In winter, greenhouses have long closing times. Some vegetable farmers will apply a certain amount of fertilizers, such as raw chicken manure and compound fertilizers, and some nitrogen-containing fertilizers in order to promote vegetable growth and fruit enlargement. If you do not pay attention to ventilation after fertilization, sheds can easily accumulate harmful gases, which can lead to gas damage in vegetables. Therefore, in the winter when the cloudy days should pay attention to avoid the application of raw chicken manure, compound fertilizer, etc., can be applied bio-organic fertilizer to strengthen the root system maintenance. In addition, when it is necessary to top-dress the vegetables in the middle and late stages of growing, it can be done in the sunny morning, and small winds can be applied after the top dressing.
Once gas harm occurs, timely remedial measures must be taken: First, timely soil loosening and ventilation should be strengthened so that harmful gases can be emitted to the shed as soon as possible, and winds should be properly ventilated even on cloudy days. Large and noon should be released sooner or later, or at high temperatures. When it is released. The second is to spray plant growth regulators such as cytokinin and adenosine to promote the recovery of damaged crops as soon as possible. Third, try to avoid the application of unrefined chicken manure or fertilizers with high nitrogen content before closing the shed for a long time.
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