Greenhouse vegetable carbon dioxide hanging bag fertilization
The shed is airtight, and the winter season is used for heat preservation and heat storage. The ventilation coefficient is small and the time is short, which causes the lack of carbon dioxide in the greenhouse, thus affecting the photosynthesis of plants. Experiments have shown that the use of carbon dioxide gas fertilizer technology after the grass is removed from the grass, generally can increase the yield by 20% to 30%. After the discovery, as the light and action of vegetables progressed, the concentration of carbon dioxide in the greenhouse dropped sharply. At 8 to 9 in the morning, there is only 150 to 200 PPM, and if the ventilation is not timely, it will be lower. Even with ventilation, the CO2 concentration can only be added to 300 PPM, and the vegetable crop is still starved by carbon dioxide. If the vegetables are in this state for a long time, it will seriously affect their normal growth and development.
Precautions Strictly control the concentration of carbon dioxide applied. The concentration of carbon dioxide supplement should be comprehensively considered according to crop characteristics, growth period, weather conditions and cultivation techniques. Do not over- or under-low, the greenhouse needs to be sealed to reduce carbon dioxide spillover and improve fertilizer efficiency.
Reasonably arrange the period and time of application. The effects of applying carbon dioxide in vegetables, watermelons, strawberries and fruit trees at different growth stages are not exactly the same. For example, when edamame is applied with carbon dioxide during flowering and pod-forming period, the yield-increasing effect is more obvious than in the vegetative growth stage. Tomatoes, cucumbers and other fruits and vegetables from planting to flowering, plant growth is slow, carbon dioxide demand is small, generally do not apply carbon dioxide, in order to prevent plant growth. The greenhouse vegetables began to apply carbon dioxide 7 to 10 days after the planting (slow seedling period), and the greenhouse vegetables began to apply carbon dioxide 15 to 20 days after the planting (seedling period) for 30 to 35 days. It is not advisable to apply carbon dioxide before fruiting and fruiting, so as to avoid the growth of nutrients and excessive growth, and the application of carbon dioxide during the flowering and fruiting period has a significant effect on reducing the fruit drop, improving the fruit setting rate and promoting fruit growth. Fruit trees are more effective in increasing the flower bud differentiation period and fruit expansion period. The application time is determined based on the light intensity after sunrise. Generally, from November to February of each year, it is applied after 1.5 hours of sunrise; from March to mid-April, it is applied after 1 hour of sunrise; from late April to early June, it is applied after 0.5 hours of sunrise. After the application, the greenhouse or greenhouse is closed for 1.5 to 2 hours before releasing the air, usually once a day, and stopped in rainy days.
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