Microbiological parameters of soil set aside before and after desiccation
M. Nováková, K. Voříšekhttps://doi.org/10.17221/3352-PSECitation:Nováková M., Voříšek K. (2006): Microbiological parameters of soil set aside before and after desiccation. Plant Soil Environ., 52: 97-104.
Herbaceous cover of luvic chernozem (seven years set aside) with legumes, perennial grasses and their mixture was desiccated by the glyphosate herbicide Roundup Biaktiv (5 l/ha at July 2003 and 4 l/ha at June 2004). 165 soil samples were collected before (November 2002–July 2003) and after desiccation (September 2003–August 2004). Desiccation had a strong positive effect on immobilization of organic carbon from herbaceous cover and underground biomass to microbial biomass carbon (MBC) and to soil organic carbon (Corg), respectively. A significant increase after desiccation (p < 0.01) was confirmed in the parameters: Corg, MBC and in the ratio MBC/Corg. At the same time the desiccation had a retardation effect on mineralization of Corg, Norg and Sorg. A significant decrease after desiccation (p < 0.01) was confirmed in the basal and potential respiration (with nitrogen, with nitrogen and glucose), actual content of N-NH4+ without and with pre-incubation, control ammonification, and (p < 0.05) in arylsulphatase activity. The actual content of NO3– and the control nitrification increased significantly (p < 0.01) after desiccation. Plots management before desiccation included black and spontaneous fallow, mulching (one or two per year) and cutting (three times per year), plots with 4 legumes, 4 grasses and their mixtures. Mulching variants showed the best results both before and after desiccation. The soils with cutting treatment ranked 8th–10th out of 11 studied combinations.Keywords:
land set aside; fallow; desiccation; Roundup Biaktiv; microbial biomass; K2SO4 extractable carbon; biological activity; respiration; nitrification; ammonification; arylsulphatase