1, shallow or table fertilizer application. Fertilizers are volatile, lose or hard to reach the roots of crops, and are not conducive to crop absorption, resulting in low fertilizer utilization. The fertilizer should be applied 16-26 cm below the side of the seed or plant.

2, excessive use of chlorine fertilizer on leaf (stem) dishes. The compound fertilizer produced with ammonium chloride and potassium chloride is called double-chlorine fertilizer, containing about 30% chlorine, easy to burn seedlings, and timely watering. Saline land and chlorine-sensitive crops cannot be applied

Use chlorine-containing fertilizer. Excessive application of potassium chloride to leaf (stem) vegetables not only causes the vegetables not to be tender and has many fibers, but also makes the vegetables taste bitter, has poor taste, and has low benefits. Urine-based compound fertilizers have high nitrogen content, biuret nitrogen is also slightly higher, and easy to burn seedlings. Pay attention to the depth of watering and fertilization.

3, fertilization method. Due to improper application methods, it may cause fertilizer damage, burning seedlings, wilting plants and so on. For example, one-time application of too much fertilizer or insufficient soil moisture after fertilization will result in excessively high concentration of soil solution and difficulty in water absorption in the crop roots, resulting in wilting and even dead plants. In addition, when there is too much ammonium nitrogen in the soil, the plants will absorb too much ammonia and cause ammonia poisoning.

4, excessive use of a nutrient element. In this way, not only will the crops be poisoned, but also the absorption of nutrients by crops will be hindered, leading to deficiency of the disease. For example, excessive application of nitrogen can cause calcium deficiency; excessive nitrate-nitrogen can cause loss of molybdenum chlorosis; 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 waste directly applied to vegetables. In the decay process of unfammified livestock and poultry manure, a large amount of harmful gases such as hydrogen sulfide are generated, easily suffocating vegetables and seeds; and generate a lot of heat, which easily causes vegetable seeds to burn or root rot, and is not conducive to vegetable seeds. Sprout growth.

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