Einfluss der Bodenbearbeitung zur Saat auf Ertragsbildung, N-Aufnahme und Nmin-Vorrat im Boden bei Rispenhirse (Panicum miliaceum L.) nach Winterzwischenfrucht Erbse (Pisum sativum L.)

After mulching of winter pea on 1st of May 2007 for green manuring four different varieties of millet were sown without any tillage directly into the mulch cover or after tillage by a rotary harrow on a brown earth (Cambisol) near Dresden, Germany. Due to deterioration of soil structure through the impact of rain after tillage seed emergence, plant height and grain yield of millet were reduced in tilled compared to no tilled plots. Although the content of mineral N in the soil was much higher after rotary harrowing nitrogen use efficiency of millet was significantly higher when growing without any tillage. This effect could be caused by a higher ratio of NH4-N to total mineral N in the soil which can be an advantage for plant growth with respect to the energy demand for nitrogen assimilation