Abstract
Goal. To study the change in redox potential (RP) in the profile of light-grey forest surface gleyed soil at different systems of fertilization and use. Methods. Field survey, physicochemical and comparative-analytical. Results. On the background of the calculated pHsalt and Clark index (rH2) the change was fixed in RP in the soil profile at long agrogenic impact. It was noted that durable plowing of the soil without fertilizers (control) for pHKCl 4,27 (average at 95% probability) led to the predominance in the profile of moderate- and low-acid mode. At entering N105P101K101 + 10 t/ha of manure + CaCO3 (1.0 Ng) on the background of changes in the reaction of the soil solution of pHKCl it was fixed sharp transition with depth of RP from intense oxidative (628 MB) to weakly recovered (363 mV) mode, and rH2 index amounted to 31,2–20,2. Conclusions. Use on acidic light-grey forest surface gleyed soil of organic-mineral fertilizer system in the dose of N105P101K101 + 10 t/ha of manure + CaCO3 (1.0 Ng) created the best conditions for the formation of intensive oxidation processes. Prolonged plowing of the soil without fertilization (control) caused the development in the profile of weakly oxidized processes. Systematic entering in the soil of some mineral fertilizers (N65P68K68) compared with the control and organic-mineral system of fertilizing contributes to a noticeable reduction of redox potential in the direction of the recovery processes. In order to study optimal doses of fertilizers and lime and to ensure balanced natural cycles of substances of acidic light-grey forest surface gleyed soils under different levels of agricultural loads, it is advisable to use RP as a highly sensitive performance indicator, which allows to quantitatively establish the deviation of the redox state of soil natural balance.
Highlights
The purpose of the research is to determine the change of redox potential in the profile of light gray forest surface-gleyed soil under agrogenic exposure
Investigation ORP changes by soil profile was carried out during the IX rotation of crop rotation during winter wheat growing in the variants: absolute control, organo-mineral fertilizer system (10 t/ha of rotation area of manure + N105 P101 K101) against the background of periodic liming with 1.0 n CaCO3 according to Ha (7.0 t/ha of limestone flour) and mineral fertilizer system alone (N65 P68 K68 )
It was found that prolonged ploughing of light gray forest surface-gleyed soil on variant without fertilization, the ORP's profile varied from mild oxidative 514 mV in arable and subsoil horizon to weak oxidative 494 mV in eluvial slightly humic (Ehgl) and 458 mV in illuvial slightly eluvial (Iegl) gleyic horizons (Table. 1)
Summary
Oxidation/reduction reactions and acid-base reactions are necessary to support all living organisms. Redox potential in soil (Eh) has received little attention in agronomy, unlike pH, which is regarded as a major indicator. Agronomists are probably depriving themselves of a key factor in crop and soil, which can be a useful integrative tool [6-7]. To obtain comparative data of the redox conditions generated by different fertilizer systems, and different acidity, in particular pHKCl, we use Clark's index (rH2) [8-9]. The purpose of the research is to determine the change of redox potential in the profile of light gray forest surface-gleyed soil under agrogenic exposure
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