Winter is part of the period of vegetable nursery. The temperature is low and often accompanied by sudden cold air attack. The seedlings have weak resistance and are prone to induce freezing injury. When the freezing injury is light, the external morphology changes little, but the physiological function declines, affecting the growth of seedlings and flower bud differentiation, which can easily cause the loss of fruit or fruit. When the freezing injury is severe, the leaves and stems appear dark green water stains, which can lead to gradual death and death. Therefore, it is very important to prevent freezing damage during the winter vegetable seedling period. The main measures are: 1. Improve the method of raising seedlings Use artificial temperature-controlled seedlings, such as the use of electric hotbed nursery, small arch shelter nursery, factory nursery and so on. 2, pay attention to warm antifreeze temperature is the main factor affecting the success of vegetable seedlings in winter. During the nursery period, attention should be paid to listening to the weather forecast. Before the temperature is lowered, measures such as covering the cover should be taken to prevent the cold and keep warm. The heating equipment can be used under certain conditions. 3. Appropriate water control and fertilizer application The winter temperature is low and evaporation is small. Watering should be properly controlled, and phosphorus and potash fertilizer should be reasonably applied to improve the cold resistance of the seedlings and prevent the seedlings from freezing. 4. Reasonable increase of lighting In the premise of maintaining the temperature of the greenhouse, grass cover and other coverings should be “early exposed and covered†as soon as possible to allow the seedlings to fully receive light and promote photosynthesis and nutrient accumulation. 5. Before hardening the seedlings within 2 weeks before the fixed value, we must control the water, gradually increase the ventilation, remove the cover and reduce the temperature of the nursery site and other measures to carry out hardening seedlings, in order to improve the resistance of seedlings to adverse environments, so that After the seedlings are planted, the seedlings are quickly regenerated and the trees are made early, which lays a good foundation for high yield, high quality and high efficiency.
With long range distance sensor with digital output, you can measure and monitor distances intergrated to your arduino, raspberry pi etc. The Laser Distance Sensor low cost is a competitive measure sensor, can measure from 3cm to 40m, 100m, max to 150m with +-1mm~+-3mm accuracy. Also, other requirements can be customized, like distance sensor analog output,long range ir sensor. We will give you full technical support when you testing our long distance sensor.
Long Range Distance Sensors,Long Range Sensor,Long Range Laser Sensor,Laser Ranging Sensor Chengdu JRT Meter Technology Co., Ltd , https://www.rangingsensor.com