Consultation: What are the symptoms of dead seedlings caused by fertilizer damage?
Answer: The main components of fertilizers that cause root damage are ammonium, hydrogen sulfide, sulfur oxides, nitrogen oxides, etc. The two previous hazards are the most serious. Fertilizers such as fertilizers, urea and other fertilizers contain ammonium. The content of ammonium and ammonia in alkaline soils in the north is dominated by ammonium. This is the reason why the same fertilizer in the northern soil suffers more severe damage. Hydrogen Sulphide: Sulfur-containing organic and inorganic compounds may produce hydrogen sulfide under relatively oxygen-deficient conditions in the soil. With the extension of time, ammonium can be basically converted to nitrate nitrogen. Hydrogen sulfide can be oxidized and escaped, and the hazard is greatly reduced. This conversion process is also related to temperature, high temperature conversion is fast, and low is the duration of victimization. The conversion is also related to the degree of sufficient water supply, and insufficient soil moisture will prolong the time of poisoning.
Dead seedlings caused by common fertilizer hazards are often field-wide and spotted. Dead seedlings usually start at about 15 days after fertilization (transplantation) and are extended to 40 or 50 days before they are no longer dead. Diseases, diseases that may be detected have epidemics, root rot, blight, etc., and often occur alternately. Irrigation with medication is often the more serious the irrigation (the liquid blocking the harmful diffusion of harmful gases in the soil increases the hazard).
Prevention methods: advance to 40, 50 days before planting (transplanting) and follow irrigation. When dead seedlings appear, the best way is to use wood strips, iron strips and other horizontal and vertical holes around the rhizosphere of the crop to ventilate the soil and promote the transformation of harmful substances, which can reduce the degree of damage.
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