N2-Fixierung und Vorfruchtwirkung vom Kleegras in Abhängigkeit der Standdauer und Nutzungsart in einem Dauerfeldversuch

Summary translation

"N2-fixation and preceding crop effect of grass clover leys were examined in a long-term trial in the 13th until 15th year of duration for three crop rotations. The three- and five-year crop rotations differed in the utilization of grass clover swards (cutting and fertilizing of the subsequent crops or mulching without fertilizing) and in the growing duration of grass clover swards (two or one year; only cutting). Subsequent crops for all crop rotations were potato and winter wheat. N2-fixation measured with the total difference method showed mostly higher amounts for cutting than for mulching. These amounts were obviously underestimated, because the nitrogen yield of the succeeding crop could not be explained. Thus, the nitrogen balance of the crop rotations was always negative. Growing two-years gras clover leys resulting in higher yields of both subsequent crops. The utilization differed only in the second subsequent crop with higher yields after cutting."