Publication date: 15 February 2017
Source:Geoderma, Volume 288
Author(s): Ewa Ropelewska, Piotr Zapotoczny
Excess salinity may lead to degradation of arable land and exclusion from agricultural production by worsening of their properties. The evaluation of the characteristics of saline soils is very important from the point of view of the use of agricultural soil. The aim of this study was to determine changes in the physicochemical properties of soil, the content and activity of soil microbial biomass (SMB ) and the thermokinetics of glucose biodegradation in soil samples containing different doses of sodium chloride and sodium bromide (0.0263; 0.0526; 0.1052; 0.1578; 0.2104; 0.2630pH values of soil samples decreased (from 6.1 to 5.4 for NaCl and NaBr) and electrical conductivity increased (from 0.20SMB content, determined based on substrate-induced respiration (SIR), decreased with increasing doses of NaCl and NaBr (from 737RHP max ) and the apparent growth rate constant (k ), and by higher values of peak time (PT ), generation time (t G ) and the inhibitory ratio (I ). Changes in pH , SIR-SMB and Qt max (total heat production) were modeled based on the applied doses of NaCl and NaBr. The empirical data were well approximated by the proposed mathematical models representing relationships between soil pH , SIR-SMB and Qt max vs. the applied doses of NaCl and NaBr. They can be used to reliably predict the effects of the analyzed salts on the tested soil parameters.
Source:Geoderma, Volume 288
Author(s): Ewa Ropelewska, Piotr Zapotoczny