The etiology and therapy of postnatal endometritis in cows     

B Ia Semenov 《Veterinariia》1968,45(1):85-87

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Biologically Active Organic Matter in Soils of European Russia     

V. M. Semenov  B. M. Kogut  N. B. Zinyakova  N. P. Masyutenko  L. S. Malyukova  T. N. Lebedeva  A. S. Tulina 《Eurasian Soil Science》2018,51(4):434-447

Experimental and literature data on the contents and stocks of active organic matter in 200 soil samples from the forest-tundra, southern-taiga, deciduous-forest, forest-steppe, dry-steppe, semidesert, and subtropical zones have been generalized. Natural lands, agrocenoses, treatments of long-term field experiments (bare fallow, unfertilized and fertilized crop rotations, perennial plantations), and different layers of soil profile are presented. Sphagnum peat and humus–peat soil in the tundra and forest-tundra zones are characterized by a very high content of active organic matter (300–600 mg C/100 g). Among the zonal soils, the content of active organic matter increases from the medium (75–150 mg C/100 g) to the high (150–300 mg C/100 g) level when going from soddy-podzolic soil to gray forest and dark-gray forest soils and then to leached chernozem. In the series from typical chernozem to ordinary and southern chernozem and chestnut and brown semidesert soils, a decrease in the content of active organic matter to the low (35–75 mg C/100 g) and very low (<35 mg C/100 g) levels is observed. Acid brown forest soil in the subtropical zone is characterized by a medium supply with active organic matter. Most arable soils are mainly characterized by low or very low contents of active organic matter. In the upper layers of soils, active organic matter makes up 1.2–11.1% of total C_org. The profile distribution of active organic matter in the studied soils coincides with that of C_org: their contents appreciably decrease with depth, except for brown semidesert soil. The stocks of active organic matter vary from 0.4 to 5.4 t/ha in the layer of 0–20 cm and from 1.0 to 12.4/ha in the layer of 0–50 cm of different soil types.  相似文献   

Agrogeochemical cycles of plant nutrients in the territory of Russia     

V. N. Kudeyarov  V. M. Semenov 《Eurasian Soil Science》2008,41(13):1463-1468

The contribution of mineral fertilization to the agrogeochemical cycles of major nutrients (N, P, K) was estimated. The agrogeochemical budgets of major nutrients (NPK) in the territory of Russia are unfavorable for agricultural production for the present and the nearest future. The removal of major nutrients with crops significantly exceeds their input to the soil with fertilizers and other sources. The nutritional degradation of arable soils increases, which can result in irreversible catastrophic consequences within 20–30 years.  相似文献   

Plant Residues Decomposition and Formation of Active Organic Matter in the Soil of the Incubation Experiments     

Semenov  V. M.  Pautova  N. B.  Lebedeva  T. N.  Khromychkina  D. P.  Semenova  N. A.  Lopes de Gerenyu  V. O. 《Eurasian Soil Science》2019,52(10):1183-1194

Eurasian Soil Science - The decomposition and mineralization of various plant residues (oak and aspen leaves, pine needles, small branches and thin roots of trees, aboveground biomass and roots of...  相似文献   

Ultrafast probing of core hole localization in N2     

Schöffler MS  Titze J  Petridis N  Jahnke T  Cole K  Schmidt LP  Czasch A  Akoury D  Jagutzki O  Williams JB  Cherepkov NA  Semenov SK  McCurdy CW  Rescigno TN  Cocke CL  Osipov T  Lee S  Prior MH  Belkacem A  Landers AL  Schmidt-Böcking H  Weber T  Dörner R 《Science (New York, N.Y.)》2008,320(5878):920-923

Although valence electrons are clearly delocalized in molecular bonding frameworks, chemists and physicists have long debated the question of whether the core vacancy created in a homonuclear diatomic molecule by absorption of a single x-ray photon is localized on one atom or delocalized over both. We have been able to clarify this question with an experiment that uses Auger electron angular emission patterns from molecular nitrogen after inner-shell ionization as an ultrafast probe of hole localization. The experiment, along with the accompanying theory, shows that observation of symmetry breaking (localization) or preservation (delocalization) depends on how the quantum entangled Bell state created by Auger decay is detected by the measurement.  相似文献   

Distribution of active organic matter in the soil profiles of natural and agricultural ecosystems     

A. K. Khodzhaeva  V. M. Semenov 《Eurasian Soil Science》2015,48(12):1361-1369

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The role of mineralization of the organic matter of soddy-podzolic and peat bog soils in the accumulation of <Superscript>137</Superscript>Cs by plants     

A. S. Tulina  V. M. Semenov  N. N. Tsybul’ka  T. P. Shapsheeva  A. A. Zaitsev  T. V. Arastovich 《Eurasian Soil Science》2010,43(10):1109-1119

The role of mineralization of soil organic matter (SOM) in the mobilization of ¹³⁷Cs was estimated on the basis of data on the biokinetic fractionation of the organic matter of soddy-podzolic sandy-loam and peat bog soils and on the coefficients of the soil-to-plant transfer of radiocesium under field conditions. The peat bog soils were richer than the soddy-podzolic soils in the total organic carbon (by 7.9–23.8 times), the potentially mineralizable carbon (by 2.4–6.5 times), and the carbon of the microbial biomass (by 2.9–4.6 times). The agricultural use of the soddy-podzolic and peat bog soils led to a decrease in the SOM mineralization capacity by 1.1–1.8 and 1.4–2.0 times, respectively. Simultaneously, the portions of the easily, moderately, and difficultly mineralizable fraction of the SOM active pool changed. The coefficients of the ¹³⁷Cs transfer from the peat bog soils to plants were 3.3–17.6 times higher than those for the soddy-podzolic soils. The content of ¹³⁷Cs in plants grown on the peat bog soils was 2–65 times higher than that in the mobile (salt-extractable) soil pool by the beginning of the growing season. Strong positive linear correlations were found between the coefficients of the soil-to-plant transfer of ¹³⁷Cs and the total content of the SOM, the content of the microbial biomass, the content of the potentially mineralizable carbon, and the intensity of its mineralization. It was concluded that the decisive factors controlling the intensity of the ¹³⁷Cs transfer from mineral and organic soils into plants are the SOM content and its mineralization potential. The mineralization of the SOM is accompanied by the release of both ¹³⁷Cs and mineral nitrogen; the latter facilitates the transfer of radiocesium into plants.  相似文献   

Polymorphism of H-FABP and ESR genes and their role in forming productivity of pig meat breeds   总被引：1，自引：0，他引：1  

V. P. Rybalko  V. V. Semenov  I. G. Rachkov  O. V. Pluzhnikova  A. R. Kagramanov  L. V. Kononova  E. I. Serdyukov  V. I. Lozovoi 《Russian Agricultural Sciences》2012,38(5-6):393-395

Data on the polymorphism and frequency of H-FABP type D and ESP Genes in Duroc Breed and Early Maturing Meat of the steppe-type breed are given. The effect of H-FABP and ESR genes on pig productivity is shown.  相似文献   

Quantifying the effect of uncertainty in soil moisture characteristics on plant growth using a crop simulation model   总被引：1，自引：0，他引：1  

Conor Lawless  Mikhail A. Semenov  Pete D. Jamieson 《Field Crops Research》2008

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Some problems of standardizing the work of laboratory workers     

N V Semenov 《Veterinariia》1967,44(12):102-104

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