Unreasonable fertilization is usually caused by the unreasonable amount of fertilization, fertilization period, and fertilization methods. Common phenomena are:
Double chlorine fertilizer. The compound fertilizer produced by potassium chloride and ammonium chloride is called double-chlorine fertilizer, and contains about 30% chlorine. It is easy to burn seedlings and should be watered in time. Chlorine-sensitive crops cannot be used with chlorine-containing fertilizers. Excessive application of potassium chloride to leaves and stems not only causes vegetables to be stale and has more fiber, but also makes the vegetables taste bitter, with poor taste and low efficiency.
Fertilization is shallow or applied. Fertilizers are volatile, lost or difficult to reach the roots of crops, which is not conducive to the absorption of crops, resulting in low fertilizer utilization. Fertilizer should be applied to the seed or plant 16 to 26 cm below the side.
Improper application of chemical fertilizers in crops may cause fat damage, burning seedlings, plant wilting and so on. If too much fertilizer is applied once or the soil moisture is insufficient after fertilization, the concentration of the soil solution will be too high, and the roots of the crop will be difficult to absorb water, causing the plants to wilting or even die. In addition, when there is too much ammonium in the soil, the plant will absorb too much ammonia and cause ammonia poisoning.
Excessive use of certain nutrients will not only poison crops, but also hinder the absorption of other nutrients by crops and cause deficiency.
Fresh human urine fertilizer can be applied if it is not decomposed and directly applied to contaminate vegetables. It can be applied after high temperature stacking fermentation or harmless treatment.