The prevention and control of crop nutrient deficiencies can be achieved by improving the nutrient supply capacity of the soil, such as applying the corresponding elemental fertilizers and improving the ability of the crops to absorb and utilize nutrients. The application of the corresponding elemental fertilizer is a rapid and effective method for controlling crop nutrient deficiencies. In the process of fertilization, it is necessary to pay attention to different fertilizers.
First, the correction of nitrogen and nitrogen deficiency is relatively easy. The performance is that the plant is short, the leaves are narrow, the leaves are dull, and the green is light and slightly yellow. Generally, as long as the timely topdressing can be effective, for example, urea is better for foliar application. However, when applying nitrogen to the late field crops, two points should be noted: the first is to treat the pursuit with caution, and the second is to use the amount. Because the late application of nitrogen is not used properly, it can not only increase production, but often lead to production reduction, especially Especially for cereal and potato crops.
Second, the symptoms of phosphorus deficiency in phosphorus crops are not as obvious as nitrogen deficiency. Generally, they are not easy to find in the early stage. When the requirements are quick and the soil is not strong, the calcium phosphate fertilizer should be used. In the soil with strong phosphorus, calcium should be used. Magnesium phosphate fertilizer; and phosphate rock powder is generally only suitable for use as base fertilizer in acidic soil. The application of phosphate fertilizer should pay attention to the following points: 1. The application period emphasizes the application of base fertilizer, so as to focus on prevention and play the role of phosphorus in the early growth of crops; 2. Technically emphasize the application of near roots to facilitate absorption, such as using 蘸The effect of root application is better; 3. In the acid-deficient soils in the south, such as red-yellow soil and gravel-thin soil, the application of phosphate fertilizer should be more suitable for calcium-magnesium-phosphorus fertilizer and steel-slag phosphate fertilizer, which can play the role of phosphorus and neutralization soil acidification.
Third, the potassium deficiency of potassium crops should be based on soil application, generally not sprayed, the appropriate dosage is generally 5-15 kg per mu, and more potassium is required, such as potato, corn, etc., 10-15 kg per mu, other crops 5-10 kg per mu. When rice is applied, it is advocated to focus on the later stage. The reason is that potassium has a great influence on the late stage of rice, and at the same time, potassium is generally not deficient in the early stage. Potassium fertilizer should be added after the rice is allocated.
4. Trace element micro-fertilizers are generally not suitable for large-scale application due to the low demand for crops. Most of them are applied by foliar application. For some insoluble micro-fertilizers, soil application, such as boron-magnesium fertilizer, can also be used. The method, such as sulphate 0. 05 kg / mu seed dressing, the effect is very good, in addition, silicon fertilizer is a special fertilizer for rice, and other crops are used less.
First, the correction of nitrogen and nitrogen deficiency is relatively easy. The performance is that the plant is short, the leaves are narrow, the leaves are dull, and the green is light and slightly yellow. Generally, as long as the timely topdressing can be effective, for example, urea is better for foliar application. However, when applying nitrogen to the late field crops, two points should be noted: the first is to treat the pursuit with caution, and the second is to use the amount. Because the late application of nitrogen is not used properly, it can not only increase production, but often lead to production reduction, especially Especially for cereal and potato crops.
Second, the symptoms of phosphorus deficiency in phosphorus crops are not as obvious as nitrogen deficiency. Generally, they are not easy to find in the early stage. When the requirements are quick and the soil is not strong, the calcium phosphate fertilizer should be used. In the soil with strong phosphorus, calcium should be used. Magnesium phosphate fertilizer; and phosphate rock powder is generally only suitable for use as base fertilizer in acidic soil. The application of phosphate fertilizer should pay attention to the following points: 1. The application period emphasizes the application of base fertilizer, so as to focus on prevention and play the role of phosphorus in the early growth of crops; 2. Technically emphasize the application of near roots to facilitate absorption, such as using 蘸The effect of root application is better; 3. In the acid-deficient soils in the south, such as red-yellow soil and gravel-thin soil, the application of phosphate fertilizer should be more suitable for calcium-magnesium-phosphorus fertilizer and steel-slag phosphate fertilizer, which can play the role of phosphorus and neutralization soil acidification.
Third, the potassium deficiency of potassium crops should be based on soil application, generally not sprayed, the appropriate dosage is generally 5-15 kg per mu, and more potassium is required, such as potato, corn, etc., 10-15 kg per mu, other crops 5-10 kg per mu. When rice is applied, it is advocated to focus on the later stage. The reason is that potassium has a great influence on the late stage of rice, and at the same time, potassium is generally not deficient in the early stage. Potassium fertilizer should be added after the rice is allocated.
4. Trace element micro-fertilizers are generally not suitable for large-scale application due to the low demand for crops. Most of them are applied by foliar application. For some insoluble micro-fertilizers, soil application, such as boron-magnesium fertilizer, can also be used. The method, such as sulphate 0. 05 kg / mu seed dressing, the effect is very good, in addition, silicon fertilizer is a special fertilizer for rice, and other crops are used less.
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