1. Select bean seeds: When cultivating black bean seedlings, try to use fresh black bean seeds that are born in the same year or every other year and are fully mature. At the same time, we should strive to have full particles, bright color, and be free from mechanical damage and pests and diseases. And it should be stored in a low temperature and dry environment. Commonly used seed selection methods include screening, air selection, water selection and manual selection. \x0d\\x0d\2. Pre-germination treatment: To promote seed germination, "starting treatment" and "seed soaking treatment" are usually used. The method of starting the treatment is: before sending the pre-selected beans into the seedling container, they are generally poured into hot water at 60°C, soaked for 1 to 2 minutes, and then rinsed with cold water 1 to 2 times for the purpose of adjusting The activity of the oxidase system related to the germination of bean seeds provides temperature stimulation to dormant seeds, which helps the bean seeds germinate neatly and uniformly. The seed soaking method is: 1 kilogram of black beans requires about 1 kilogram of water. The most suitable water temperature for soaking the bean seeds is 20 to 23°C. When soaking seeds in winter, warm water is generally used. In summer, cold water can be used to soak seeds directly. The soaking time of bean seeds usually takes about 8 to 12 hours. \x0d\\x0d\3. Seedling temperature: Black bean seeds are all temperature-loving and heat-resistant vegetable crop seeds. The minimum temperature when the bean seeds germinate is 10℃, the optimum temperature is 21~27℃, and the maximum temperature is 28~30℃, should not exceed 32℃. Watering is used to adjust the temperature during sprout cultivation. For example, if the temperature is too high in summer, cold water should be generally poured on the bean sprouts, but attention should be paid to watering the sprouts in the center of the cultivation container thoroughly to keep them dry. Lower the temperature. In winter, when the temperature is low, warm water should be poured to increase the temperature of the bean sprouts being cultivated. At the same time, the circulation of cold air should be minimized. A small amount of black bean seedlings are cultivated at home, and the cultivation container can be placed next to the stove or stove to keep warm in winter. \x0d\\x0d\4. Watering to induce germination: There are generally two methods of watering when growing sprouts: one is the watering method, which requires more water each time, and at the same time, the black bean seedlings in the entire container should be spread throughout the container. When drenching, be sure to adjust the heat of each part of the bean sprouts in the entire container evenly until the temperature of the water flowing out is consistent with the temperature of the water when pouring in. The other is to use the water filling method, fill the entire container with water, and make the water surface about 2 cm higher than the surface of the bean sprouts, so that the bean sprouts in the container are generally immersed in water, and then drain or pour out all the water. Repeat watering in this way 1 to 2 times until the temperature of the seedlings in each part of the container is adjusted to the same level. \x0d\\x0d\5. Harvest at the right time: Harvesting is most suitable when the black bean seedlings grow and develop until the embryonic stem is fully elongated and the true leaves begin to appear. At this time, the embryonic stem is about 5 to 6 cm long and the roots are It is about 0.5 to 1.5 cm long. The watercress is cyan, the embryonic stem is milky white and shiny, and the first true leaves are cyan with no lateral roots.

At this time, every kilogram of black beans can produce 7 to 8 kilograms of black bean seedlings, and every kilogram of black beans can produce 4 to 5 kilograms of black bean seedlings.