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, withering or forming tall seedlings in the cotyledons is extremely unfavorable for the cultivation of strong seedlings. The reasons for the unraveling of watermelon seedlings with shells are relatively complex. The main reasons are as follows: 1 kind of skin is thick, or the soaking time during seed germination is too short. The seed coat does not fully absorb and soften, and the seed shell is difficult to separate from the cotyledons; 2 the soil after the sowing is too shallow. The soil pressure on the seed cover does not rise with the seed coat on the cotyledon; 3 soil moisture is insufficient, affecting 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 temperature over Low, not conducive to the activity of the internal enzymes of the seeds, resulting in obstruction of the growth of the young roots and embryonic axis, affecting the seed coat out. Preventive measures: 1 Prolong the soaking time appropriately, and cut open the seed center is not suitable for dry heart. Generally, large seeds are soaked for 10 to 12 hours and small seeds are soaked for 8 to 10 hours. 2 After sowing, it was found that the soil was too little, and a layer of fine soil or nutrient soil could be covered. 3 When the soil is dry, use a sprayer to spray warm water through the sun, but be careful to spray thoroughly, not spray it repeatedly, and do not pour hooded water. 4 artificial shelling. Once the seedlings unearthed from shells are released, artificial shelling should be carried out in time, in the following way: in the morning or after proper watering, when the seed coat is wet and soft, use the left hand to hold the seedlings, and the right hand gently push the seed coat to make The seed coat floats and the cotyledons slowly pull out.
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