Watermelon seed germination avoids cracks
In the process of germination of watermelon seed, sometimes the seed coat opens from the germinating hole (seed mouth), and even the entire seed coat is opened. After the seed coat is opened, the water is immersed into the seed paddle (the seed is swollen and fermented). Rotten seed, radicle can not be elongated, etc., is the seed that will not be rotten for a moment, and it will not be able to complete the germination process without success. There are several reasons why this happens: Soaking time is too short. The seed coat of watermelon seed is composed of four different cell tissues. The outer two layers are composed of relatively thick cuticle and cork layers, which are poor in 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 kind of expansion force 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. When the humidity is too low when germinating, the whole seed coat will swell and expand after soaking. When the germination is performed, the water evaporates faster due to the higher temperature. If the humidity is too low, 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 difference in the expansion force between the inner and outer seed coats, and because the inner and outer seed coats are closely linked together, and the inner seed coats are thinner, the inner seed coats will shrink in the outer coat. Forced to crack open under force. Germination temperature is too high The germination temperature of watermelon seeds should generally be maintained in the range of 25 °C ~ 30 °C. If germination, when the temperature exceeds 40°C for more than 2 hours, the seed coat opening phenomenon easily occurs. At this time, the seeds of the watermelon are dehydrated due to the high temperature and shrink, causing the seeds to split and open due to the low humidity during germination. Alarm Burglary Safe,Office Security Burglary Safes,Burglary Safety Box,Burglary Treasury Safes Hebei Yingbo Safe Boxes Co.,Ltd , https://www.yingbosafebox.com