Tag Archives: humic substances

850–861 K. Stankevica, Z. Vincevica-Gaile and M. Klavins
Role of humic substances in agriculture and variability of their content in freshwater lake sapropel
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Role of humic substances in agriculture and variability of their content in freshwater lake sapropel

K. Stankevica*, Z. Vincevica-Gaile and M. Klavins

University of Latvia, Faculty of Geography and Earth Sciences, Department of Environmental Science, Jelgavas street 1, LV-1004, Riga
*Correspondence: karina.stankevica@lu.lv

Abstract:

The term ‘humic substances’ (HS) refers to a general category of naturally occurring, biogenic, heterogeneous organic substances. They create the most widespread natural organic matter found in sediments, soils and waters. Organic carbon in soil (up to 70%) and peat (up to 90%) usually occurs in the form of HS. HS influence the formation process of fossil fuels, as well as they are involved in the plant nutrition process, have an influence on availability and toxicity of metallic and other elements. Furthermore, HS play a significant role in the global carbon geochemical cycle. Properties and application efficiency of humus depend on the source of HS. Freshwater sapropel is a huge reservoir of HS with superior biological activity, although their total content is lower than in peat. The aim of this paper, firstly, was to present the information about the options of HS in agriculture and their main effects on plant growth. Secondly, determination and characterization of HS content in freshwater lake sapropel was performed as sapropel nowadays becomes a popular natural organic-mineral fertilizer and soil conditioner. Sapropel samples were derived from Lake Pilvelis, Lake Pilcines, Lake Vevers, Lake Liducis and Lake Padelis situated in Eastern Latvia. Investigation of HS content in sapropel is significant for the Baltic States and Northern Europe due to wide distribution and availability of sapropel in freshwater bodies. That promotes a search for new ways of extraction methods and bioeconomically effective utilization of this natural resource, obtainable in economically significant amounts, with high opportunities of its use especially in agriculture. Contemporary agriculture strongly desiderates in new products of high effectivity enhancing soil and crop productivity and quality hand in hand with sustainable development and careful attitude to the nature and surrounding environment, thus, one of the ways how it can be achieved is understanding how, where and how much HS preparations can be applied.

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499-508 M. Klavins, O. Purmalis, S. Grandovska and L. Klavina
Properties of soil and peat humic substances from Latvia
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Properties of soil and peat humic substances from Latvia

M. Klavins*, O. Purmalis, S. Grandovska and L. Klavina

University of Latvia, Department of Environmental Science, Raiņa bulv. 19, LV 1586 Riga, Latvia
*Correspondence: maris.klavins@lu.lv

Abstract:

The acidity, elemental, functional and spectral (UV, fluorescence, IR spectra) characteristics of humic substances isolated from soils of different origin and peat in Latvia are described and compared with values common for humic substances of different origin, to evaluate the character of processes during humification. Substantial dependence of properties of humic substances on the humification conditions are found.

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194–205 M.M. Marenych, V.V. Hanhur, O.I. Len, Yu.M. Hangur, I.I. Zhornyk and A.V. Kalinichenko
The efficiency of humic growth stimulators in pre-sowing seed treatment and foliar additional fertilizing of sown areas of grain and industrial crops
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The efficiency of humic growth stimulators in pre-sowing seed treatment and foliar additional fertilizing of sown areas of grain and industrial crops

M.M. Marenych¹, V.V. Hanhur², O.I. Len³, Yu.M. Hangur³, I.I. Zhornyk¹ and A.V. Kalinichenko⁴*

¹Poltava State Agrarian Academy, Faculty of Agro-Technology and Ecology, Department of Selection, Seed Growing and Genetics, 1/3 Skovorody street, UA36003 Poltava, Ukraine
²The Institute of Pig-Breeding and Agro-Industrial Production of the National Academy of Agrarian Sciences of Ukraine, 1 Shvedska mohyla street, UA36013 Poltava, Ukraine
³Poltava M.I. Vavilova State Agricultural Experimental Station of the Institute of Pig-Breeding and Agro-Industrial Production of the National Academy of Agrarian Sciences of Ukraine, 86 Shvedska mohyla street, UA36014 Poltava, Ukraine
⁴University of Opole, Faculty of Natural Sciences and Technology, Institute of Technical Sciences, Dmowskiego street 7–9, PL45–759 Opole, Poland
*Correspondence: akalinichenko@uni.opole.pl

Abstract:

The aim of the research was to establish the effectiveness of preparations, made on the basis of humic and fulvic acids on the yields of crops in case of different methods and amounts used. The experiments were held with varieties and hybrids of winter wheat, soya, corn, and sunflower. Based on the obtained results of investigation during the period of 2015–2017, the positive impact of foliar additional fertilizing with 4R Foliar Concentrate growth stimulator on the basis of humic and fulvic acids on the formation of productivity of the main crops sown areas was established.
Proceeding from the results of the research, the using of growth stimulators based on humic and fulvic acids, which contain high concentrations of these substances, can be recommended as an expedient and efficient measure of raising the productivity and improving qualitative indicators of corn, sunflower, soya, and winter wheat yields.

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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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929–947 K. Stankevica, Z. Vincevica-Gaile and M. Klavins
Freshwater sapropel (gyttja): its description, properties and opportunities of use in contemporary agriculture
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Freshwater sapropel (gyttja): its description, properties and opportunities of use in contemporary agriculture

K. Stankevica, Z. Vincevica-Gaile and M. Klavins*

University of Latvia, Faculty of Geography and Earth Sciences, Department of Environmental Science, Jelgavas street 1, LV-1004, Riga
*Correspondence: maris.klavins@lu.lv

Abstract:

 Sapropel (gyttja or dy) is a type of fine-grained and loose sediments, rich in organic matter, deposited in freshwater bodies. Properties of sapropel and quite wide possibilities of extraction makes it as an important natural resource that can be used predominantly in agriculture, horticulture, forestry, farming. Sapropel and its processing products are environmentally friendly, non-toxic, with a definite content of nutrients. The aim of the current paper was to gather the available information about the sapropel properties and its application in agriculture as soil fertilizer or soil amendment, indicating the efficiency and possible ways amounts of application. Another reason why the investigation of sapropel is important in the Baltic States and northern Europe is its wide distribution and availability in freshwater bodies that leads to find out new ways of extraction and bioeconomically-effective utilization of this highly valuable natural resource, obtainable in economically significant amounts, with high opportunities of its use in agriculture. Contemporary agriculture strongly desiderates in new products of high effectivity enhancing soil and crop productivity and quality hand in hand with sustainable development and careful attitude to the nature and surrounding environment.

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