There are two reasons:1. There is insufficient CO2 in the greenhouse. Data show that the CO2 concentration in the greenhouse changes about one day before sunrise.For 500-600 parts per million;After sunrise, plant photosynthesis absorbs a large amount of CO2 and the CO2 concentration in the greenhouse can be reduced to less than 100PPM.
2. In winter, the edge film of the greenhouse is put down to play a role of heat preservation, thus forming a closed facility with dense CO2,At the same time, conditions are created for increasing CO2 application. The increased CO2 gas fertilizer is not easy to run away and is easy to the concentration of CO2 Control.
二.The main effect of increasing CO2 gas fertilizer
According to the increase of CO2 fertilizer on strawberry, watermelon, eggplant, cucumber, tomato, pepper, pumpkin and other crops,
There are five obvious functions:
1. Improve the photosynthetic efficiency of plants and make them grow healthily;
2. Can improve the internal and external quality of agricultural products, increase benefits;
3. Increase the yield, especially the early yield of melons and fruits;
4. Early listing time;
5. It can enhance the resistance of plants and improve the storage resistance of products.