Self-regulation and management of fertility restoration of typical chernozem in agroecosystems

2016 ◽  
Vol 3 (2) ◽  
pp. 63-78
Author(s):  
O. Demydenko ◽  
V. Velichko
Keyword(s):  
Environmental Changes ◽  
Self Regulation ◽  
Soil Formation ◽  
Self Organization ◽  
Natural Soil ◽  
Forest Steppe ◽  
Porous Space ◽  
Left Bank ◽  
Typical Chernozem ◽  
The Impact

Aim. To investigate the process of enhancing the self-organization and self-regulation of chernozem towards natural organization under the impact of long-term soil-protective surface tillage and to determine its impact on enhancing the ability of chernozem to adapt to environmental changes, preserving agroecological stability of the agroecosystem of the Left-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory, computational, mathematical and statistical. Results. The complex years-long studies (1992–2015) demonstrated that the com- bination of soil-protective technologies of cultivating crops in the agroecosystems is a factor of affecting the character, orientation and self-regulation of energy- and mass exchange in a complicated network of interac- tions and interrelations of chernozems in agroecosystems. The determinant and governing impact in restoring the fertility of typical chernozem in the Left-Bank Forest-Steppe of Ukraine is soil-protective technologies of cultivating agricultural crops, based on surface tillage. The energy-wise appropriateness of creating the porous space of chernozem in conditions of soil-protective treatment should be deemed as thermodynamic code of soil formation or the process of implementing the “memory” about the morphogenicity of spatial soil form of chernozem of a high self-organization degree, which is in direct correlation with the process of enhancing the residual features of natural soil formation and accumulative orientation of fertility indices. Conclusions. The soil-protective system of agriculture should be viewed as a complex of methods and technologies of systemic or ecologically reasonable use of anthropogenic and natural energy resources. It creates the background to solve the main problem of agriculture – rational use of chernozem fertility with simultaneous extensive resto- ration, which ensures more complete use of the bioclimatic potential with optimal exploitation of natural and anthropogenic resources of the Left-Bank Forest-Steppe territory.

Microagrogenesis of chernozem in agrocenosis

2017 ◽  
Vol 4 (1) ◽  
pp. 28-45
Author(s):  
O. Demydenko ◽  
V. Velichko
Keyword(s):  
Humic Substances ◽  
Soil Formation ◽  
Mineral Fertilizers ◽  
Forest Steppe ◽  
Left Bank ◽  
Hydrothermal Conditions ◽  
Typical Chernozem ◽  
Theoretical Substantiation ◽  
Organic Mineral ◽  
Mineral System

The aim of the study was to provide scientifi c and theoretical substantiation for the process of microaggrega- tion of typical chernozem via the simulation of natural processes of soil formation under the effect of systemat- ic application of soil-protecting technologies of crop cultivation with surface packing of root and after-harvest remains, humus, and mineral fertilizers in agrocenoses of the Left-Bank Forest-Steppe of Ukraine. Methods. Laboratory-analytical, experimental fi eld, statistical. Results. During tillage (for over 75 years) the number of free and friable-linked aggregates in the 0–40-cm chernozem layer decreased down to 17–20 %, and on the background of organic-mineral system of fertilization (15 t/ha of humus + N 80 P 75 K 60 ) there was an increase in the content of the mentioned groups of microaggregates up to 20–25 %. The systematic implementation of soil protective technologies promoted the increase in the content of free and friable-linked microaggregates up to 29–32 %. During tillage, the coeffi cient of saturation with humus for physical clay (PC) decreased 1.3–1.4 times compared to the grassland. The value of PC saturation during the soil protective tillage was optimal, as humus was neither accumulated in the form of free humates, nor stored like “fat” in animal organisms.aAnd there was no blocking of nutrients with free humates. Humus acts as a connective tissue, promoting the improved water-resistance of chernozem structure on the micro- and macroaggregate levels. The ability of chernozems to have aggregation was determined by the dispersion factor (DF), which was 12–14 % during tillage without introducing any fertilizers, and 10 % – with the introduction of fertilizers, which testifi ed to a weak degree of microaggregation. With minimal tillage on the background of the organo-mineral system of fertilization, DF = = 6–7 %, and by the end of rotation it decreased down to 3-5 %. Conclusions. Enhanced microaggregation in soil protective technologies is explained by the fact that detritus and newly formed humic substances enhance their role in the formation of organo-mineral complexes in case of optimization of hydrothermal conditions in the seasonal cycle and decreased tempo of humus mineralization. The correlation coeffi cient between the num- ber of microaggregates, sized 0.01–0.25 mm and the content of peptized humic substances during tillage was as follows: R = +0.480.01, and for soil protective technologies it was: R = (+0.70–0.75) 0.01. The increase in microaggregation in conditions of soil protective tillage occurred in the direction of wild land analogs and fallow, which testifi ed to the simulation of the natural process of typical chernozem microaggregation in the agrocenoses of the Left-Bank Forest-Steppe of Ukraine.

scholarly journals Bioproductive сapacity of typical chernozem in the Left-Bank Forest-Steppe of Ukraine under favorable humid conditions

2021 ◽  
pp. 87-100
Author(s):  
Yu. O. Tararico ◽  
R. V. Saidak ◽  
R. V. Olepir ◽  
Yu. V. Soroka ◽  
S. V. Vitvitskiy
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
Yield Potential ◽  
Forest Steppe ◽  
Left Bank ◽  
Main Field ◽  
Typical Chernozem ◽  
Field Crops ◽  
The Impact

The article presents the results of research on the assessment of modern climate change and the impact of weather conditions on the yield of main field crops when using different feeding systems and tillage. It was established that during 1991-2020 the average annual air temperature in the region increased by 1,1oC, and the annual precipitation decreased by 5%. Under such conditions, the frequency of recurrence of highly and moderately arid conditions of the growing season increased from 47% in 1961-1990 to 61% in 1991-2020, however the probability of forming a sufficient  moisture supply decreased by half. Based on the results of the Climate Water Balance (CWB) assessment, it was specified that in the western part of the Left-Bank Forest-Steppe, according to average long-term data a negative WBC has been formed since June, and by the end of August its deficit reaches over 140 mm or 1,400 m3 / ha. In general, by the end of the period for 1991-2020, the deficit of WBC increased by 82 mm. Based on the information database made on the results of long-term stationary field experiment at Poltava Research Station of the Institute of Pig Farming and Agroindustrial Production of NAAS, the yield potential of main crops and the productivity of typical chernozem subject to the optimization of crop rotation and nutrient and water-air regimes, were evaluated. It was determined that optimization of crop rotations increases plant productivity by 19%, fertilizer systems - by 19-36%, irrigation - by 94%, irrigation and fertilization - by 130-153%, and a comprehensive combination of all agronomic measures - by 200% and more. It was also established that the total productivity of crop rotation under different systems of basic tillage remains virtually unchanged and enables to obtain average by year 3.6-3.8 t kd / ha against the background of natural soil fertility. From the organic fertilizer systems, the efficiency of using crop by-products as fertilizers is 10% higher than using manure and practically does not concede to organomineral fertilizer systems. As a result of research it was found that in the region in recent decades there is a tendency of deteriorating growing conditions of main field crops, which is reflected in the formation of low yields and poorer crop rotation productivity, significant variation of these factors in terms of weather, especially when having high soil fertility.

Regulation of nitrogen-carbon interactions in agroecosystems in the forest-steppe zone of Ukraine

2015 ◽  
Vol 2 (1) ◽  
pp. 35-49 ◽  
Author(s):  
V. Velichko ◽  
О. Demidenko
Keyword(s):  
Crop Production ◽  
Steppe Zone ◽  
Complex Model ◽  
Organic Fertilizers ◽  
Natural Soil ◽  
Forest Steppe ◽  
Atmospheric Layer ◽  
Secondary Products ◽  
Different Types ◽  
The Impact

Aim. To determine the specifi ed parameters of the complex model of nitrogen-carbon circulation while using different types of crop rotation, kinds of organic fertilizers and ways of soil cultivation in agroecosystems of the forest-steppe zone of Ukraine. Methods. Field, laboratory, computational, mathematical and statistical. Results. Specifi c types of organic fertilizers affect the emission of СО 2 into the lowest atmospheric layer: in case of humus the typical emission interval is 25–85 t/ha, while in case of secondary products it is 70–160 t/ ha. The impact of the way of chernozem preparation on nitrogen-carbon circulation is manifested in the fact that in case of subsurface tillage the carbon balance in soil was positively increasing compared to ploughing. The interval of СО 2 emission into the lowest atmospheric layer due to the mineralization of humus and organic fertilizers with ploughing changes in a wider range compared against subsurface tillage. Conclusions. The nitrogen-carbon interactions are impaired due to the introduction of humus and removal of secondary products beyond the boundaries of the agroecosystem in the course of ploughing. The application of ground secon- dary products of crop production as organic fertilizers, wrapped up into the surface layer of chernozem during the subsurface tillage of soil, simulates the natural course of nitrogen-carbon circulation in agroecosystems of different types. Natural soil formation process is simulated due to the activation of photosynthetic activity of cultivated crops with СО 2 saturation in the lowest atmospheric layer, which provides for extensive restoration of chernozem fertility in the forest-steppe zone of Ukraine.

scholarly journals Evolution of chornozems of agrogenetic and postagrogenetic using of left bank forest-steppe of Ukraine

2013 ◽  
pp. 356-363
Author(s):  
Dmytro Tikhonenko ◽  
Kostiantyn Novosad ◽  
Dmytro Gavva
Keyword(s):  
Cation Exchange ◽  
Key Words ◽  
Soil Formation ◽  
Forest Vegetation ◽  
Forest Steppe ◽  
Left Bank ◽  
Soil Processes ◽  
Complex Field ◽  
Field Laboratory

The results of the complex field, laboratory and expeditionary researches of physicochemical (cation-exchange), chemical, acid-alkaline, microbiological, micromorphological properties and dynamics of “effervescence line” in chornozem soils of the postagrogenetic and agrogenetic use, were presented in the thesis. It has been proven that the influence of forest vegetation on the agronomical characteristics of typical chornozems is almost identical to the action of grass fitocenosis. Theoretical generalizations and theory of the soil formation evolution under grass, artificial forest fitocenosis and in agrocenosis were proposed. Key words: chornozem, evolution, postagrogenesis and agrogenesis, soils, elementary soil processes, fitocenosis, “agrochornozems”, black “forestchornozems”.

Decadal high-resolution multi-proxy analysis to reconstruct natural and human-induced environmental changes over the last 1350 cal. yr BP in the Altai Tavan Bogd National Park, western Mongolia

The Holocene ◽  
2020 ◽  
Vol 30 (7) ◽  
pp. 1016-1028 ◽  
Author(s):  
Julia Unkelbach ◽  
Kaoru Kashima ◽  
Gaadan Punsalpaamuu ◽  
Lyudmila Shumilovskikh ◽  
Hermann Behling
Keyword(s):  
High Resolution ◽  
Water Availability ◽  
National Park ◽  
Environmental Changes ◽  
Anthropogenic Impacts ◽  
Climatic Conditions ◽  
Forest Steppe ◽  
Permafrost Degradation ◽  
Rainfall Events ◽  
The Impact

The ‘Altai Tavan Bogd’ National Park in the north-western part of the Mongolian Altai, Central Asia, is located in a forest-steppe ecosystem. It occurs under the influence of extreme continental and montane climate and is sensitive to natural and anthropogenic impacts. High-resolution (<20 years per sample) multi-proxy data of pollen, non-pollen palynomorphs (NPPs), macro-charcoal, diatoms, and XRF scanning from radiocarbon-dated lacustrine sediments reveal various environmental changes and the impact of different settlement periods for the late-Holocene. From 1350 to 820 cal. yr BP (AD 600–1130), the distribution of grass steppe indicates a climate similar to present-day conditions. Rapid improvements of climatic conditions (e.g. increased rainfall events) possibly favored a recovery of forest-steppe encouraging nomadic movements into alpine areas. In the period from 820 to 400 cal. yr BP (AD 1130–1550), the decline of forested areas suggests an increasingly drier and possibly colder climate. Some political shifts during the Mongol Empire (744–582 cal. yr BP; AD 1206–1368) favored variations in nomadic grazing habits. After 400 cal. yr BP (AD 1550), moisture and temperature increased slightly, and from ca. 40 cal. yr BP (AD 1910) to present, annual temperature continued to increase more markedly favoring an additional water availability due to permafrost degradation. Diatom data suggest several intervals of increased water availability in all periods which might have caused erosion due to heavier rainfall events or increased snow melt. Immediately after most of these high-water intervals, NPP data reveal periods of increased grazing activities in the area.

scholarly journals INFLUENCE OF DIFFERENT SYSTEMS OF CROP FARMING ON ECOLOGICAL AND TROPHIC GROUPINGS OF MICROORGANISMS OF TYPICAL CHORNOZEM IN THE CONDITIONS OF THE LEFT-BANK FOREST STEPPE OF UKRAINE

2021 ◽  
Vol 33 ◽  
pp. 62-71
Author(s):  
Rieznik S. V.
Keyword(s):  
Farming System ◽  
Forest Steppe ◽  
Left Bank ◽  
Trophic Groups ◽  
Microbiological Activity ◽  
Microscopic Fungi ◽  
Typical Chernozem ◽  
Organic System ◽  
Crop Farming ◽  
Intensive System

Objective. To establish the influence of different crop farming systems on the parameters of the number of representatives of ecological and trophic groups of microorganisms in typical chernozem. Methods. Comparative-profile-genetic, microbiological, statistical. Results. The upper 0–10- centimetre layer of soil (the number of microorganisms decreases with depth and the predominance of microbiological activity in the 10–20-centimetre layer is possible only in dry periods) is characterised by the highest microbiological activity. The microbiocenosis undergoes the greatest transformations in the conditions of intensive system of crop farming upon mixing and turn of a layer. This is expressed in a significant decrease in microbiological activity in the 0–10-centimetre layer and vice versa — an increase in the layers of 10–20 and 20–30 cm. Agrogenic soils have higher parameters of total microbiological activity compared to the fallow area. The most positive influence on biogenesity was reported in the variants of the organic system of crop farming, especially with the use of green manures. The data on the directions of development of soil biological processes of the studied variants by the analysis of oligotrophic coefficients, mineralization-immobilization and mobilization of nitrogen stock are provided. Mathematical analysis of the data showed a significant influence of the depth of sampling on the number of all studied microorganisms, while the crop farming system significantly affected the number of microscopic fungi, actinomycetes and amylolytic microbiota. Conclusion. Agrogenic use of chernozems reduces the number of microscopic fungi. In the variants of organic crop farming, a significant increase in the number of actinomycetes and amylolytic microbiota was reported. Under the intensive system of crop farming, there is a decreased number of representatives of all studied ecological and trophic groups of microorganisms. And vice verse, variants of the organic crop farming system, especially under the use of green manure, have a higher number of most functional groups of microorganisms. Cultivated soils are characterized by a higher coefficient of mineralization and immobilization compared to fallow.

scholarly journals Long-term dynamics of humus content under different technologies of soil tillage

2018 ◽  
Vol 5 (1) ◽  
pp. 3-16
Author(s):  
O. Demydenko ◽  
P. Boyko ◽  
V. Velychko
Keyword(s):  
Humus Content ◽  
Soil Tillage ◽  
Forest Steppe ◽  
Left Bank ◽  
Typical Chernozem ◽  
Actual Measurement ◽  
Initial Content ◽  
Simultaneous Decrease ◽  
Humus Accumulation

The continuous agronomic experiment revealed long-term dynamics of the total humus content and presented a forecast of the change in humus content in typical low humus chernozem under different technologies of till- age till 2050. Aim. To determine the rates of humus accumulation dynamics and mineralization of total humus and to develop the forecast of the change in its content within a continuous agronomic experiment under long- standing application of different technologies of soil tillage to typical low humus chernozem of the Left-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory-analytical, mathematical and statistical. Results. The application of different technologies of tillage to typical low humus chernozem for 42 years resulted only in the delay in dehumifi cation processes and some stabilization of humus mineralization, but it did not promote its preservation and extended restoration to the initial level as of the start of the experiment. The increase in the total humus content for simple and extended restoration of humus in the centennial cycle equaled 20–25 t and 30–33 t per 1 ha respectively. To ensure the increase in content and reserves of humus for 42 years, it is necessary to introduce 10–12 t of humus per 1 ha for simple restoration of total humus content and 14–15 t per 1 ha – for extended restoration annually. Conclusions. Simple restoration of humus in typical chernozem may be stated after achieving its actual (2017) content of at least 90 % from the content as of the beginning of the centennial cycle (92 years), which ensures maximal approximation to the non-decreasing cycle of humus dynamics trends in the centennial cycle. If the humus content is ensured in the actual measurement for the level, exceeding 90 % from the initial content, and dynamics trends are growing, one may state the success of achieving the state of extended restoration of humus. The obtained state of simple and extended accumulation of humus is ensured by the positivity of the trends of humus increase during the continuous experiment (42 years) with simultaneous decrease in dehumifi cation process in the centennial cycle (92 years) which is impos- sible to neutralize completely.

scholarly journals Influence of fertilization with green manure and treatment on yield, economic and energy efficiency of spring barley

2021 ◽  
Vol 12 (2) ◽  
pp. 60-68
Author(s):  
K.S. Karabach ◽  
◽  
E.M. Berezhniak ◽  
Keyword(s):  
Energy Efficiency ◽  
Protein Content ◽  
Green Manure ◽  
Spring Barley ◽  
Fertilizer Application ◽  
Mineral Fertilizers ◽  
Forest Steppe ◽  
Typical Chernozem ◽  
Tillage Systems ◽  
The Impact

The influence of the application of fertilizers with green manure and soil treatment on the yield, economic and energy efficiency of spring barley has been studied. The aim of the work was to identify the impact of the implemented tillage systems with elements of minimization and fertilization with elements of biologization on the productivity and economic performance of spring barley. It is established that in the conditions of the Right-Bank Forest-Steppe of Ukraine the aftereffect of application of high norms of organic and mineral fertilizers on typical chernozem has a positive effect on spring barley yield, increasing it, compared to control, by 0.55–1.10 t/ha per plowing, by 0, 65–1.35 t/ha for deep tillage and 0.55–1.30 t/ha for shallow tillage. It was found that the highest crop yield (3.85 t/ha) was obtained against after shallow tillage and aftereffects of fertilizer application with manure. The use of fertilizers helped to increase the protein content in the grain of spring barley. The influence of tillage systems on the protein content of barley was reliably noted only in the variant of fertilizers with straw & green manure. The use of shallow tillage with organic manure and fertilizer provides a decrease of 142.9 UAH/t of the cost of production, an increase of 886 UAH/ha of net profit and a 21.2% reduction in energy consumption compared to plowing.

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