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Effect of raindrop impact on nutrient losses under different near -surface soil hydraulic conditions on black soil slope Nitrogen use efficiency in stereoscopic planting rice field in North China Concentration change and migration characteristics of nitrogen in the paddy field of Ningxia Yellow River Irrigation Area STUDY ON THE ECOLOGICAL CHARACTERISTICS OF WATERLOGGING FIELD IN JIANGHAN PLAIN Effects of different fertilization on loss of organic c and n in seepage water under phyllostachy pracox stand Measurement and simulation of nitrogen leaching loss in hillslope cropland of purple soil Simulation and evaluation of groundwater seepage in contaminated sites: case study of TuoCheng County