Abstract:

The field experiment studies the effects of Dicyandiamide on the of total-N and Nmin content in the soil of potato in each growth stage. The results showed that：After fertilizing different forms of nitrogenous fertilizer,the content of soil total-N were significantly increased than that of comparison group(P<0.05)in each growth period of potato, It makes the point that fertilizing any forms of nitrogenous can be propitious to nitrous cumulation in potato field soil. It proved that Dicyanamide may inhibit nitrogen transform into nitrate-N observably.By comparison with fertilizing ammonium-N,N-minimum numerical values of the group which fertilize nitrate-N was bigger.It means that potato has assimilated more ammonium-N or most ammonium has been lost under this condition; Because nitrate fertilize’ increase production effect is significantly and mixing dicyanamide into ammonium fertilize has not increase potato output,So N-minimum of field is more after fertilizing nitrate-N fertilize maybe cause by ammonium fertilize lost more and not by potato assimilate more ammonium-N.