Soil water regimes have been shown to have important implications for the erosion risks associated with land management decisions. Despite this, there remains a paucity of information on soil moisture thresholds for farm management operations including the periodic ploughing and reseeding of improved pasture used for ruminant farming. Against this background, this study analysed sediment loss monitored on a heavily instrumented farm platform, in SW England, over four phases of ploughing and reseeding. Precipitation and sediment yields were highly variable between the ten different field scale catchments on the experimental platform after reseeds. Post-plough period rainfall ranged between 461–1121 mm and corresponding sediment yields between 0.20 - 3.13 t. ha⁻¹ yr⁻¹. The post-plough and reseeding periods accounted for a very high proportion (mean 28.8 %) of monitored sediment fluxes over the study (2012–2019) despite only covering an average of 10.9 % of the 2002 days of flume monitoring. Post-plough sediment yields were highest (2.57 t. ha⁻¹ yr⁻¹ and 3.13 t. ha⁻¹ yr⁻¹) when two catchments were ploughed in autumn months and soils were saturated. The yields for the same catchments after summer ploughing were far lower (0.72 t. ha^-1yr^-1and 0.73 t. ha^-1yr^-1). Thresholds of 35–38 % soil moisture were identified at which ploughing represented a highly elevated erosion risk. Whilst pinpointing thresholds for the clay loam soils with slowly permeable drainage in the study area, the results serve to illustrate the wider need for robust scientific data on soil moisture status to help guide the timing of farm management operations for improving production, to help reduce negative environmental consequences.

土壤水状况已被证明对与土地管理决策相关的侵蚀风险具有重要影响。尽管如此，关于农场管理操作的土壤湿度阈值的信息仍然很少，包括定期犁地和重新播种用于反刍动物养殖的改良牧场。在此背景下，本研究分析了英格兰西南部一个装备齐全的农场平台在犁耕和重新播种的四个阶段监测到的沉积物流失情况。重新播种后，实验平台上十个不同田间规模的流域之间的降水量和沉积物产量差异很大。耕后期降雨量在 461–1121 毫米之间，相应的产沙量在 0.20 - 3.13 吨之间。公顷^-1年^-1。尽管仅占 2002 年水槽监测天数的平均 10.9%，但在研究期间（2012 年至 2019 年），犁耕后和重新播种期在监测的沉积物通量中所占比例非常高（平均为 28.8%）。当秋季耕耘两个流域且土壤饱和时，耕后沉积物产量最高（2.57 t. ha ^-1 yr ^-1和 3.13 t. ha ^-1 yr ^{-1 ）。}夏耕后相同流域的产量要低得多（0.72 t. ha ^-1 yr ^-1和 0.73 t. ha ^-1 yr ^-1）。确定了土壤湿度 35-38% 的阈值，在该阈值下耕作代表侵蚀风险高度升高。虽然确定了研究区域具有缓慢渗透排水的粘壤土的阈值，但结果表明更广泛地需要有关土壤湿度状况的可靠科学数据，以帮助指导农场管理操作的时间安排，以提高产量，帮助减少负面影响环境后果。