In the process of germination, watermelon seeds sometimes appear seed coat opening from the germinating hole (seed mouth), and even the entire seed coat is opened. After the seed coat is opened, the water immersed can easily cause pulp species, rotten species, and the radicle cannot be elongated. Is this why? 1. The seed soaking time is too short: The seed coat of the watermelon seed is composed of four layers of different cell tissues. The outer two layers are composed of relatively thick cuticle 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 is still unable to absorb water, so that the outer layer of seed coat will produce a kind of expansion force on the inner layer of the seed coat, so the inner layer of the seed coat will be forced by this expansion force. The "vulnerable link" of the germinating hole cracked. 2, when the germination humidity is too small: After soaking seeds of watermelon seeds, the entire seed coat will be water and swell, in the germination, due to higher temperature, water evaporation faster, if the humidity is too small, the outer layer of seed coat is very easy to lose The water shrinks but the inner seed coat is still moist and inflated. In this way, there is a difference in the expansion force between the inner and outer seed coats, because the inner and outer seed coats are closely connected. In addition, the inner seed coat is thin, so the inner seed coat will be forced to open under the effect of the outer seed coat contraction force. 3, when the germination temperature is too high: the watermelon seed germination temperature should be between 25-30 °C. If the temperature exceeds 40°C for more than 2 hours, the seed coat opening phenomenon easily occurs. This is because the high temperature causes the seed coat of the outer layer to lose water and shrink, and thus the seeds are split due to the same reason that the humidity at the germination is too small. Hespax Anti Cut Gloves,Anti Cut Safety Gloves,Anti Cut Resistant Gloves,Anti Cut Hand Gloves Jiangsu Hespax Security Co., Ltd , https://www.hespax.com