The growth cycle of bean seedlings is usually five to eight days, which is closely related to temperature and humidity. The growth cycle of different surrounding environments is slightly different, and some need half a month and the time is slightly longer.
Growth process of soybean seedlings
1, in the bud
The bean seedlings were in the bud 2-3 days ago, but they didn't see the light and turned yellow. After proper illumination, plants will produce chlorophyll, which will gradually turn green and the demand for water will gradually increase.
2. The new bud has grown up.
After 4-5 days, new buds will grow, but the fibers have not yet formed. At this time, the upper part can be cut off, and the seeds will continue to germinate after adding water.
How to plant bean seedlings
1, planting time
The suitable temperature for indoor cultivation is 20℃, and the suitable time for outdoor cultivation is selected according to the natural conditions in various places. The northern region can be planted all the time as long as the temperature is suitable from March, and the southern region can be planted all year round. But most of them are planted in September-165438+10 in autumn, and the temperature conditions are suitable and easy to manage.
2. Seed soaking treatment
Soak the seeds in warm water before sowing, and start sowing after swelling, which can be seedling tray or open field cultivation.
3. Planting pea seedlings on the seedling tray
Disinfect with bactericide such as Junjunqing, spray water 1-2 times a day, and change the position of seedling tray, and then carry out routine management when pea seedlings grow to 2-3 cm.
There should be some light every day, but not too strong, avoid too much cellulose, pay attention to ventilation and water spraying, and adjust the temperature to avoid rotten seedlings. Collect once every 3-5 days and once every 2-3 times.
4. Cultivate pea seedlings in the open space
Before sowing, apply 65,438+0,500 kg of decomposed farmyard manure, 65,438+000 kg of plant ash and 25 kg of calcium superphosphate, and then cultivate in a flat bed. Each mu needs seeds 13- 15 kg, cover soil 1-2 cm, and keep the soil dry and wet after emergence.
Spraying 0.3% urea solution on two real leaves, spraying 0.3% urea solution and 0.2% potassium dihydrogen phosphate after picking.
Step 5 harvest
If it is a one-time harvest, it is usually carried out when the seedling height is 8-9 cm. Usually it is harvested many times. When the seedlings grow to 15-20cm or 7-8 true leaves, pick the upper shoots.