Urea is a kind of nitrogen fertilizer commonly used in agricultural production, which has the advantages of high nitrogen content, easy to dissolve in water, and easy to use. However, if urea is not used correctly, it will not only affect the growth of crops, but also cause waste and environmental pollution. Therefore, it is very important to master the correct fertilization method and precautions of urea.
First, the correct fertilization method of urea.
1.Fertilization time.
The transformation of urea in the soil takes a certain amount of time, so the fertilization time should be advanced. Fertilization is applied in the critical period of fertilizer for crop growth, such as wheat in the spring regreening stage, jointing stage and booting stage, corn in the big flare stage, etc., at this time, the crop has a large demand for nutrients, strong absorption capacity, and can give full play to the fertilizer effect of urea.
2.Amount of fertilizer.
The amount of urea fertilizer should be determined according to the type of crop, soil fertility, climatic conditions and other factors. Generally speaking, the application rate of urea is about 10-20 kg per mu, too much or too little will affect the fertilization effect. At the same time, it is also necessary to pay attention to the depth of fertilization, the general fertilization depth is about 5-10 cm, too shallow or too deep is easy to cause nutrient loss or difficult to be absorbed by crops.
3.Fertilization method.
Urea can be fertilized in a variety of ways, such as hole application, strip application, sprinkling application, etc. The specific fertilization method to use depends on factors such as crop type, soil conditions and fertilizer amount. In general, hole and strip applications can better control urea loss, while spreading applications are suitable for large areas of farmland.
4.Soil moisture.
The fertilizer efficiency of urea is related to soil moisture, and too wet or too dry will affect the fertilizer efficiency of urea. Therefore, it is necessary to pay attention to maintaining the appropriate humidity of the soil before and after fertilization, and it is generally advisable to have a soil moisture content of 60-70%.
2. Precautions.
1.Avoid mixing with alkaline fertilizers.
Urea is a neutral fertilizer, which is easy to produce chemical reactions when mixed with alkaline fertilizers, reducing the fertilizer efficiency of urea. Therefore, when using urea, it is necessary to avoid mixing with alkaline fertilizers such as lime and plant ash.
2.Avoid excessive use.
Excessive use of urea can lead to nutrient overload, which can lead to overgrowth or overgrowth, as well as problems such as soil salinity accumulation and environmental pollution. Therefore, when using urea, it is necessary to determine the appropriate amount and method of fertilization according to factors such as crop type, soil conditions and climate.
3.Pay attention to storage and transportation.
Urea is prone to moisture absorption and agglomeration, so avoid moisture and rain when storing and transporting. At the same time, urea is easy to decompose and fail at high temperatures, so special attention should be paid to sun protection and cooling when transportation and use in summer.
4.Pay attention to safe use.
Urea is non-toxic and harmless, but improper use can cause harm to the human body and the environment. When using urea, pay attention to safe use measures, such as wearing protective clothing, gloves, masks and other protective equipment; Avoid direct contact with urea** and eyes; Avoid using urea, etc., indoors and on food.