EFFECTS OF PLANT UREASE INHIBITOR ON CROP NUTRITION AND SOIL CHARACTERS Effects of urease and nitrification inhibitors on alleviating the oxidation and leaching of soil urea‘s hydrolyzed product ammonium Effects of urease and nitrification inhibitors on ammonia volatilization from paddy fields EFFECT OF PADDY UREASE INHIBITORS ON FATE OF 15 N UREA Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat Highest potential of subtracting nitrogen fertilizer through addition of urease inhibitor NBPT in double-cropping paddy fields Increasing nitrogen conservation by adding urease inhibitor NBPT to chicken compost manure Effect of urease inhibitor hydroquinone on urea-N transformation in soil Evaluation on environmental effect of the urease inhibitor hydroquinone Effects of NBPT urease inhibitor on ammonia volatilization in paddy fields with wheat straw application