The watermelon seeds swell with water, germinate and germinate, the seedlings unearth, the seed coat falls off, the cotyledons unfold, and the first true leaf reveals (two leaves and one heart) as the germination stage.
The germination of watermelon seeds must first absorb water, so that the seeds change from the dormant state to the germinated state. When the water absorption reaches 65% to 75% of the dry seed weight, the protoplasts of the stored substances in the seeds begin to change from gel to sol state From the polymer state such as starch, protein, fat, etc., it can be converted into simple molecules, amino acids, fatty acids and other small molecules that can be absorbed easily, providing energy for the emergence of seed buds. In this process, if the water supply is too low, it can not meet the needs of the physiological activities of the seeds, can not germinate normally, or even "sprout" phenomenon; too much water supply will make the seeds reach a supersaturated state, the permeability of the seed coat is poor, affecting the oxygen supply, Easy to cause rotten species.
Watermelon mainly consumes the nutrients stored in the seeds during the germination period, so the absolute weight (fullness) of the seeds and the storage life of the seeds have an important influence on the germination rate and the quality of the young shoots. The viability of watermelon seeds decreases with the increase of the storage period of the seeds. Although the service life of the seeds reaches 5 to 7 years, the seed germination rate is high and the germination potential is neat in 1 to 3 years.
The length of the watermelon germination period mainly depends on the ground temperature: the ground temperature is high and the germination is rapid, and the ground temperature is low and the germination is slow. The ground temperature is between 15 and 20 ° C, and the germination period takes 7 to 13 days; when the ground temperature is 25 to 30 ° C, the seedling can emerge in 3 to 4 days. In the early spring and low temperature season, when watermelon seedlings are raised, listen to and watch the weather forecast to ensure that there are 6-7 consecutive sunny days after sowing, and tighten the greenhouse film to heat up; when encountering cold weather, rain, snow, haze and other bad weather, fire roads and grounds should be used Heating equipment such as hotlines and hot air stoves increase the ground temperature to avoid affecting the emergence due to long-term low temperature and high humidity.
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