2. soak beans. Pour the seed beans directly into a barrel, each barrel can soak 7.5 kilograms of seed beans, and every 5 kilograms of seed beans can soak 2 ml of rootless thickener. It is advisable to add water as soon as the seed beans are soaked, not too much or too little water (about 2 kilograms of water per kilogram of soybeans), and shake the bottom several times and stir evenly. The soaking time is 4-6 hours in summer, about 12 hours in spring and autumn, and 24 hours in winter.
3. sow. First, spread a layer of sand on the cement floor, with a thickness of about 3.3 cm, and scrape it off with a thin plastic scraper. Spread the soaked beans directly on the paved sand bed. Generally, about 2.5 kilograms of seed beans can be planted per square meter of sand bed. Spread the beans as evenly as possible, leaving no gaps or piling them on the sand surface. Too thin or too dense is not good. After sowing, cover the seeds with sand, scrape the seeds scattered around the sand bed into the bed, and then gently pour new sand on the bean surface.
4. Early management of bean sprouts. One or two days after sowing, if the temperature is around 20℃, the evaporation of water in the sand border is not great, and there is sufficient water supply when sowing, so water supply is generally not considered. During this time, try to close the doors and windows, reduce the evaporation of water, and keep the humidity in the air and sand. If the temperature is around 30℃ and the water evaporates quickly, water can be replenished as appropriate in the afternoon after sowing. When the temperature is lower than 20℃, water should be replenished on the third day after sowing.
5. Grab the sand. That is, after the sand is lifted to a certain extent, the lifted sand covering the surface of bean sprouts is grasped by hand, so that the stem petals of bean sprouts are exposed and grow.
6. Sand filling. Sand washing is to wash off the residual sand on bean sprouts with water after catching the sand, mainly to reduce the resistance of bean sprouts to grow.
7. Post-management. The suitable temperature for the growth of bean sprouts is about 15-32℃. When the temperature exceeds 30℃, it grows fastest and has a great demand for water. Spray water more than twice a day. When the temperature is 20-30℃, spray water once in the morning and once in the evening. If rootless thickener is used in seed soaking, it is unnecessary to spray rootless thickener after sand catching, water spraying and the whole growth period. But you can also use it twice after catching sand. For the first time, when the bean sprouts grow to a height of 6.6- 10 cm after sand grabbing and water spraying, 2ml rootless thickener is mixed with 3-5kg water, and the sprayable area is 5- 10 m2. When spraying, the liquid medicine should be absolutely uniform. The first spraying should not be too heavy, and the root system will stop growing. After harvesting, rootless appearance will be poor. Of course, the concentration of sprayed and mixed water depends on the temperature, weather changes and the growth of bean sprouts themselves. When the seedling height is about 10 cm, it is necessary to keep the sandy soil moist, the air humidity is moderate, and the water spray is reasonable (the water mist can be slightly larger in the later stage), so that the bean sprouts can grow healthily and rapidly, and the bean sprouts without clean shells can be basically shelled. If the humidity is not enough and the air is dry, bean sprouts will dry up and stick together all day, which will directly affect the quality of products. When the seedling height is 12 cm, it depends on the product quality.
8. put green. Putting green means letting light in, allowing watercress to carry out photosynthesis to increase chlorophyll, and gradually changing watercress from milky yellow to green.
9. Harvest. The harvesting standard of bean sprouts is about 15 cm high, the buds are neat, the stems are green, the watercress is closed with half petals or slightly open, the shell is basically shelled or loose, and the root system is white and clear, with main whiskers 1 root and few or no lateral whiskers. It can be marketed after cleaning.