Düngung,N-Umsatz und Pflanzenwachstum in ihrer Wirkung auf die langfristige Protonenbilanz von Böden

Influence of fertilization, nitrogen transformation and plant growth on the long-term proton balance in soils In view of results of recent publications the influence of fertilization, nitrogen transformation and plant growth on proton balance in soil is discussed. One reason, why acidity in the soil increases after plant growth can be traced back to the fact, that plants take up more N-free cations than N-free Anions from the soil. Thus the more nitrogen fertilization as well other fertilization practices will increase plant yield the more the process of soil acidification will be enhanced. There ist no influence on soil pH by forms of applied fertilizer nitrogen like NH₄NO₃, HNO₃, NH₄OH, urea or biologically fixed N. However, accompanying ions of nitrogen fertilizers depending whether they are metal cations or sulfate or chlorid anions will decrease or increase proton production. For the calculation of the amount of produced acid in the soil during the uptake of nutrients by plants the yield of the plants and the alcalinity of plant ash will be needed. The calculation of the amount of produced acid both from the fertilization and the plant growth will be falsified by the unknown amount of nitrate which is leached beneath the rooting zone.