Generally speaking, industrial urea is harmless to crops. Compared with agricultural urea, industrial urea has more impurities, but the requirements of nitrogen content, biuret content, water content and other indicators are not much different between them, and the relevant policies have not strictly distinguished and defined industrial urea and agricultural urea.

Is industrial urea harmful to crops?

1. In general, industrial urea is harmless to crops.

2. Compared with agricultural urea, industrial urea has less impurities and high purity, while industrial urea is for industrial use. The implementation standard only meets industrial use and generally does not purify, but there are certain requirements for iron content, alkalinity, sulfate and water insoluble matter. In addition, the requirements for nitrogen content, biuret content and water content are similar (biuret content of agricultural urea is relatively high).

Second, the difference between industrial urea and agricultural urea

1, agricultural urea

(1) excellent product: nitrogen content is above 46.4%, biuret content is not more than 0.9%, and water content is not more than 0.4%, and iron, alkalinity, sulfate and water-insoluble substances are not required.

(2) First-class products: the nitrogen content is above 46.2%, the biuret content is not more than 1%, and the moisture content is not more than 0.5%. Iron, alkalinity, sulfate and water-insoluble substances are not needed.

(3) Qualified products: the nitrogen content is above 46%, the biuret content is not more than 65438 0.5%, and the water content is not more than 65438 0%. Iron, alkalinity, sulfate and water-insoluble substances are not required.

2. Industrial urea

(1) excellent products: nitrogen content is above 46.5%, biuret content is not more than 0.5%, water content is not more than 0.3%, iron content is not more than 0.0005%, alkalinity (calculated as NH3) is not more than 0.0 1%, sulfate content is not more than 0.005%, and water insoluble matter is not more than 0.005%.

(2) First-class products: nitrogen content is above 46.3%, biuret content is not more than 0.9%, water content is not more than 0.5%, iron content is not more than 0.0005%, alkalinity (calculated as NH3) is not more than 0.0 1%, and water insoluble matter is not more than 0.0 1.

(3) Qualified products: nitrogen content is above 46.3%, biuret content is not more than 65438 0%, water content is not more than 0.7%, iron is not more than 0.0065438 0%, alkalinity (calculated as NH3) is not more than 0.03%, sulfate is not more than 0.02%, and water insoluble matter is not more than 0.04%.