There is less ventilation in greenhouses with low temperature, and harmful gases in the shed gradually accumulate, and the odor is large. It is also easy to cause serious damage to the roots and leaves. The roots absorb nutrients, the leaves are dry and yellow, and even dead trees appear. The main source of this odor is the taste of ammonia.
Ammonia comes from manure or urea and other fertilizers with high nitrogen content. During the process of fermentation or transformation, harmful gases such as ammonia are volatilized and accumulated in the air. Many mangers used to use manure as a base fertilizer before changing rice dumplings. However, many commonly used dried chicken manure, rice manure, and fresh chicken manure are not cooked, and they can be fermented and matured slowly after being applied to the soil, which 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 low, the ground temperature is relatively high, and a large amount of ammonia may be decomposed in 3 to 4 days after top dressing. When the ammonia concentration in the greenhouse exceeds 5 mg/l, some sensitive vegetables, such as cucumbers, tomatoes, etc., will be damaged. At first, the leaves will be burned like boiling water and become brown after drying.
Farmers should improve the ratio of base fertilizer. After wintering and early spring, after the planting of vegetables, the temperature is low and the ventilation is low. The base fertilizer must be selected from high safety species and adopt the principle of “fewer and finerâ€. 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, soybean meal and other 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. When the cloudy temperature is low, you should also pay attention to short-term ventilation, so that both temperature and ventilation can be taken into consideration to avoid accumulation of harmful gases.
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