In the process of germination of watermelon seeds, sometimes the seed coat opens from the germinating hole (seed mouth), and even the entire seed coat spreads. After the seed coat is opened, the water immersed can easily cause paddle seeding (swollen water and fermentation of the seed kernels), rotten seed, and radicle inability to elongate. Even if the seed is temporarily not rotten, it will not be able to successfully complete the germination process and die. There are several reasons why this happens: Soaking time is too short. The seed coat of watermelon seeds is composed of four different cell tissues. The outer two layers are composed of relatively thick cuticles and cork layers, which have poor water absorption and water permeability. If the seeds are soaked in water for a short time, the water cannot penetrate into the inner layer. When the outer layer expands after absorbing water, the inner layer still does not absorb water, so that the outer layer of seed coat will produce a tension on the inner layer of seed coat. However, because the inner and outer seed coats are closely connected, and the outer seed coat is thick and the inner seed coat is thin, the inner seed coat is forced from the germination hole under the tension of the outer seed coat. "Weak link" cracked open. Germination environment humidity is too small. After the watermelon seeds are soaked, the entire seed coat will swell and swell. During germination, the water evaporates faster due to the higher temperature. If the environmental humidity is too small, the outer seed coat easily loses water and shrinks, but the inner seed coat is still in a moist and inflated state. As a result, there is a tension difference between the inner and outer seed coats. Because the inner and outer seed coats are tightly connected together, and the inner seed coats are thinner, the inner seed coats will exert a contraction force on the outer seed coats. Forced to crack under the effect of opening. Germination temperature is too high. The germination temperature of watermelon seeds should generally be maintained in the range of 25°C to 30°C. If the temperature during germination exceeds 40°C for more than 2 hours, seed coat opening will easily occur. This is because the high temperature causes the seed coat of the outer layer of watermelon to lose water and shrink, so that the same condition as the humidity at the time of germination is too small to cause the seed to split. Cleaner Products,Toilet Bowl Cleaner Liquid,Toilet Block Cleaner,Stain Remover Cleaning Wuxi Keni Daily Cosmetics Co.,Ltd , https://www.wxkenidaily.com