The emergence of vegetable seedlings is not successful. Do you want to do Dr. Agricultural: Hello, my family contracted 10 mu of vegetables in greenhouses. Last year, when the seedlings were raised, there was a phenomenon of uneven growth. Is this something different? Is there any countermeasure to avoid this? Siping Li Fumin Li Fumin Hello: The farmer has a saying that “the seedlings are good and three are goodâ€. Therefore, cultivating robust seedlings is the basis for high and stable yields. However, in the actual operation process, the phenomenon of uneven seedlings often arises, which causes some troubles in management. The reasons and countermeasures for causing this phenomenon are as follows: I. Reasons 1. The seed quality is low. Seed inconsistent seed maturity, old and new seeds mixed, etc., can make the emergence of seedlings are not neat. Seedlings on seedbeds are sparsely grown due to uneven seedlings caused by seed quality. 2, improper seed processing. Seed water before seed germination insufficient, or in the germination process, moisture, temperature, oxygen and other conditions are not suitable, resulting in uneven buds, so that after emergence of seeding is not uniform. 3, seeding techniques and seedbed management techniques are poor, which is the main reason for the emergence of uneven seedlings. Uneven sowing, uneven planting bed, different thickness of soil after sowing, different seedbed environmental factors, will result in uneven emergence. The general performance is that the emergence of some areas on the seedbed is late, and other areas are normal. 4, wearing a cap unearthed. After the cap was uncovered and the seeds were germinated, the seed coat could not be left in the soil and the seedlings were topped out of the soil. Seed coat tightly attached to the cotyledon, so cotyledons can not be carried out in a timely manner, affecting the photosynthesis of seedlings, seedling growth is very unfavorable. Second, countermeasures 1, through the seed test, master the seed quality, low quality seed, such as varieties of low purity, low germination rate, severe pests and diseases seeds firmly not. The use of high quality seed that meets the national seed quality standards. 2. The germination should meet the needs of seeds for moisture, temperature, oxygen and other conditions. First of all, the seed should absorb enough water to maintain the temperature in the germination process in the 20-30, and flip every 4-5 hours once, increase oxygen, when the seed volume is large, wash seeds once every 20-24 hours with warm water, row net Mucus to facilitate gas exchange in the seed coat. When using the drug treatment, the concentration of the drug solution and the soaking time must be strictly controlled. 3, before sowing to make the seedbed pervious, generally to reach the depth of 10 cm bed soil, in order to improve the temperature of the seedbed can be poured warm water. After the water is covered, a thin layer of nutrient soil is sieved and the bed is leveled and sown. The seeding should be uniform, and immediately after sowing, a layer of sieved bed soil should be covered. The thickness of the cover soil should also be uniform, generally 3-5 times of the seed diameter. From sowing to emergence, the seedbed is required to have sufficient water, good ventilation, and high temperature. The night temperature can be 5 to 10 times lower than the daily temperature, and the water, temperature and other environmental factors should be uniform. 4. Cover the plastic film after sowing to prevent the top soil of the seedbed from being too dry. If cracks appear on the bed surface, it should be filled with moist fine soil in time, and increase the moisture and pressure of the soil surface to help the decohesion of the cotyledons.
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