Use of sulfone in skin diseases     

V A Antipov  S Ia Semenov 《Veterinariia》1978,(4):97-99

  相似文献   

Natural resistance and productivity of local and imported pig breeds     

V. P. Rybalko  V. V. Semenov  V. I. Lozovoi  E. I. Serdyukov  L. V. Kononova  O. V. Pluzhnikova 《Russian Agricultural Sciences》2014,40(2):140-142

The results of monitoring the main productivity indices of pigs bred for a long time in the Stavropol krai and presently imported breeds are given. The adaptation level of natural resistance, which indicates better survival of progeny of local genotypes, is established.  相似文献   

Biokinetic indication of the mineralizable pool of soil organic matter     

V. M. Semenov  L. A. Ivannikova  T. V. Kuznetsova  N. A. Semenova  A. K. Khodzhaeva 《Eurasian Soil Science》2007,40(11):1208-1216

In three laboratory experiments with gray forest soils, the rates of mineralization of the bacterial mass, green oat mass, and cellulose applied in increasing doses were determined based on the measurement of the C-CO₂ emission. The substances applied were used as biological indicators of the mineralizable organic matter pool in the gray forest soils.  相似文献   

Dependence of Soil Organic Matter and Plant Residues Decomposition on Temperature and Moisture in the Long-Term Incubation Experiments     

Semenov  V. M.  Lebedeva  T. N.  Zinyakova  N. B.  Khromychkina  D. P.  Sokolov  D. A.  Lopes de Gerenyu  V. O.  Kravchenko  I. K.  Li  H.  Semenov  M. V. 《Eurasian Soil Science》2022,55(7):926-939

Eurasian Soil Science - Temperature and moisture are the main external factors controlling organic matter decomposition and mineralization in soil. The effect of temperature (8 and 22°C) and...  相似文献   

Daily dynamics of the number and activity of nitrogen-fixing bacteria in fallow and intensely cultivated soils     

N. R. Emer  A. M. Semenov  V. V. Zelenev  N. B. Zinyakova  N. V. Kostina  M. V. Golichenkov 《Eurasian Soil Science》2014,47(8):801-808

The daily dynamics (during 33 days) of the number (colony-forming units (CFU)) of nitrogen-fixing bacteria and of the nitrogen-fixing activity (the acetylene method) were determined in a gray forest soil under a fallow land and under an intensely cultivated field. The daily dynamics of the CFUs determined on the nitrogen-free medium in the samples from both plots had wavelike patterns. The daily values of the actual and potential activities of nitrogen fixation in the samples from the fallow land plot and of the actual activity of nitrogen fixation in the samples from the intensely cultivated soil were low and close to the detection limit. The potential activity of nitrogen fixation in the intensely cultivated soil was significant and also had a wavelike pattern. The harmonic analysis of the daily dynamics of the CFUs and nitrogen fixation showed the statistically significant harmonics of these biological characteristics pointing to the objective and regular character of the wavelike dynamics. The revealed dynamics of the biological characteristics of the soils and the methods of their analysis are important in terms of the comparative study of the biological properties of different soils.  相似文献   

Fertilizing effect of the increasing CO2 concentration in the atmosphere     

Kudeyarov  V. N.  Biel  K.  Blagodatsky  S. A.  Semenov  V. M.  Dem&#;yanova  E. G.  Dorodnikov  M. V. 《Eurasian Soil Science》2006,39(1):S6-S14

The effect of three atmospheric CO₂ concentrations (ambient, 400 ppm; double, 800 ppm; and triple, 1200 ppm) on the productivity of cottonwood (Populus deltoides Barr.) and the activity of the soil microbial biomass in the root-inhabited zone was studied. The total biomass of the cottonwood increased with increasing CO₂ concentration (2.28, 5.28, and 3.78 kg/tree for 400, 800, and 1200 ppm, respectively). The strongest responses were observed for the trunk and coarse roots (three and two times higher as compared to the ambient CO₂ concentration). The triple concentration of CO₂ had a greater effect on the roots of the trees, but the growth of leaves and branches was insignificant or absent. The shoot-to-root ratio changed as follows: 2.86, 2.80, and 1.57 at 400, 800, and 1200 ppm, respectively. The rate of C-CO₂ release from the soil samples incubated for 70 days increased in the following order: 400, 800, and 1200 ppm CO₂; the average values of the CO₂ emission were 2.02, 2.33, and 2.76 mg/100 g per day, respectively. The greatest content of C_mb (75.1 mg/100 g) was observed in the treatment with the triple CO₂ concentration, and the lowest content (53.7 mg/100 g) was found for the ambient CO₂ concentration. This study suggests that the responses of the cottonwood biomass and soil microbial activity vary depending on the CO₂ concentration. The microbial biomass gradually increased with increasing CO₂ concentration; the total plant biomass showed the highest response at the double CO₂ concentration, and the triple CO₂ concentration was likely to suppress the growth of the above-ground plant biomass.  相似文献