water surface. Seeds under the appropriate environmental conditions, the best temperature control at 15 ~ 20 °C place germination, after about 10 days, they can be "white", that is, germination. There is also a germination method is to soak seeds, rinse the seeds, remove and dry, wrapped with wet cotton cloth or gauze, buried in wet soil germination. Seeds should be buried in a cool, moist place. Such as after the house, cucumber stand and so on. Do not bury it too deeply when it is buried. Normally, the seed covers 3 to 4 cm. Sprinkle fresh water every day in the area where the seeds are buried. Remove the seeds every two days and flush them with clean water until the seeds germinate.
Second, prevention of continuous cropping or soil compaction is often caused by two reasons: First, bed soil is not good soil; the other is the lack of bottom water, humus content is small, the structure is not loose, it is prone to compaction, resulting in rooting dead seedling phenomenon. In addition, celery seeds are small and have limited nutrients for storage, and they have few root systems immediately after emergence, and are sensitive to soil moisture and temperature. Symptoms of "hanging" or "boiled" seedlings are prone to occur in drought and high temperature environments. Therefore, we must choose soil loose, fertile, rich in soil organic matter content, permeability and good water retention, convenient drainage, irrigation, cool and cool plots to build a seedbed. Avoid breeding seedlings in continuous plots to avoid causing soil-borne pest damage.
Third, the selection of qualified seed wolfberry grains and Chen seeds generally weak vitality, germination is slow, germination is difficult; Second, celery is like cold, cold and heat, poor drought tolerance, ability to dry seed sowing in summer or under strong light irradiation Slower; Third, uneven seed sowing, uneven environmental conditions or cover, resulting in uneven emergence.
Fourth, the scientific use of fertilizer N fertilizer is too much, resulting in leggy seedlings, due to slender stems, leaves thin pale, soft tissue, root less, when the temperature is too high, especially when the night temperature is too high, the respiration of seedlings enhanced, consumption of More nutrients, vulnerable weak seedlings, resulting in dead seedlings.
5. Shade and rain protection The environment of high temperature, strong light and heavy rain in summer is not conducive to the emergence of celery, so it is necessary to protect the seedlings from sun and rain. After sowing, the height of the scaffolding at the top of the gong is 1 meter. The mulch is covered with straw, straw or shade to cover the shade and moisturize. Immediately after the emergence of the seedlings, remove the cover from the surface. If covering wheat straw or straw curtains, the seedbed should be watered first, and conditions should continue to be shaded. Seed beds should always be moist, but they should not be flooded. Weather protection can also be covered with old plastic sheeting. It is rolled up about 40 centimeters from the ground in order to facilitate ventilation and smear with mud. If it is washed out by rain, it should be recoated. When 2 to 3 true leaves are to be removed from the seedlings, they should be promptly filled after the withdrawal.
Six, pay attention to the prevention and control of underground pests to control earthworms and other underground pests, bran can be fried in the pot, add 90% trichlorfon mix well made bait, sprinkled around the seedbed.
7. Strengthen the Seedling Management After the general sowing, the temperature of the seedbed should be controlled at 15~20°C, and the relative humidity of the soil should be maintained at about 85%. The seedlings can be established in 8~10 days. After the seedlings were planted, the second seedlings were firstly planted, and the second seedlings were planted 10 days later with a seedling distance of 1 to 1.5 cm. The third seedling was planted one month later and the seedling distance was 5 cm. The seedlings that emerged from the seedlings could be further shifted by 5 cm. Planting, watering after planting can effectively save seedlings. After seedling emergence and post-transplantation, post-seedling and post-emergence must be followed by the application of clear water to promote seedlings, and seedlings must maintain the soil moisture and appropriate temperature and light environment. If pigs are found to grow seedlings, ventilation should be used to reduce temperature, control watering, reduce humidity, or use a concentration of 2000 times the liquid Shuofeng 481 spray bed + 1000 times liquid hymexazol.
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