Scientific and rational application of controlled release fertilizer

In recent years, with the continuous development of China's controlled-release fertilizer industrialization, controlled-release fertilizer has gradually been applied to China's field crops, and has become the first choice for farmers to fertilize in some places. The spring of the year is spring. It is now in peak season for spring plowing. How should the controlled release fertilizer as a new type of fertilizer be reasonably applied?

Controlled release fertilizers have a simple application technology and are generally used as base fertilizers. Some varieties can be used as top dressings. Seed nanny fertilizers can be used as seed fertilizers. The method of fertilization should be applied to Shihe points, or the seed nanny fertilizer should be directly used for seed dressing.

Determine the amount of controlled release fertilizer. At present, fertilizers that Jin Zhengda promotes in a large area on field crops are usually blended fertilizers containing controlled-release particles, which can generally be reduced by about 20% compared to conventional compound fertilizers. In addition, the application rate of controlled-release fertilizer should also be determined based on comprehensive consideration of the target crop yield, soil fertility and fertilizer nutrient content. If the target yield of the crop is high, that is, if it is to achieve a high or super-high yield level, it is necessary to increase the amount of controlled-release fertilizer.

Specific crop fertilization methods. Controlled-release fertilizers have a wide range of applications in agriculture. Food crops, economic and oil crops, and vegetables and fruits can all be used, but the specific application methods and application rates vary from crop to crop.

For rice, wheat and other root-dense and well-distributed crops, it can be uniformly spread on the surface at the same time before transplanting or sowing according to the recommended specific coated controlled-release fertilizer application at the surface, planted after ploughing, and can no longer be top-dressed during the growth period. .

For crops with large rows of corn, cotton, etc., according to the recommended amount of dedicated controlled-release fertilizer, one-time ditching is applied to the side of the seed and attention is paid to segregation of the seed fertilizer so as to avoid burning seeds or burning seedlings.

For peanuts and soybeans that can fix nitrogen by themselves, formulas with low nitrogen, high phosphorus, and high potassium are preferred. As a base fertilizer trench application, the application amount varies depending on the yield and the soil strength, and the general mu application amount is 20-40 kg.

For the base fertilizer of greenhouse vegetables, potassium sulfate type controlled release fertilizer is applied. Attention should be paid to reducing the application amount by 20% in order to prevent the loss of nitrogen fertilizer and increase the utilization rate. At the same time, it can reduce the impact of fertilization on the secondary salinization of soil and prevent ammonia. Gas damage to vegetable seedlings.

For potato or sweet potato used as base fertilizer, potassium sulfate controlled release fertilizer is applied, with 75-90 kg of fertilizer per acre, concentrated on the gutter.

For apples, peaches, pears, and other fruit trees, radial or annular furrows can be applied about 1 meter from the trunk, about 20 to 40 centimeters deep, near the trunk is slightly shallow, and the circumference of the canopy is deeper, and then the controlled-release fertilizer is applied. After the buried earth. In addition, the interval between fertilizers should also be determined based on the release period of controlled-release fertilizers. The amount of application, under normal circumstances, results in 0.5-1.5 kg of fruit per tree, and no fruit tree of 50 kg/mu.

Application of controlled release fertilizer precautions. Must pay attention to species (miao) fertilizer isolation, at least 8-10 cm to prevent burning, burning seedlings. As a base fertilizer application, pay attention to cover soil to prevent loss of nutrients.

Source: "Chinese agricultural" 2007 3 Author: Rui Wenli (Kim Jung-largest agricultural service center)

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