The odor is big in the shed? Here are ways!

Symptom interpretation: Ammonia damage

Most of the gas hazards that occur in winter are fertilizers with high nitrogen content, such as manure or urea, which are fermented and decomposed, or ammonia, which is generated during the conversion, volatilizes and accumulates in the air, causing yellow leaves to dry up. Overwintering and picking up cucumbers, etc., are concentrated after planting in October. Early spring vegetables have been started since December. Many vegetable growers used to use manure as a base fertilizer, and common dry chicken manure, rice husk manure, and fresh chicken manure are not used. After maturity, slowly fermenting and decomposing after applying the soil may produce ammonia accumulation. When the use of manure is high, gas problems may still occur even after two months of use.

In addition, if the topdressing nitrogen content is too high, there may also be gas problems. If the humidity in the shed is small, the ground temperature is relatively high, and a large amount of ammonia may be decomposed and produced in 3 to 4 days after top dressing. Ammonia gas hazards can usually be judged by odor. Ammonia is usually accompanied by a noticeable odor and can be smelled when entering the shed. When the ammonia concentration in the greenhouse exceeds 5 mg/l, some sensitive vegetables, such as cucumbers, tomatoes, etc., will be damaged. At the beginning, the leaves will be burned like boiling water and become brown after drying.

About half a month after dressing, if more fertilizer is used at a time, especially if potassium nitrate, calcium nitrate, etc. are used too much at once, nitrite gas may also appear, and the phenomenon of gradual bleaching between veins appears. In addition, improper use of smoke agents may also cause gas problems and require attention.

Recommended program: improve the base fertilizer ratio + reasonable response to the cloudy days

Improve base fertilizer ratio

After the wintering and early spring vegetables are planted, it is during the year when the temperature is the lowest and the ventilation is least. During the use of the base fertilizer, it is necessary to select the species with high safety and adopt the principle of “fewer and finer”. Rice husk manure and dry chicken manure cannot be used in large quantities. Fresh chicken manure should be banned. It is recommended to use fermented chicken manure and soybean meal organic fertilizer instead. Topdressing should also avoid excessive use of one-time fertilizer, usually 5 to 10 kg per mu. Adjusting fertilizers is the basis for reducing the production of harmful gases such as ammonia.

Even cloudy and reasonable response

Gas damage usually occurs when the temperature is low in cloudy days and it is difficult to ventilate. At this time, attention should be paid to short-term interval ventilation to achieve both temperature and ventilation, and to ventilate as much as possible to avoid the accumulation of harmful gases.

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