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Anti-watermelon seedlings uncovered
When watermelon seedlings are unearthed, they are brought out of the ground together with the seed coat, causing the phenomenon that the cotyledons cannot be stretched in time. This phenomenon is called “uncovered soil†(called “caps†by melon farmers); watermelon seedlings are excavated with shells, and light affects the photosynthetic of the cotyledons. The effect of severe yellowing of the cotyledons, withering, or the formation of "tall-legged seedlings" is extremely unfavorable for the cultivation of strong seedlings. The main reasons for unearthing of watermelon seedlings with shells are as follows: 1 When the skin is thick, or when the seed germination time is too short, the seed coat does not fully absorb water and soften, and the seed shell is difficult to separate from the cotyledons; 2 the soil is too shallow after the seeding, and the seeds are covered The earth pressure does not rise with the seed coat on the cotyledon; 3 soil moisture is insufficient, affect the growth of the radicle and hypocotyl, and due to the light weight of the dry soil, not enough pressure on the seed shell shape; 4 the temperature is too low, not It is conducive to the activity of the internal enzymes of the seeds, resulting in the obstruction of the growth of the young roots and hypocotyls and affecting the seed coats. Prevention and control measures: 1 Prolong the soaking time appropriately, and it is advisable to cut open the seed center without seeing it. Generally large seeds are soaked for 10-12 hours and small seeds are soaked for 8-10 hours. 2 If a little soil is found after sowing, it can be covered with a layer of fine soil or nutrient soil. 3When the soil is dry, use a sprayer to spray the warm water through the sun, but be careful to spray thoroughly, not spray it repeatedly, or pour “masked waterâ€. 4 artificial shelling. Once uncovered seedlings are found, artificial shelling should be done in time, in the following way: in the morning or after appropriate watering, when the seed coat is wet and soft, hold the seedlings in one hand, and gently push the seed coat with one hand to make the seeds. The skin floats and the cotyledons slowly pull out.
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