Tag Archives: biological activity

xxx G. Mokrikov, T. Minnikova, K. Kazeev and S. Kolesnikov
Use of soil enzyme activity in assessing the effect of No-Till in the South of Russia
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Use of soil enzyme activity in assessing the effect of No-Till in the South of Russia

G. Mokrikov, T. Minnikova*, K. Kazeev and S. Kolesnikov

Southern Federal University, Academy of Biology and Biotechnology by D.I. Ivanovsky’s, Department of Ecology and Nature Management, av. Stachki 194/1, RU344090 Rostov on Done, Russia
*Correspondence: loko261008@yandex.ru

Abstract:

The activity of 11 enzymes (catalase, dehydrogenases, peroxydases, polyphenoloxidases, ascorbateoxidase, ferrireductase, β-fructofuranosidase, amylase, urease, phosphatase and protease) was assessed under conditions of steppe zone in the south of Russia when using different tillages. Winter wheat and sunflower are main crops in these soils. Moreover, chickpea, coriander, lint, barley, corn and some other crop are cultivated here in the crop rotation duration 6 years. Enzyme activity was compared in soils of 15 fields with long-term no-till (NT) versus to 15 fields with conventional tillage (CT). The researches were held along the whole Haplic Chernozem Loamic at a depth of 0–65 cm. Special attention was paid to top soil (0–10 cm), which is directly subject to the mechanical effect. The carbon cycle enzyme (β-fructofuranosidase) activity was the most sensitive indication for NT use. In top soil the enzyme activity was greater by 16–35% at NT versus to СТ. Activity of this enzyme reduces by 28–293% when soil depth increasing in both the tillages. Enzymes of different classes had different behaviours in soils depending on season, crops and tillage thanks to biochemical nature. Hydrolases and oxidoreductases were assessed by the indices characterizing soil condition and health. For this purpose geometric mean by hydrolase activity (GMEhd) and geometric mean by oxidoreductase (GMEox), as well as integral index of biological soil condition (IIBC) were used. Index GMEox in soil under sunflower reduced by 16% in summer versus to spring. Thereby, hydrolase index GMEhd reduced by 60%. At NT activity of oxidoreductase was lower by 10 and 13%, and activity of hydrolase was increased by 12 and 14% versus to СТ. Soil IIBS values at NT increased by 18–35% at average within three years (2016–2018). The use of NT technology contributes to an increase in the activity of hydrolases and soil quality due to the conservation of moisture in the soil.

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1142-1149 V. Obuka, M. Boroduskis, A. Ramata-Stunda, L. Klavins and M. Klavins
Sapropel processing approaches towards high added-value products
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Sapropel processing approaches towards high added-value products

V. Obuka¹, M. Boroduskis², A. Ramata-Stunda², L. Klavins¹ and M. Klavins¹*

¹University of Latvia, Department of Environmental Science, Raina Blvd. 19, LV-1586 Riga, Latvia
²University of Latvia,Faculty of Biology, Raina Blvd. 19, LV-1586 Riga, Latvia
*Correspondence: maris.klavins@lu.lv

Abstract:

Sapropel is an organic sediment from fresh water bodies that is widely distributed in the northern regions of the world. The distribution and unique properties of sapropel make it an important natural resource that can be used in agriculture, horticulture, forestry and farming directly as obtained. The aim of this study was to investigate the extraction possibilities of sapropel and potential applications of its extracts. Humic substances constitute an important ingredient of sapropel, and they can be extracted by mild alkaline extraction. Humic substances from peaty sapropel have significant differences in composition and properties, thus demonstrating the impact of precursor biological materials on the properties of humic substances formed in the humification process.

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