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Why do you need to control the temperature? Because the roots of general vegetables can normally absorb water and fertilizer at 10~12°C, it is most suitable at about 20~25°C, and the root system has strong activity. More than 38°C of root growth stops. Relatively speaking, in a plastic crucible or glass room heated by sunlight, the temperature is generally higher and the soil temperature is lower. Therefore, we should pay attention to the side of the culture soil to make it loose and porous, and in the soil mix plant ash or rough ash, so that the soil is quite color black and black, enhance the endothermic performance, generally 2g 3 °C warmer than Huanggong. After sub-seedling, a thin film or mulch film can be placed between the rows so that the sunny day's soil temperature can be much higher than the temperature. From sowing to seedlings require higher temperatures to promote germination and emergence, then stay up all night to keep the shelf temperature of 25 ~ 30 °C as well. After the seedlings, the night temperature is reduced to below 20 °C to prevent leggy. After sub-seedling survival, the seedbed temperature should be controlled at 15~20°C. It is appropriate to cultivate dwarf seedlings. In the spring 7 days before planting, it is necessary to carry out the low-temperature hardening at natural temperature. However, attention should be paid to changes in the weather to prevent the freezing of the cold in early spring.
Do not dry wet. In winter and spring, the temperature is low, the seedbed is confined for a long time, and the high humidity can easily lead to the emergence and spread of diseases such as blight. Generally, as long as the soil quits, watering should be minimized. In the condition of ensuring the normal growth of seedlings under temperature conditions, see plastic film, glass, and water droplet condensation on the leaves, ventilation should be conducted at noon to reduce humidity and eliminate harmful gases. After seeding or seedling, the seedlings cover the membrane between the rows of seedbeds to protect the earth, reduce air humidity, and increase the effect of the ground temperature. Watering is really needed. It should be done when the weather is warmer.
In the winter, seedlings are one of the main influencing factors. Light is monitored by a temperature and humidity recorder. The winter sunshine is short and the intensity is weak. With the effect of the cover, the lighting is often insufficient, as long as the dispatch is not low. In order to meet the normal growth needs of seedlings, it is necessary to minimize the search time for festoons, quilts, and other covers. Always use glass and film to keep it light and bright. Timely seedlings are kept at a suitable density so that the lower leaves of the vegetables can receive sunlight. This is also an important measure to change the light conditions of the antelope and improve the utilization of light energy.
In the process of raising seedlings, the use of a warm and wet light recorder can accurately take measures to ensure the normal growth and development of vegetable seedlings, especially for the special requirements of some vegetables, and can take correct control measures. For example, within 40 days after the cucumber seedlings were used, the use of low temperature, short daylight treatment, the nightfall was reduced to only ~ 15 °C, keeping the sunshine up and down 8 hours, the early differentiation of the mud into the female flower, the occurrence of more than a significant effect. After the greenhouse Wall-hanging light curtains can increase the light intensity of the seedbed.
Application of Temperature and Humidity Recorder in Temperature and Humidity Control of Vegetable Seedlings
The key to nurturing strong seedlings is to have a suitable microclimate environment, especially in the winter and spring vegetable nursery management, to overcome the unfavorable climatic conditions, and to adjust the seedbed's temperature and humidity and light is the key technology for seedling raising. In this way, the health and quality of vegetable seedlings can be guaranteed and the economic benefits of vegetable cultivation can be guaranteed. When these factors are controlled by nursery, it is not enough to rely on feelings and experience alone. It is also necessary to use effective and accurate temperature and humidity recorders for timely monitoring and timely protection measures.