Influence of mineral fertilizers on yielding capacity and quality of soft spring wheat grain

Received: March 13th, 2021 ; Accepted: June 6th, 2021 ; Published: June 10th, 2021 ; Correspondence: [email protected] aim of the study is optimization of nutrition system for soft spring wheat plants through the use of mineral fertilizers in order to obtain high quality grain with simultaneous yield increase. Different doses of mineral fertilizers were tested in the study. The object of study was a variety of soft spring wheat ‘Uliublena’. The structure of the crop was determined by the method of selecting sheaf samples from each accounting area. The leaf surface area was determined by calculation method. According to the results of research, yield capacity of soft spring wheat on average ranged from 2.43 to 4.51 t ha-1 . The highest index of gluten amount was obtained in the variant with fertilizers dose N64P64K64 - 28.19%, which is higher than in the variants with fertilizer doses N16P16K16 and N32P32K32 by 6.11 and 0.15%. The highest increase in the yield of soft spring wheat grain (2.08 t ha-1 ) was obtained with application of N64P64K64, slightly lower yield increase was obtained with application of N32P32K32 - 1.64 t ha-1 , and N16P16K16 - 0.99 t ha-1 comparing with the control. With fertilizer dose of N64P64K64 soft spring wheat provided the maximum yield - 4.51 t ha-1 , gluten content - 28.19% and protein content - 14.21%

Adaptation of various maize hybrids when grown for biomass

Received: January 10th, 2022 ; Accepted: May 1st, 2022 ; Published: May 10th, 2022 ; Correspondence: [email protected] aim of this research is to optimize growth and development of maize for biomass by selecting maize hybrids to fulfill their productivity potential. The following maize hybrids were the subject of research: Forteza, DM Native, DM Skarb. The greatest height of plants was formed in the interphase period of milk-wax maturity of grain in hybrid Forteza - 286.4 cm. In hybrid DM Native the height of plants was - 271.2 cm, hybrid DM Skarb - 263.6 cm. Weight of one plant of hybrids studied during the maize growing season ranged from 442 g to 760 g. Thus, the largest mass of maize plants was recorded in the milk-wax maturity stage. It was the largest at the hybrid Forteza and amounted to 760 g, that is more than at the hybrid DM Native for 3.4% (26 g) and at the hybrid DM Skarb for 6.6% (50 g). The average crop yield of the hybrid Forteza for the period of research was 55.1 t ha-1 . Hybrids DM Native and DM Skarb provided this indicator at the level of 50.6 and 45.7 t ha-1 respectively. Hybrid Forteza provided a maximum crop yield 55.1 t ha-1 with plant height 286.4 cm, assimilation surface of one plant and a crop 0.59 m2 ; 42.8 thousand m2 ha-1 and plant weight 760 g

Thermoelectric studies of electronic properties of ferromagnetic GaMnAs layers

Thermoelectric power, electrical conductivity, and high field Hall effect were studied over a broad temperature range in ferromagnetic Ga₁₋xMnxAs epitaxial layers (0.015 ≤ x ≤ 0.06). Thermoelectric power analysis gives information about carrier transport mechanisms in layers with both metallic and non-metallic types of conductivity and allows determination of the Fermi energy and carrier concentration. At high temperatures (T > 70 K), the thermoelectric power in GaMnAs linearly increases with increasing temperature. That indicates the presence of a degenerate hole gas with the Fermi energy EF = 220 ± 25 meV, nearly independent of Mn content (for 0.02 ≤ x ≤ 0.05). At lower temperatures, GaMnAs layers with metallic-type conductivity show an additional contribution to the thermoelectric power with the maximum close to the Curie temperature

Use of Johnson–Cook plasticity model for numerical simulations of the SNF shipping cask drop tests

The paper presents the results of a numerical simulation for the strains and damage caused by the drop of a TUK-128 SNF shipping cask on a bar. This is a design basis accident in the SNF land transport outside hazardous sites (an NPP or a processing plant). Strains caused by a cask drop on a bar are calculated and simulated in the elastoplastic behavior region of structural materials. The simulation results depend heavily on the method used for defining the plastic properties of materials. The most common way for taking account of plasticity is to set a tabulated function that gives the link between stresses and plastic strains. Such plasticity definition fails to take into account not only the temperature dependence of plasticity properties but also the kinematic strengthening of the material (dependence of yield strength on intensity of strains). However, this plasticity model leads to a major decrease in the complexity of computations which is especially important when dozens of design cases need to be analyzed. Another (more adequate) approach to plasticity definition is to take into account the change in the yield strength not only depending on the strain magnitude and intensity but also on temperature (Johnson–Cook plasticity model). In this case, 5 to 7 parameters need to be determined for each type of structural material. Presently, there is no well-defined way to determine these parameters; for this reason, the authors suggest a procedure for finding them. A drawback of this approach is a much greater complexity of computations. Therefore, the paper presents a comparative analysis of the calculation results with the plasticity definition by the Johnson–Cook model and using a tabulated function. Simulations were performed for two design cases: a drop with an impact on the cask lid (stainless steel) and a drop with an impact on the cask bottom (high-strength cast iron). The considered options to define plastic properties of structural materials are compared against the TUK-128 cask drop test results. The impact was simulated by finite element method using the LS-Dyna code

Обоснование безопасности перехода на применение сталеалюминиевых проводов в шахтных контактных сетях электровозной откатки при техническом перевооружении рудника

Methodology of justification of safety of the transition to application of steel-aluminum wires in contact networks of locomotive roadway during the technical modernisation of mine had been done

Вовлечение техногенных минеральных объектов в полный цикл освоения рудных месторождений: решение проблем техносферной безопасности

The methodology was substantiated and geological surveys were conducted at the tailing dump of the Sibay processing plant, after which assessment work was carried out. As part of the assessment work, 4 pilot holes were drilled, and testing was carried out. In the course of testing the tailings, the heterogeneity of its structure, color range, particle size, mineralogical and chemical composition, the presence of a large number of clay fractions was revealed. The variability of the physico-mechanical characteristics of the massif of the tailings and material composition, the high viscosity of the technogenic mass, the low stability of the massif led to detailed studies to evaluate the patterns of distribution of raw material moisture in the massif of the tailing, the acid-alkaline properties and the redox potential of the tailing dump materials, the patterns of distribution of industrial significant elements

Initial and post-cryogenic assessment of viability of russian plum cultivars pollen (

The viability of pollen of 5 collectible varieties of Russian plum of the Pushkinskiye and Pavlovskiye VIR Laboratories SPB before and after cryopreservation was studied. It was found that a significant factor for the level of pollen viability is “variety” (p=0.07), the factors “cryopreservation” (p=0.457), “year” (p=0.221), as well as the interaction of the factors “variety× cryopreservation” (p=0.172), were not significant at the p<0.05 level of significance. For long-term storage of Russian plum pollen in liquid nitrogen, the year of pollen collection is not a significant factor. For most genotypes, no negative impact of cryoсonservation on pollen viability was revealed. The varieties ‘Aureus’, 'Podarok Sankt-Peterburgu’ and ‘Exotica’ after cryopreservation for 1 year showed a tendency to increase the pollen viability indicators

Проблемы и перспективы вовлечения хвостов обогащения золото-мышьяковистых руд в эксплуатацию для решения экологических проблем региона

In the framework of the expedition of 2018, technogenic formations generated in the late 19th and first half of the 20th centuries on the basis of the Novotroitsk deposit processing tailings were studied. The research methodology included the analysis of satellite observations and field geological and geophysical studies, drilling of geological wells with sampling along the depth of the massif, evaluation of the structure of man-made massif and technological properties of technogenic materials to select the parameters of technologies for its exploitation and processing. The results of the studies showed that arsenic is present in all the samples taken at the depth of the dump. It has been established that the As content with depth increases, which indicates the processes of sulfide oxidation and arsenic migration from the surface layers to the environment. This confirms the expediency of involving the old ore processing tailings into operation with subsequent disposal in specialized storage facilities, including isolated landfills and underground stopes. Based on the results of the research, technological solutions have been proposed for the involvement of tailings into commercial operation with substantiation of the priority order and development direction of mining of the old tailings storage of the Novotroitsk deposit