Urea is one of the common nitrogen fertilizers with a high nitrogen content and is suitable for a variety of crops and soils. However, incorrect fertilization methods can not only lead to poor crop growth, but can also have a negative impact on the soil and the environment. Therefore, it is very important to master the correct fertilization method of urea.
First of all, the amount of fertilizer to be applied is determined according to the crop and soil conditions. Different crops have different nutrient requirements, and the same crop has different nutrient requirements at different growth stages. Therefore, the amount of urea used depends on the crop and the stage of growth. At the same time, soil conditions can also affect the absorption and utilization of urea. For example, the fertilizer absorption capacity of sandy soil is poor, so the application rate of urea should be increased appropriately; The opposite is true for clayey soils.
Secondly, it is necessary to choose the appropriate fertilization method. Urea is easily soluble in water, so it can be fertilized by water-soluble irrigation or spreading. However, care should be taken not to overdo it when spreading, so as not to cause the crop to burn the roots or cause damage to the soil. At the same time, because urea contains biuret, it is necessary to avoid contact with ** and eyes when storing and using.
Third, pay attention to the timing of fertilization. Urea has a long fertilizer effect, but it is susceptible to decomposition and failure due to the influence of sunlight and high temperature. Therefore, fertilizer should be applied on a sunny day, and try to apply fertilizer in the morning or evening to avoid the effects of direct sunlight and high temperatures. At the same time, it is necessary to determine the timing of fertilization according to the crop growth cycle and the law of fertilizer demand, and avoid fertilization too early or too late.
Fourth, it is necessary to reasonably match other fertilizers. Urea is used as a nitrogen fertilizer, although it has a higher nitrogen content, but the content of other nutrients is low. Therefore, when fertilizing, it is necessary to reasonably match other fertilizers, such as phosphate fertilizer, potassium fertilizer, etc., according to crop needs and soil conditions. At the same time, it is also necessary to pay attention to the interaction and ratio between different fertilizers to avoid excessive fertilization or nutrient imbalance.
Finally, pay attention to safety issues. Urea contains harmful substances such as biuret, which is harmful to the human body and the environment. Therefore, it is necessary to follow the safe operating procedures and wear protective equipment such as protective clothing and gloves during the fertilization process. At the same time, the remaining urea should be stored in a cool, dry place, away from direct sunlight and humid environments. After fertilization, it is also necessary to pay attention to maintaining environmental hygiene to avoid contamination of water sources and soil.
In conclusion, mastering the correct fertilization method of urea is very important for the growth of crops and the improvement of soil. In practice, urea and other fertilizers should be reasonably applied according to factors such as crops, soil conditions, fertilization methods and timing, so as to achieve high-quality and high yield of crops and sustainable use of soil.