(1) Temperature management. 30 °C during the day before emergence and 24 °C at night are favorable for emergence. After the emergence of 25 °C, 17 °C ~ 18 °C at night is appropriate. (2) Illumination at seedling stage. Winter and spring nursery beds should be selected strong light. Summer breeding should be increased ventilation to prevent leggy, noon light is too strong to be properly shaded, to prevent roasted seedlings. (3) Seedling water management. Keep the soil moist after sowing and dip water when transplanting seedlings. After seeping the seedlings, the top soil is watered when dry. The soil moisture is maintained, and the relative humidity of the air is controlled between 60% and 70%. High Precision Distance Sensor Laser range sensors combine the advantages of a visible red sensing beam with the increased range of a laser. The optical distance sensor devices are Class 2 lasers, support Class 1 customized. The high precision autonics distance sensor is successfully be used to connect to Arduino, Raspberry Pi, with +-1mm to 3mm high accuray, and long-range solutions (max up to 150m) for your application. Precision Distance Sensor,Precision Laser Distance Sensor ,Precision Distance Sensor Laser,Accurate Laser Distance Sensor Chengdu JRT Meter Technology Co., Ltd , https://www.jrt-measure.com