[Profit and loss of nutrients in crop-fruit ecosystems].
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.
Wu
Faqi
F
College of Resources and Environmental Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China. wufaqi@263.net
Liu
Haibin
H
Zhou
Zhengli
Z
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
D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium