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- W2935560030 abstract "Losses of nutrients, water and soil from sloping farmlands have a large potential to contribute to water eutrophication and land degradation. However, few long-term and multi-site measurements are available to assess the magnitude of effects of cross-ridge tillage on surface runoff and nitrogen (N) and phosphorus (P) losses from sloping farmlands. Field experiments were conducted under natural rainfall conditions for six to seven years across four experimental sites in southern China. Each site-year experiment consisted of three management practices: downslope ridge without fertilizer as control (CK), downslope tillage with fertilizer (DF), and cross-ridge with fertilizer (CF). Results indicated that compared to the downslope tillage practice, cross-ridge tillage reduced the average annual runoff by 6.11% to 64.2%. Compared with DF, CF significantly decreased total N (TN) and total P (TP) losses by 11.3% to 69.7% and 15.9%- to 63.5%, respectively (P < 0.05). The decreases in TN and TP losses were significantly associated with sediment yield reduced by cross-ridge, which significantly reduced both particulate N and particulate P losses. While TN loss in CF was dominated by total dissolved N (62.4%), particulate P accounted for 68.4% of TP in runoff. Across all tillage practices, N and P losses increased at higher soil N and P contents, indicating the necessity of adopting crop and nutrient management practices to reduce soil nutrient levels and thus nutrient losses from sloping farmlands. Despite regional and temporal variabilities, cross-ridge tillage consistently reduced surface runoff, sediment yield, and N and P losses compared with downslope tillage. In conclusion, cross-ridge tillage is an effective conservation measure to reduce soil erosion and nutrient losses from sloping farmland in China’s hilly regions." @default.
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- W2935560030 date "2019-08-01" @default.
- W2935560030 modified "2023-10-10" @default.
- W2935560030 title "Cross-ridge tillage decreases nitrogen and phosphorus losses from sloping farmlands in southern hilly regions of China" @default.
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- W2935560030 doi "https://doi.org/10.1016/j.still.2019.03.015" @default.
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