Research advances on controlled-release mechanisms of nutrients in coated fertilizers Evaluation of the effect of coated urea on rape growth Study on measuring methods for pore size of polyolefin film coated controlled-release fertilizer Effects of co-situs application of polymer-coated fertilizers on grain yield, root distribution and soil residual Nmin in summer maize Evaluation of determination methods for nutrient release characteristics of coated controlled-release fertilizer under soil and water incubation conditions Evaluation of nutrients release feature of coated controlled-release fertilizer Lag period of nutrient release from polymer-coated NPK compound fertilizers