title: [Profit and loss of nutrients in crop-fruit ecosystems].
abstract: The analysis on the balance of nutrient's profit and loss in crop-fruit ecosystems of three villges in middle-south Loess Plateau showed that fertilization was the main input of nutrients, of which, chemical fertilizer occupied a larger proportion, while organic manure was relatively insufficient. The quantity of N, P and K spent in interior circulation was far less than that exported from the ecosystem. The ratio of nutrient's output and input in three test villages was differed, but all at a low level.
authors.affiliation: College of Resources and Environmental Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China. wufaqi@263.net
authors.forename: Faqi
authors.initials: F
authors.lastname: Wu
authors.forename: Haibin
authors.initials: H
authors.lastname: Liu
authors.forename: Zhengli
authors.initials: Z
authors.lastname: Zhou
mesh_terms: D018556:Crops, Agricultural / Q000254:growth & development*; D017753:Ecosystem; D005308:Fertilizers; D005638:Fruit / Q000254:growth & development*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D011188:Potassium / Q000032:analysis
chemical_list: D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium