Einfluss des Pflanzenwachstums und der organischen Substanz auf C- und N- Umsatz im Boden

An artificial soil was produced by open air composting of a mixture of sewage sludge, wood shavings, green compost, and a sandy loam soil, and used to investigate the effect of plant growth (wheat) and organic matter application on turnover of organic C und N. A greenhouse experiment was carried out with and without plants (wheat) to test the turnover of N in artificial soil and a mixture of artificial soil with sand in the ratio of 1:1. The results showed that the cultivation of wheat increased the net N mineralization by about 68% to 71% in comparison to treatments without plants. A laboratory experiment was carried out to investigate the effect of incubation of straw or animal manure with artificial soil at 35 °C on C mineralization and net N mineralization. The addition of straw and animal manure caused an increase in mineralization of C. The net N mineralization was higher after addition of animal manure and without substrate application (control) than after addition of straw.