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. 2017 Nov 3:6:1950.
doi: 10.12688/f1000research.12936.2. eCollection 2017.

Unexpected results in Chernozem soil respiration while measuring the effect of a bio-fertilizer on soil microbial activity

Gabriela Bautista  1   2 , Bence Mátyás  2   3 , Isabel Carpio  2 , Richard Vilches  3 , Karina Pazmino  4   5
Affiliations

Unexpected results in Chernozem soil respiration while measuring the effect of a bio-fertilizer on soil microbial activity

Gabriela Bautista et al. F1000Res. .

Abstract

The number of studies investigating the effect of bio-fertilizers is increasing because of their importance in sustainable agriculture and environmental quality. In our experiments, we measured the effect of different fertilizers on soil respiration. In the present study, we were looking for the cause of unexpected changes in CO2 values while examining Chernozem soil samples. We concluded that CO2 oxidizing microbes or methanotrophs may be present in the soil that periodically consume CO2 . This is unusual for a sample taken from the upper layer of well-ventilated Chernozem soil with optimal moisture content.

Keywords: Chernozem; OxiTop; bio-fertilizer; soil respiration.

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Conflict of interest statement

No competing interests were disclosed.

Figures

Figure 1.
Figure 1.. Differences in CO 2 production of treated and control soil samples.
The induced method was carried out so that the difference between the results of control and the treated soil samples could become detectable sooner. Glucose was applied as inducer. As expected the CO 2 values increase or stagnate.
Figure 2.
Figure 2.. This sample shows CO 2 values periodically decreasing in all conditions.
After examining the Oxitop device’s operation, this pattern became more interesting to us, as the device quantifies CO 2 production by measuring BOD required for the degradation of organic matter. From the decreasing CO 2 values, we conclude that there was oxygen production and/or CO 2 consumption in the Oxitop bottles.
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