The chlorine of ammonium chloride could restrain the nitrification but its influence on restraining nitrification was related to the variety of nitrogenous fertilizers and the growth of crop.

• 不种作物时 ,氯化铵中氯的硝化抑制效应稳定且与双氰胺相当 ;种玉米促进了氮素的硝化作用。