The change of the content of water

nitrogen

phosphorus

and potassium were studied through flue-cured tobacco field experiments.Results showed: the content of water in surface layer soil was acutely affected by the outside

but the content of water in deep layer soil was mildly affected by the outside. Less rainfall

film-mulching had remarkable effect of water storage and moisture conservation;More rainfall

the effect of water storage and moisture conservation wasn't remarkable.The content of nitrogen and potassium was distinctly effected by the different duration of film-mulching.The longer duration of film-mulching last

the more nutrient moved up and riched in the top of ridge with film-mulching.But the content of phosphorus was mildly affected.In the treatment of removing in 20

30 days after transplanting

the nutrients riched in the surface layer of soil were leached in the tilth layer and absorbed by the tobacco plant.In the treatment of removing in 40 days after transplanting

the tobacco plant absorbed more nutrients in latter stage

which were not easy to come into being high quality leaves.The more fertilizer was leached in no-mulching treatment than that of other treatment.The most fertilizer riched in the top of ridge in the no-removing film treatment

the roots were ruined because of high temperature

the fertilizer were deficient in latter stage

the tobacco plants were easy to be devitalized early.