Some negative chemical properties of acid soils

Abstract

Some important chemical properties of various samples of two types of acid soil from Western Serbia (pseudogley and brown forest) are presented in this paper. Mobile Al was found in elevated and toxic quantities (10–30 mg/100 g) in the more acid samples of pseudogley soil. All samples of brown forest soil were very acid and the quantities of mobile Al were in the range from 12.8 to 90.0 mg/100 g. In a selected number of pseudogley soils, the influence of pH and other soil properties on the mineralization and nitrification processes was investigated. Strong inhibition of nitrification at low soil pH was found to be related to high quantities of mobile Al. At pH values less than 4.0 (in 1 M KCl), processes of chemical nitrification and denitrification of applied nitrites were registered in the pseudogley soils.

Istraživanja su obavljena na dva tipa zemljišta Zapadne Srbije (pseudoglej i smeđe šumsko zemljište). Oba ispitivana zemljišta karakteriše niska pH vrednost. Kod svih uzoraka smeđeg šumskog zemljišta utvrđene su toksične količine mobilnog Al za biljke i za mikroorganizme, a kod pseudoglejnog zemljišta toksične količine Al su utvrđene samo za neke uzorke. Na proces nitrifikacije, koji je praćen u odabranim uzorcima pseudogleja, direktno su delovali niska pH vrednost (kiselost) i visok sadržaj mobilnog aluminijuma. Dodavanjem NaNO2 utvrđeno je odvijanje procesa hemijske nitrifikacije i denitrfikacije u pseudoglejnom zemljištu pri pH manjem od 4,0 u 1M KCl.