Soil mineral nitrogen content after 5-year continuous undersowing under cereal crop rotation - Känkänen, Hannu; Nykänen-Kurki, Päivi (Agricultural Research Department. Research Institute for Agrobiology and Soil Fertility, 1997)
Nota 53
Keywords: Ka; aluskasvi; kerääjäkasvit; typpi; viljelykierto; mineral nitrogen; nitrate nitrogen; ammonium nitrogen; N leaching; undersowing; undersown crop; intercropping; cover crop; westerwold ryegrass; white clover; spring barley; spring wheat; oats