Characteristics of Available Nutrients Accumulation and Eluviation in Greenhouse Soil

Studied on the available nutrient accumulation and eluviation of greenhouse soil of different years,the results showed that,compared to the farmland,nitrate nitrogen(NO3-N) content of soil in greenhouse is significantly higher and the ammonium nitrogen(NH4-N) content is slightly higher.5,10 and 14 years in greenhouse 0-100 cm horizon,respectively,the total nitrate nitrogen(NO3-N) accumulation value weighs out adjacent farmland of 4.3,5.8 and 7.1 times,in greenhouse substantial accumulation of nitrate nitrogen(NO3-N) in soil is eluviated to bottom below and loss intense.5,10 and 14 years' greenhouse soil available phosphorus(P) content of the surface is more than 200 mg/kg,respectively.5,10 and 14 years' greenhouse soil 0-100 cm the total accumulation of soil available P,respectively,outsides the farmland of 6.2,13.2 and 18.0 times.5 years young greenhouse soil available P moves to the subsurface,senior citizens over 10 years of greenhouse soil available P moves to the bottom;5,10 and 14 years' greenhouse soil available potassium(K) content of the surface is more than 300 mg/kg.The total accumulation values of K are 1.8,2.9 and 4.4 times respectively in 0-100 cm soil layer of greenhouse compared with the outside farmland.Senior citizens over 10 years of greenhouse soil available K moves to the bottom and loss intense.Available nutrient enrichment of soil in solar greenhouse is P N K,but the depth and intensity of eluviation is N K P.