Urea is a high concentration, fast-acting nitrogen fertilizer containing 46% pure nitrogen. With the characteristics of high nitrogen and high efficiency, it is deeply loved by farmers. Fertilizing is a rapid growth stage in the growing period of crops, that is, a large number of growth and development stages of vegetative and reproductive growth. The crop is supplemented with a certain amount of available nitrogen or nitrogen and potassium fertilizers to meet the high yield requirements of crops. At this time, it is during the period when there is a large demand for nutrients for crops and the efficiency of root absorption is high. The nitrogen fertilizer utilization rate can reach over 50%, and the nutrients in fertilizers can be rapidly absorbed and utilized by crops that are in flowering, and can be converted into Yield. Therefore, fertilizer varieties used for top dressing must have easy
Dissolving and fast-acting characteristics, while urea is often used as the fertilizer of choice for top-dressing fertilizers, it is believed to have high nitrogen content and fast-acting characteristics.
At present, most people who directly engage in agricultural production are often not fully aware of the “quick effect†of urea. Although urea is an organic small molecule nitrogen fertilizer that dissolves quickly after it is applied to the soil, the crop cannot absorb it directly and in large amounts. Since urea is applied to the soil, it must undergo urease-involved decomposition. After the urea is converted into ammonium nitrogen, it can be quickly and massively absorbed and utilized by the crop root system. This also explains why fertilizers using ammonium sulfate, ammonium chloride, and ammonium bicarbonate are definitely faster than urea, and they can be absorbed and utilized without conversion, which is in line with the purpose and role of topdressing.
Since urea needs a conversion process to be absorbed and utilized by crops, how long does it take for conversion? What factors influence the speed of conversion? Using urea as top dressing is a few days earlier than other ammonium nitrogen fertilizers? Scientific experiments have long proved that urea conversion process is affected by various factors such as soil temperature, moisture, organic matter content, pH, etc. In general farmland, soil temperature is urea conversion when the soil moisture and pH basically adapt to the normal growth of crops. The main influencing factors of speed. For example, in the early spring when winter wheat is applied to the green season during the green season, the ground temperature is about 10°C, and the conversion of urea nitrogen to ammonium nitrogen takes about 7 to 10 days; the local temperature rises to 20°C, and the spring corn is harvested at the time of harvest, cotton budding stage. When top dressing and wheat topdressing, the conversion of urea to ammonium nitrogen takes about 5 days, but it takes only 3 days after the local temperature rises to 25°C.
As for the specific days in advance, it is necessary to adjust to local conditions. In the same season of spring and summer, it takes a few days for the soil temperature to rise slowly in the northeast, and for high soil temperatures in the south of China, the application of urea is 1-2 days ahead of schedule. For the same area, the paddy field temperature is slightly higher. Below the drylands, we must treat them differently. In addition, when urea is used as top dressing in summer, it is also necessary to pay attention to timely covering of soil or irrigation in order to prevent the burning of a large amount of ammonia. (Current Expert: Professor Cao Yiping, Senior Advisor of Sinofert China Agricultural University)
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