Temperature
*Each plant has its minimum growth temperature, optimum temperature and maximum temperature.
*Only when temperature reaches its minimum growth temperature can plants begin to grow and develop.
*In the optimum temperature range, plants grow well.Plants will gradually die above the highest temperature.
*Temperature affects soil temperature, while soil temperature affects the growth and development of plant roots.
*Temperature also directly affects the plant’s metabolic strength and transpiration intensity.
Humidity
*Humidity affects transpiration, which is not only the power of water absorption, but also the power of mineral nutrition transportation.
*The humidity affects the opening and closing of plant stomata.
*Too much or too little humidity will lead to stomatal closure.
*When there is plant stomatal closure, CO2 can not enter mesophyll cells and photosynthesis slows down or even stops.
*Excessive air humidity is conducive to the reproduction of pathogens.
*The germination of spores and the development of mycelia of most fungi need higher humidity.
*Too low is beneficial to the occurrence of insect pests, such as mites,red spiders, which occurs in high temperature and low humidity.
*High humidity will cause the leaf water to coagulate, resulting in rupture of the leaf cells and make the plants weak.
Light
*Sunlight can make plants photosynthesis.
*Photosynthesis is a process when plants use light energy to assimilate CO2 and water into organic matter, store energy and emit O2.
*When the sunshine hours dropped sharply,LED growing light play an important role.
Carbon Dioxide (CO2)
*The presence of carbon dioxide is conducive to the photosynthesis of plants.
*Carbon dioxide is the raw material for photosynthesis in plants.
*Carbon is the source of carbon in organic matter.
*It is indispensable for plants to synthesize organic matter.
*95% of crop dry weight comes from photosynthesis. Only with it can plants store energy.
Ventilation
*Keeping air circulation can increase the content of carbon dioxide in the air to promote the cooperation of light.
*It can accelerate transpiration, maintain air circulation, increase photosynthesis rate and accelerate nutrient exchange rate of plants.
*The transpiration of stuffy roots can reduce the loss of most water, resulting in the difference of pressure between the upper part of
plants and the root system, thus promoting the root to absorb water from the soil and reducing the occurrence of stuffy roots.
*Reducing the incidence of pests and diseases.Keeping the environment ventilated can avoid hot and humid environment and reduce
the frequency of pests and diseases.
