Common unreasonable fertilization

(2) Double chlorine fertilizer. The compound fertilizer produced by ammonium chloride and potassium chloride is called double-chlorine fertilizer, and contains about 30% chlorine. It is easy to burn seedlings and should be watered in time. Chlorine-free fertilizers cannot be applied to saline-alkali and chlorine-sensitive crops. Excessive application of potassium chloride to leaves (stem) vegetables not only causes the vegetables to be less tender and more fibrous, but also makes the vegetables taste bitter, with poor mouthfeel and low benefits. The urea-based compound fertilizer has high nitrogen content, and the biuret has a slightly high nitrogen content. It is easy to burn the seedlings, and attention should be paid to watering and fertilization depth.

(3) Improper application of chemical fertilizers to crops. May cause fat damage, burning seedlings, plant wilting and so on. Excessive application of nitrogen fertilizer, a large amount of ammonia or ammonium ions in the soil, on the one hand ammonia volatilization, the formation of alkaline small water droplets in the air droplets, burning crops, causing scorch spots on the leaves; on the other hand, ammonium ions in the drought The soil is easily nitrified and converted into ammonium nitrite under the action of nitrosating bacteria. The gasification produces nitrogen dioxide gas, which will poison the crops, and irregular water-like plaques appear on the leaves of the crops, and the veins gradually turn white.

(4) Excessive use of certain nutrients. It not only poisons crops, but also hinders the absorption of other nutrients by crops and causes deficiency. For example, excessive nitrogen application can cause calcium deficiency; excessive nitrate nitrogen can cause chlorosis in the absence of molybdenum; excessive potassium can reduce the effectiveness of calcium, magnesium, and boron; excessive phosphorus can reduce the effectiveness of calcium, zinc, and boron.

(5) Fresh human excrement is directly applied to vegetables. Fresh human excrement contains a large number of germs, toxins and parasite eggs. If it is not directly decomposed, it will contaminate vegetables and easily spread diseases. It can be applied after high temperature stacking fermentation or harmless treatment.