scholarly journals Methodology of determination of intensity of soil burial and emission loss of carbon agro-landscapes of left bank in Polissya the event of a plane vegetation period

2019 ◽  
pp. 238-243
Author(s):  
P. Trofymenko ◽  
◽  
N. Trofimenko ◽  
S. Veremeyenko ◽  
F. Borysov ◽  
...  
Keyword(s):  
Vegetation Period ◽  
Left Bank ◽  
Soil Burial ◽  
Emission Loss

The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

2019 ◽  
Vol 70 (11) ◽  
pp. 3903-3907
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Transport Equation ◽  
Turbulent Diffusion ◽  
Diffusion Coefficients ◽  
Aquatic Ecosystems ◽  
Specific Area ◽  
Left Bank ◽  
The Right ◽  
Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.

The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

2019 ◽  
Vol 70 (11) ◽  
pp. 3903-3907
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Transport Equation ◽  
Turbulent Diffusion ◽  
Diffusion Coefficients ◽  
Aquatic Ecosystems ◽  
Specific Area ◽  
Left Bank ◽  
The Right ◽  
Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of Péclet, calculated for each specific area: the left bank, the right bank and the middle of the river.

scholarly journals Ergosterol content in selected grasses on the end of vegetation period

2007 ◽  
Vol 55 (4) ◽  
pp. 9-14 ◽  
Author(s):  
Vlastimil Dohnal ◽  
Ilona Kaderová ◽  
Alena Ježková ◽  
Jiří Skládanka
Keyword(s):  
Festuca Arundinacea ◽  
Lolium Multiflorum ◽  
Dactylis Glomerata ◽  
Vegetation Period ◽  
Ultraviolet Region ◽  
Forage Crops ◽  
Liquid Chromatographic Method ◽  
Arrhenatherum Elatius ◽  
Liquid Chromatographic

Ergosterol is a natural compound with steroidic structure produced mainly by fungi. Due to this, it is considered as a marker of fungal spoilage. In this work, the content of ergosterol was monitored in samples of three forage crops (Festuca arundinacea x Lolium multiflorum, Dactylis glomerata, Arrhenatherum elatius) during period October–December 2005 and different term of summer harvesting (June or July). There were adapted and applied liquid chromatographic method with fotometric detection in ultraviolet region for determination of this compound. It was found, that the content of ergosterol strongly increased in all december’s samples with small variations between all three forage crops. Samples, where the summer harvest was performed in July had significantly lower content of ergosterol. Obtained results showed that level of monitored compounds was under limits in all samples.

scholarly journals To prevent the distribution of new weeds of the genus Erigeron L.

2019 ◽  
pp. 21-24
Author(s):  
O. Kurdyukova ◽  
O. Tyschuk
Keyword(s):  
Steppe Zone ◽  
Perennial Grasses ◽  
Effective Control ◽  
Left Bank ◽  
Vegetable Crops ◽  
Vegetable Gardens ◽  
Fodder Crops ◽  
Erigeron Annuus ◽  
Methods Of Control

Goal. The purpose of the research was to determine the biological characteristics of species of the genus Erigeron, their distribution, harmfulness and methods of control. Мethods. The studies were conducted during 2006—2018 on the territory of the steppe zones of Ukraine in segetal and ruderal vegetation. The determination of the frequency of occurrence and spread of weeds was carried out in agrophytocenoses and uncultivated lands according to generally accepted methods. Evaluation of the harmfulness of weeds was carried out in the Left bank province of the Steppe zone of Ukraine. The soils are chernozemic soils ordinary meddle loamy. Latin plant names are listed on the Catalogue of Life international database. Results. All species of the genus Erigeron in the steppe zones of Ukraine differ in biological and ecological indicators, habitats, weediness and reaction to various methods of control. Erigeron annuus (L.) Pers. (Phalacroloma annuum (L.) Dumort., Stenactis annua (L.) Cass.) — wintering, less often spring weed. It occurs scattered or in groups, often forms thickets. It grows in meadows, gardens, parks, fallow, littered places, along the canals. It is identified in the fields of maize, sunflower, sorghum, melon crops and vegetable gardens. Erigeron strigosus Muhl. ex Willd. (Phalacroloma strigosum (Muhl. ex Willd.) Tzvel., Stenactis strigosa (Muhl. ex Willd.) DC.) — spring, wintering or biennial weed. It occurs as single individuals in meadows, littered places, edges of fields, near perennial grasses under irrigation. Erigeron strigosus var. septentrionalis (Fern. & Wieg.) Fern. (Phalacroloma septentrionale (Fern. & Wieg.) Tzvel., Stenactis septentrionalis (Fern. & Wieg.) Holub) — yearling, biennial or weed. It is found scattered or in groups on meadows, fallows, littered places, in populated areas, flower beds. It is identified in the fields of corn, sunflower, sorghum, fodder crops and vegetable gardens. Small tillage promotes Erigeron`s dissemination and resettlement, the abandonment of complete fallow, and the reduction of chemical protection. The grain yield with an average weediness of crops decreased by 23—28%, vegetable crops — by 16—19%, fodder crops — by 11—18%. An effective method of controlling weeds of the genus Erigeron is intensive autumn tillage. The use of herbicides in the autumn is impractical. In the spring, pre-sowing harrowing, cultivation and herbicides are used. Conclusions. Early detection of weeds of the genus Erigeron at the initial stages of invasion, effective control through intensive tillage in the autumn, the use of harrowing, cultivations and herbicides in the spring, fully prevents their distribution and resettlement in the steppe zones of Ukraine.

scholarly journals Dendroclimotological research of scots pine in stand of the Left-bank Forest-steppe of Ukraine

2017 ◽  
Keyword(s):  
Climatic Change ◽  
Tree Ring ◽  
Radial Growth ◽  
Climatic Factors ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Forest Steppe ◽  
Radial Increment ◽  
Left Bank ◽  
Second Period

Purpose of this research was to detect influence of climatic change on pine radial increment in stand in the Left-bank Forest-steppe of Ukraine as example 100-years-old stand at State Enterprise 'Kharkiv forest scientific research station’. Methods. Dendrochronological. Method of correlation function and multiple regressions (response function) were used to analyze the influence of climatic factors on tree radial increment. For this purpose computer program RESPO was used. Results. Tree ring series were built and were used for correlation analysis between climatic factors and pine radial increment for two periods: 1960-1988 and 1988-2016.Years of minimum (1933, 1942, 1956, 1972, 1976, 1976, 1987, 1992, 2002, 2006 та 2012) and maximum (1933, 1942, 1956, 1972, 1975, 1976, 1979, 1979, 1979, 1987, 1992, 2002 та 2012) of radial increment were detected. Depressions of pine radial increment were as a result of negative weather conditions: low and high winter and early-spring temperature, droughts during vegetation period. Maximums of radial increments were depended on favorable weather conditions for pine radial growth. Correlation and Response analysis for two periods showed that increase of temperature and precipitation, excluding winter precipitation, changed response of forest ecosystems to climatic change: if in first period (1960-1988) radial increment limited by April temperature and together July temperature positively influenced on radial growth, in second period (1988-2016) June temperature negatively infuenced on radial increment. Slight increase precipitation during vegetation period could not soften impact if high temperature during vegetatation period on tree radial increment. Conclusions. At comparison 1960-1988 and 1988-2016 it was detected that during first period positive influence of summer temperature on radial growth was distinctive and for second period one started to limit increment (negative influence) were detected. Slight increase of precipitation for vegetation period in second period significantly didn’t influence on pine radial growth. In second period increase of winter temperature and number of thaws negatively influenced on soil moisture, decreased of tree ring widths.

Ways to build up a trait collection of corn by vegetation period classes and its components

2020 ◽  
pp. 55-64
Author(s):  
N.V. Kuzmyshyna ◽  
V.K. Riabchun ◽  
S.N. Vakulenko ◽  
N.V. Tertyshna ◽  
Yu.O. Bibel
Keyword(s):  
Vegetation Period ◽  
Kernel Weight ◽  
Plant Production ◽  
Forest Steppe ◽  
Biological Traits ◽  
Left Bank ◽  
Economic Traits ◽  
Corn Hybrids ◽  
Cold Tolerant ◽  
The Usa

Aim. To study new collection corn accessions by vegetation period classes and its components to build up a trait collection. Results and Discussions. The experiments were conducted in the eastern left-bank forest-steppe of Ukraine in the scientific crop rotation fields of the Plant Production Institute named after VYa Yuriev of NAAS in 2016-2019 Field surveys and laboratory analyses were carried out using methodological approaches to studying collection corn accessions. The article presents the results on building up a trait collection of corn, which includes 111 collection accessions of new domestic self-pollinated corn lines, diverse in their genetics, identified as carriers of a set of valuable economic and biological traits on the basis of previous studies. The pedigrees of the lines included seven synthetic populations from Australia and one synthetic population from the USA, three varieties from China, two varieties from Ukraine, two varieties from Syria, four lines from Ukraine, seven lines from the USA; three hybrids from Thailand, one hybrid from France, one hybrid from Serbia, and one hybrid from Egypt. Due to multi-year studies of corn collection accessions, sources of valuable economic traits with high levels of their expression were identified. The sources are of interest for breeding to create corn hybrids. Conclusions. We grouped the lines was selected lines that are suitable for breeding: 24 lines with early emergence of seedlings (11-12 days), 29 lines with early anthesis (49–53 days), 64 lines with a minimum gap in anthesis (1-4 days), 14 lines with rapid water yielding belonging to various ripeness groups. We singled out cold-tolerant lines derived from a foreign (Egypt) hybrid (UKhK 653, UKhK 654, UKhK 655), from foreign (the USA, Australia) synthetics (UKhK 530, UKhK 692, UKhK 698). We also distinguished lines with increased productivity (86-116 g of grain per plant) and 1000-kernel weight (over 328 g): mid-early flint lines UKhK 724 and UKhK 727 derived from original French forms; nine mid-ripening lines originating from original Ukrainian (UKhK 612), American (UKhK 617, UKhK 618, UKhK 619), French (UKhK 725) and Egyptian (UKhK 653, UKhK 654, UKhK 655) forms; and one line from Thailand (UKhK 718), in which the vegetation period structure index ranged 0.8 to 1.0. We found sources of drought resistance: UKhK 719, UKhK 723, UKhK 724, and UKHK 726. Sources of good water yielding from grain are mid-early lines UKhK 690, UKhK 721, UKhK 730; mid-ripening lines UKhK 623, UKhK 631, UKhK 665, UKhK 672, UKhK 706 UKhK 715, UKhK 726; and mid-late lines UKhK 648, UKhK 652, UKhK 672, UKhK 720.

PRECISION OF LABORATORY MEASUREMENTS OF BREAKING STRENGTH OF TEXTILES

1947 ◽  
Vol 25f (4) ◽  
pp. 264-272 ◽  
Author(s):  
J. W. Hopkins ◽  
Muriel W. Weatherburn
Keyword(s):  
Breaking Strength ◽  
Test Procedure ◽  
Laboratory Measurements ◽  
Cost Factor ◽  
Test Strips ◽  
Soil Burial ◽  
The Cost ◽  
Additional Variance

Warp breaking strength was measured in five test strips from each of a series of duplicate pieces of cotton duck in rotproofing experiments. Breaks occurring at the jaws of the machine, which amounted to some 16% of the total, gave results about 3.5% lower and 20% more variable than non-jaw breaks. Discrepancies in non-jaw breaks of similarly treated fabric arose partly from variance in test strips from the same piece and partly from additional variance between duplicate pieces. Weathering tended to reduce intra-piece, and soil burial to increase both intra- and inter-piece variability. The tests as conducted were capable of discriminating differences of the order of 15 to 20%. Greater gains in precision would have resulted from increasing the number of replicate pieces than from increasing the number of strips tested per piece in the same ratio. However, determination of the most economical test procedure for specified precision in each type of material also required consideration of the cost factor, which was nearly three times as great per piece as per strip.

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