采用一定的方法可使尿素进入蒙脱石层间，形成蒙脱石－尿素夹层复合体,在一定范围内，随着尿素夹入量的增加，复合体的晶面间距逐渐增大,复合体被置于土壤后尿素分子从中缓慢释放,蒙脱石－尿素夹层复合作在尿素的不断释放过程中，其扩大后的晶面间距值逐渐减小并趋向于恢复到夹层作用前蒙脱石的晶面间距值. Using certain methods, urea can enter into the interlayer of montmorillonite to form montmorillonite-urea sandwich complex. Within a certain range, as the amount of urea sandwiched increases, the interplanar distance of the complex gradually increases, and the complex After being placed in the soil, the urea molecules released slowly. The montmorillonite-urea intercalation compound was used as the continuous release of urea, and its expanded interplanar distance gradually decreased and tended to recover to the role of montmorillonite Interplanar spacing value.