Regulation of Plant Growth
1. Synchronous Management of Light, Temperature, Humidity and Carbon Dioxide.
Soilless cultivation and soil cultivation have different requirements for greenhouse environment. Soilless cultivation generally implements ground isolation. The indoor environment is less affected by soil, and the range of temperature, humidity, and carbon dioxide concentration changes will be relatively large. Humidity changes from high to low, and carbon dioxide concentration is insufficient, which are the biggest factors affecting the growth of soilless cultivation crops. The synchronous management of these elements is very necessary. It is necessary to equip cooling facilities, spray humidification facilities, carbon dioxide facilities, ventilation and light supplement facilities, etc., to create a suitable, sustainable and stable growth environment is an important guarantee for achieving high yield and quality of soilless crops. Temperature, humidity and carbon dioxide can be properly managed higher when the light is increased, and these indicators should be managed lower when the light is decreased.
2. High Temperature, Strong Light, Low Humidity Damage to Crops.
When the light intensity exceeds 40000 lx and the indoor temperature also exceeds 35 ℃, if the relative humidity of the air is lower than 40% at this time, the transpiration of the plant will be too vigorous, the water metabolism in the body will be out of balance, and the cucumber is prone to quality problems such as bending, waist binding, lack of luster, and crisp taste. In serious cases, the leaves of the plant will become smaller, the leaf edge will wither and yellow, affecting normal flowering and fruit. The most obvious damage they cause to tomatoes and colored peppers is the occurrence of fruit "navel rot" and weak growth. At the same time, high temperature, strong light, dry and low humidity can also easily aggravate the occurrence of vegetable virus disease and powdery mildew.
