The nitrogen in the controlled release urea is encapsulated by the membrane. The soil moisture can slowly infiltrate through the micropores on the coating membrane, exchanged by the gradient difference of the nutrient concentration inside and outside the capsule, and transferred to the soil for crop absorption, and its nitrogen The rate of release is essentially synchronized with the nutrient uptake of crop growth. When the urea is used by the crop, the resin coating shell can be degraded, absorb water when the water is sufficient, and store it; when the field is dry, the water in the capsule can be released, which plays a role of water conservation, moisture conservation and drought resistance.
The comparison test of corn controlled release special fertilizer and common special fertilizer increased by the experts showed that the common special fertilizer and top dressing were 65 kg/mu, the fertilizer input and topdressing labor cost was 74 yuan/mu, and the per mu yield was 378 kg. The net income was 289. Yuan; use a controlled release special fertilizer for a single investment of 75 yuan / mu, application of 50 kg / acre, yielding up to 487 kg per mu, net income of 393 yuan. The utilization rate of controlled release urea nitrogen can reach more than 60%, which is 30% higher than that of ordinary urea. One kilogram of controlled release urea is equivalent to about 1.5 kg of ordinary urea.
The application of controlled release fertilizer not only changes the traditional fertilization mode, but also applies the bottom fertilizer once, no need to apply fertilizer, reduce production cost and increase production and income, and because the controlled release fertilizer is evenly fed, the nitrate content is reduced, soil, water and air are avoided. The pollution has improved the nutrients and food safety of the crop. It is understood that China has produced 30, 60, 90, 120, 180, 220, 300 days of controlled release urea with different release days, and is configured into a controlled release fertilizer of nitrogen, phosphorus and potassium by membrane control technology. .
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