title: Changes in the soil environment from excessive application of fertilizers and manures to two contrasting intensive cropping systems on the North China Plain.
abstract: Effects of excessive fertilizer and manure applications on the soil environment were compared in greenhouse vegetable systems shifted from wheat-maize rotations 5-15years previously and in wheat-maize rotations. N, P and K surpluses to the greenhouses were 4328, 1337 and 1466kgha(-1)year(-1), respectively compared to 346, 65 and -163kgha(-1)year(-1) to wheat-maize fields. Subsequently, substantial mineral N and available P and K accumulated in the soil and leaching occurred down the soil profile in the greenhouses. Soil pH under vegetables was significantly lower than in the wheat-maize fields, while the EC was significantly higher in the vegetable soils. The mean Cd concentration in the vegetable soils was 2.8 times that in the wheat-maize rotations. Due to excessive fertilizer application in greenhouse vegetable production in northeast China, excessive salt and nitrate concentrations may accumulate and soil quality may deteriorate faster than in conventional wheat-maize rotations.
authors.affiliation: Key Laboratory of Plant-Soil Interactions, Ministry of Education; College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China. juxt@cau.edu.cn
authors.forename: X T
authors.initials: XT
authors.lastname: Ju
authors.forename: C L
authors.initials: CL
authors.lastname: Kou
authors.forename: P
authors.initials: P
authors.lastname: Christie
authors.forename: Z X
authors.initials: ZX
authors.lastname: Dou
authors.forename: F S
authors.initials: FS
authors.lastname: Zhang
mesh_terms: D000383:Agriculture; D002681:China; D004553:Electric Conductivity; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution; D005308:Fertilizers / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008372:Manure; D019216:Metals, Heavy / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D011188:Potassium / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D014131:Trace Elements / Q000032:analysis; D014908:Triticum; D014675:Vegetables; D003313:Zea mays
chemical_list: D005308:Fertilizers; D008372:Manure; D019216:Metals, Heavy; D012989:Soil Pollutants; D014131:Trace Elements; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium