Abstract: A controlled-release fertilizer including an inside core of water-soluble fertilizer particle and an outer layer coating material, wherein the coating material is a bentonite modified or sodium bentonite modified waterborne polymer; and a preparation method including: weighing the fertilizer core particle and the modified waterborne polymer emulsion according to the amount, preparing a semi-processed coating controlled-release fertilizer by using a coating machine, and placing the semi-processed coating controlled-release fertilizer in an oven for postprocessing to improve the compactness of the film material.

Abstract: A verification method includes obtaining a Uniform Resource Locator (URL) link from a user terminal. The URL link is generated by a portal server according to obtained user terminal information and includes the user terminal information. The method further includes obtaining the user terminal information included in the URL link and performing a validity check according to user terminal information stored on a network side and the user terminal information included in the URL link. The validity check can be performed on the URL link according to the user terminal information, which prevents different users from accessing a resource through the same correct URL link and avoids occurrence of link theft.