Verlauf der Bodenreaktion und der pflanzenverfügbaren Nährstoffgehalte im 140-jährigen Ewigen Roggenbau in Halle/Saale

The topic of this article is the course of pH and the levels of plant-available macro- and micronutrients in the soil of five fertilizer variants of the Eternal Rye Trial in Halle/Saale since 1926. The pH decreased in the course of the trial in all test variants. The base saturation degree is closely related to the pH. Lime applications that were made, increased the pH temporarily or slowed down the decrease. The lowest pH was found in mineral N fertilization and the highest in PK fertilization. The plant-available P, K and Mg contents have decreased in all fertilizer variants in recent decades, with the exception of the K content after manure fertilization. With fertilization of minerals including manure, the P and K contents and the pH are increased in the subsoil. In the case of micronutrients, regular manure fertilization led to a significant increase of Mn, Fe and Si contents.