Langzeituntersuchungen zur C- und N-Dynamik des Bodens im Gefässversuch

Since 1982 a pot experiment with 3 different soil types and two extrem C-levels each has been carried out without nitrogen fertilization under field and greenhouse conditions. The N-uptake and changes of carbon in the soil were investigated. After 12 years the N-uptake amounts between 1030 and 2960 kg/ha. After 14 years in the average of all treatments the difference between field and greenhouse conditions was 0,36 % carbon. Under comparable experimental conditions changes depending on soil type and C-level amounts under field conditions between +0.01 and +0.02% C annualy, in greenhouse between + 0.004 and − 0.059 % C. The C/N ratio increases with a decreasing mineralisable part of carbon.