In order to investigate the effect of soil water

fertilizer and temperature management on the NO-3-N transport of soil in greenhouse crop production

a simulation experiment using the soil columns was inducted to determined the changes of NO-3-N transport rate and its gradients in soil vertical profiles under various vaporization temperature

initial soil moisture and NO-3-N contents for a 5 year greenhouse soil sample.The results showed that vaporization temperature and initial soil moisture had an influence effected significantly NO-3-N transport to top soils

and the transport rate increased with the increase of vaporization temperature and initial soil moisture.The effects on NO-3-N transport rat were a descending order of initial soil moisture

vaporization temperature

and their interaction.The effects of initial NO-3-N contents in soil and its interactions with vaporization temperature and initial soil moisture on NO-3-N transport rate were not significant

but it effected the absolute NO-3-N contents of soils.After water was evaporated in soil for 5days

it showed that NO-3-N content was higher in top layer soil and decreased with increase of soil depth

rose a little again and tended to a approximate steady value.A model for NO-3-N transport rate was determined under steady vaporization.This model can be used to predict NO-3-N transport rate to top soil for greenhouse under the different fertilizer and soil environment.