Bentonite and lignin were blended and prepared into a kind of releasing-controlling material,which was then used as coating for manufacture of coated-controlled-release fertilizer.The scanning electron photomicrographs showed that the coating was thinner,with fewer cracks and more compact intergranular deposit than the coating of mere bentonite.The soil column leaching test indicated that the cumulative N leaching rate of the urea coated with either bentonite or the complex within 50 days was much lower than that of common urea.In three coat ing treatments,it decreased by 8.61% ,14.01% and 15.22% , respectively,in comparison with CK,common urea.The total N leaching of the two treatments using complex materials as coating was 11.31% ,13.83% lower than the treatment using bentonite as coating.The pot and field trials also showed that application of urea coated with either complex could significantly increase crop yield and N recovery rate,suggesting that it is advisable to use.The mixture of bentonite and lignin as coating material,which suits the conditions of the country in developing controlled-release fertilizer.