First, excessive use of certain nutrients. Excessive application of certain nutrients not only poisons crops, but also hinders the absorption of 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. Too much potassium will reduce the effectiveness of calcium, magnesium and boron. Too much phosphorus will reduce the effectiveness of calcium, zinc and boron.
Second, fertilization shallow or surface application. Fertilizers are volatile, lost or difficult to reach the roots of crops, which is not conducive to crop absorption, resulting in low fertilizer utilization. Fertilizer should be applied to the seed or plant 16-26 cm below the side.
Third, fresh human excrement is directly applied to vegetables. In the process of decay, the unfertilized livestock and poultry manure will produce a large amount of harmful gases such as hydrogen sulfide, which will make the vegetable seeds lack oxygen and suffocate, and generate a lot of heat. It is easy to cause vegetable seeds to burn or root rot, which is not conducive to vegetable sprouting. Growing.
4. Excessive application of chlorine fertilizer to leaf (stem) vegetables. 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 taste bitter, the taste is poor, and the benefits are low. 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.
Five, fat damage. If the fertilizer is applied improperly, it may cause fat damage, and the phenomenon of burning seedlings and plant wilting may occur. For example, excessive application of chemical fertilizers at one time or insufficient soil moisture after fertilization may result in excessive concentration of soil solution and even death of plants. In addition, when there is too much ammonium in the soil, the plant will absorb too much ammonia and cause ammonia poisoning.
Source: China Economic Net Author: Huang Yi
Improper fertilization is easy to cause fat damage
In the daily farming process, there are some unreasonable fertilization methods, which are organized as follows for reference by farmers.
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