When the urea is equipped with a switch, urea releases a very small amount of nitrogen when the nutrient requirement is relatively low at the seedling stage of the crop, and when the crop grows vigorously, when the demand for nitrogen reaches a peak, the nitrogen in the urea is fully released, satisfying The needs of the crop. This is not a fantasy, this is the effect of "long-lasting controlled-release resin coated urea". Compared with ordinary special fertilizers, the results showed that: common special fertilizers and topdressing fertilizers were applied at a rate of 65 kg/mu, labor costs for fertilizer input and top dressing were 74 yuan/mu, 378 kg/mu, and net income was 289 yuan; The investment is 75 yuan/mu, the application is 50 kg/mu, the yield per mu is 487 kg, and the net income is 393 yuan, which is 30 percentage points higher than that of ordinary urea. The application of controlled-release fertilizers not only changed the traditional fertilization mode, but also produced base fertilizers at one time, eliminating the need for top dressing, lowering production costs, increasing production and income, and reducing the nitrate content and avoiding soil, water and air due to the uniform supply of controlled-release fertilizers. The pollution has increased the nutrient composition and food safety of the crop. It is understood that China has produced 30, 60, 90, 120, 180, 220, 300 days and other controlled release urea with different release days, and through the control technology of the membrane, it has been configured as a compound controlled-release fertilizer with nitrogen, phosphorus and potassium. . Ferrous Fumarate Food Grade,Feed Grade Ferrous Fumarate,High Quality Ferrous Fumarate,Potassium Bicarbonate Food Grade LIANYUNGANGLONGTAIWEI FOOD INGREDIENTS CO.,LTD. , https://www.longtaiweifood.com
The nitrogen in the controlled release urea is surrounded by nitrogen, and the soil moisture can slowly infiltrate through the micropores on the coating membrane. It is exchanged by the gradient difference of nutrient concentration inside and outside the envelope and transferred to the soil for absorption by the crop. When urea is used by crops, the resin coating shell can be degraded, absorb moisture when it is abundant, and store it; when the field is dry, the water in the capsule can be released, which can play a role in saving water and protecting drought.