The study was carried out by pot culture condition under field ecological environment. The amounts of urea nitrogen

nitrate nitrogen

ammonium nitrogen and available nitrogen of slow/controlled release nitrogen fertilizers were monitored at the maize seedling stage. The characteristics of nitrogen nutrition release was analyzed about those nitrogen fertilizers. The result showed that amounts of urea and ammonium nitrogen in soil by using urea coated by starch acetate film and urease inhibitor nBPT were the highest in all fertilizers

for 21.72 mg/kg and 48. 31 mg/kg. The amounts of nitrate and available nitrogen in soil using urea coated by starch acetate were the highest

for 102.90 mg/kg and 135.25 mg/kg. The urea amount of soil moving from film inside to outside in urea coated by methyl methaerylate and urease inhibitor nBPT was less

and nitrate and available nitrogen were the least

for 53.74 mg/kg and 93.70 mg/kg. The effect of reducing soil nitrate amount was most signification in fertilizers urea coated by film and urease inhibitor nBPT

and significant difference than the others. The fertilizer of urea eoated by methyl methacrylate and urea inhibitor nBPT was the best on the result about slow/controlled release function.