Fertilizer for topdressing must have the characteristics of easy dissolution and quick-effect, and urea is often the first choice for top-dressing by farmers. They think that urea has the characteristics of high nitrogen content and quick effect. However, most farmers do not fully understand the "rapid effect" of urea. Although urea can be dissolved quickly after it is applied to soil, it must be decomposed by urease and converted into ammonium nitrogen before it can be absorbed and utilized by crops.
Scientific experiments show that the urea conversion process is affected by various factors such as soil temperature, moisture content, organic matter content, pH, etc. In general farmland, when the soil moisture and pH are basically suitable for the normal growth of crops, the soil temperature is the main urea conversion rate. Influencing factors. For example, when topdressing urea during wheat return, the ground temperature is usually around 10°C, and it takes 7 to 10 days for urea nitrogen to convert to ammonium nitrogen; topdressing urea at the spring maize stage, cotton budding stage, and wheat booting stage. When the ground temperature is generally at 20°C, the conversion of urea nitrogen to ammonium nitrogen takes about 5 days, while the local temperature rise to 25°C only takes 3 days.
As for the specific application of urea for a few days in advance, it is necessary to adapt it to local conditions. In the same season of spring and summer, in areas with slower ground temperature, it takes a few days in advance, and in areas where ground temperature rises quickly, it can take 1-2 days in advance. In the same area, the temperature of paddy fields is slightly higher. Below the drylands, we must treat them differently.
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