Promoting microbial immobilization of soil nitrogen during restoration of abandoned agricultural fields by organic additions

Citation

Szili-Kovacs T, Torok K, Tilston EL & Hopkins D (2007) Promoting microbial immobilization of soil nitrogen during restoration of abandoned agricultural fields by organic additions. Biology and Fertility of Soils, 43 (6), pp. 823-828. https://doi.org/10.1007/s00374-007-0182-1

Abstract
Application of organic materials to soils to enhance N immobilization into microbial biomass, thereby reducing inorganic N concentrations, was studied as a management option to accelerate the reestablishment of the native vegetation on abandoned arable fields on sandy soils the Kiskunsag National Park, Hungary. Sucrose and sawdust were used at three different topographic sites over 4 years. N availability and extractable inorganic N concentrations were significantly reduced in all sites. Soil microbial biomass C and microbial biomass N increased significantly following C additions, but the microbial C to microbial N ratio remained unaffected. It is concluded that the combined application of the rapidly utilized C source (sucrose) promoted N immobilization, whereas the addition of the slowly utilized C source (sawdust) maintained the elevated microbial biomass C and microbial biomass N in the field.

Keywords
AVAILABILITY; BIOMASS; C; FIELD; FIELDS; HUNGARY; Management; NITROGEN; RATIO; SITES; SOIL; SOILS; VEGETATION

Journal
Biology and Fertility of Soils: Volume 43, Issue 6