Combining mechanical control of couch grass (Elymus repens L.) with reduced tillage in early autumn and cover crops to decrease nitrogen and phosphorus leaching

摘要: Methods for control of couch grass (Elymus repens L.) with reduced tillage and cover crops to achieve low risk nitrogen (N) phosphorus (P) leaching were investigated. Treatments post-harvest (one or two passes duckfoot cultivator), hoeing between rows in combination a crop, crop mown twice during autumn compared treatments conventional disc cultivation the without crop. The study was conducted on sandy soil Sweden measurements N P leaching. A 2-year experimental protocol used, repeated twice. implemented first year, effects (shoot density, shoot rhizome biomass) measured second year. Significant single strategies observed density but persistent not verified. In conclusion, after harvest instead mowing effectively it. Repeated cultivations resulted mean annual 26 kg ha−1 20 treatment one cultivation, 17 control, 16 12 hoeing, respectively. small (0.04–0.09 year−1), there indications increased drainage water concentrations which mown.