Rare earth urea and preparation technique

Abstract

The invention discloses a rare earth urea, and the rare earth urea contains the following ingredients, by weight: 75 to 85 parts of urea, 15 to 25 parts of calcium clay, 0.05 to 0.15 part of oxidation rare earth and a nitrification inhibitor. The system urea has a preparation process that: the urea is positioned into a wrapping machine, then the nitrification inhibitor aqueous solution is sprayed on the surfaces of urea particles in the wrapping machine rotating continuously to make the urea particles show the moisture state; the evenly mixed oxidation rare earth powders are sprinkled on the urea particles to form a rare earth wrapping layer; and the mixture is packaged after being dried. The rare earth urea provided in the invention can guarantee the nitrogen nutrition required by crops during growth, and can also release side effects brought by the long-term spreading of chemical fertilizers to a certain extent.

Description

technical field

[0001] The invention relates to urea and a preparation process thereof, in particular to an agricultural urea and a preparation process thereof. Background technique

[0002] Urea is a chemically synthesized organic amide nitrogen fertilizer, which can increase the yield of crops and is suitable for various soils and crops. In recent years, with the increase of urea application, the positive role of urea in agricultural production has become more and more obvious, and people are also reflecting on some problems that may be caused by the large and continuous use of urea. The Food and Agriculture Organization of the United Nations and the International Fertilizer Development Center have clearly pointed out that when the use of urea increases to a certain level, the continuous increase in urea use has little effect on increasing crop production. The amount of chemical fertilizer application gradually tends to be stable, while continuous large-scale use of urea,...