Gao, J. J. ， Bai, X. L. ， Zhou, B. ， Zhou, J. B. ， Chen, Z. J.
2012-09-01 NUTRIENT CYCLING IN AGROECOSYSTEMS 2012 94(卷), 1(期), (63-72页)
Soil nutrient content and nutrient balances in newly-built solar greenhouses in the southern part of China's Loess Plateau were investigated over two consecutive years. Farmers applied manure and inorganic fertilizers at average annual rates of 1,907 kg N ha(-1), 1,601 kg P2O5 ha(-1) and 1,742 kg K2O ha(-1). Manure accounted for 65 % of the total N input, 57 % of the total P input and 55 % of the total K input. The average annual nutrient surpluses were 1,374 kg N ha(-1), 1,468 kg P2O5 ha(-1) and 881 kg K2O ha(-1). Soil organic matter, total N, available P, available K and electrical conductivity (EC) increased significantly across time in the topsoil (0-20 cm depth), but not in the subsoil (20-100 cm depth). The nitrate-N concentrations (mg N kg(-1)) of the 0-100 cm depth increased by 163-336 % over 2 years. The average accumulation of nitrate-N (kg N ha(-1)) of the 0-100 cm depth increased by 241 % and leveled out at 511 kg N ha(-1); and it was 1,015 kg N ha(-1) in the 0-200 cm depth. In conclusion, over-fertilization led to large nutrient surpluses in the soil of newly-built greenhouses.