Exit Phase Research Articles

A Qualitative Analysis to Determine the Critical Features of a Frontside Bottom Turn in Professional Surfing.

Surfing bottom turns underpin the quality of subsequent maneuvers, and surfing performance overall. Despite this, no study has investigated coaching cues to determine their association with performance. This study investigated the frontside bottom turn, to identify critical features associated with quality performance, and second to determine whether any of these features could predict whether a surfer would subsequently perform either a cutback or a top turn maneuver. Videos of every frontside bottom turn from all finals heats of the 2017 World Surf League, Corona Open Jeffrey's Bay event were analyzed. A total of 199 frontside bottom turns were identified and categorized as either a bottom turn leading to a cutback maneuver (n = 106), or a bottom turn leading to a top turn maneuver (n = 93). A checklist of 47 potential critical features was developed after consultation with coaching and competition judging experts, thereby enabling a systematic analysis of each turn to determine the expected and actual frequency of occurrence for each potential feature. Consequently, an extensive list of critical features of the frontside bottom turn was identified and associated with a high level of performance, being executed successfully by professional athletes during high-stakes competition. Several features, particularly during the exit phase of the bottom turn, also helped predict whether these athletes subsequently performed either a cutback or a top turn maneuver. The findings of this study provide surf coaches with cues that can be used as a guide to effectively coach two main frontside bottom turn variations.

Simulations of the stationary Q = 10 and the exit phase from the flat-top of an ITER 15MA baseline scenario: predictive JINTRAC simulation with a consistent treatment of D and T in the whole plasma

Abstract Designing a robust termination scenario for a burning ITER plasma is a challenge that requires extensive core plasma and divertor modelling. The presented work consists of coupled core/edge/SOL/divertor simulations, performed with the JINTRAC code, to study the Q = 10 flat-top phase and exit phase of the ITER 15 MA/5.3 T DT scenario. The modelling utilizes the recently implemented option to treat deuterium and tritium separately in the SOL/divertor, enabling a consistent treatment of deuterium and tritium in the whole plasma volume, which is a unique capability of JINTRAC. In addition, these are the first JINTRAC simulations of this scenario that use a first-principles transport model to self-consistently model the ECRH power deposition and to include tungsten while keeping track of tungsten sputtering and accumulation. The flat-top simulations demonstrate the possibility of sustaining a steady state fusion Q of 10 using pure deuterium gas puffs together with DT mixed pellets, which is an option to make a more effective use of tritium. Simulations of the exit phase are set up sequentially, with each phase providing initial conditions for the next, starting with a density decay at full current and auxiliary power, and demonstrate the possibility of reducing the density robustly within a few seconds. Following the density decay, a subsequent auxiliary power ramp-down in H-mode is performed with a late H–L transition at low auxiliary power, which may provide an option for the optimization of the plasma termination. The final ramp-down phase consists of a current ramp-down in L-mode to 3.75 MA.

ВЛИЯНИЕ НОВОГО ОРГАНО-МИНЕРАЛЬНОГО КОМПЛЕКСА ГУМИТОН НА ПРОДУКТИВНОСТЬ И КАЧЕСТВО ЗЕРНА ОВСА

According to the data of microfield experience on soddy-podzolic neutral soil, it was shown that the treatment of oat crops with an organo-mineral complex based on Gumiton peat during the exit phase into the tube contributed to an increase in grain yield by 23% compared to the control. The content of crude protein, fiber and fat increased by 10.0; 11.6; 16.0%. The introduction of main fertilizer PhosAgro NPK (8:20:30) led to an increase in grain yield by 50.3% relative to the control. The content of crude protein, fiber and fat increased to the level of variants with use of Gumiton in the control. Processing of plots with PhosAgro NPK (8:20:30) Gumiton increased yields by 4.5% and indicators of protein, fiber, fat by 4.2; 6.5; 10.4%, respectively.

Theta Phase Precession and the Dynamics of Spatiotemporal Asymmetry in Hippocampal Place Fields

A consistently observed characteristic of hippocampal place fields is the shifting of the field's center of mass and the subsequent development of asymmetry. This is evidenced by the expansion of the place field in an asymmetric manner over repeated traversals, wherein a rat's initial entry into the field prompts a low firing rate that substantially increases as it exits. Our study delves deeper into these spatiotemporal asymmetries of place field spiking, specifically examining their relationship with theta oscillations and disentangling the effects from environmental factors. Analysis of neuronal data from a T-maze alternation task revealed a distinct non-uniform firing pattern of place cells. This pattern was markedly skewed in relation to the phases of theta cycles, indicating a phase precession effect. We found that as the rat navigates through the place field, there is a systematic advancement of spike timing, with action potentials tending to cluster in the early phases of theta during the exit phase of the field. Such temporal coordination of spikes suggests that the timing of neural activity within theta cycles is as integral as spatial location, influencing the dynamics of place field expansion and potentially affecting the hippocampal local field potential. This discovery underscores the role of theta phase precession in spatial encoding, proposing a novel temporal component that could underpin the cognitive map within the hippocampus. R01 MH126236 R01 AG055544. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Approximate theory of armour perforation by ductile hole expansion

The present study suggests a complete analytical model for armour perforation by ductile hole enlargement process. The new approximate model is applicable for entry, tunnelling and exit phases of a rigid nose-pointed projectile with an arbitrary nose-shape. The theory is based on dividing the target into infinitesimal thin layers, in which a cylindrical hole expansion is assumed. The elastoplastic work that is consumed by the target for infinitesimal projectile advancement is based on the specific cavitation energy and leads to reduction of the projectile kinetic energy. Several equivalent formulae for ballistic limit velocity, and a formula for the ballistic limit thickness are found to be independent of projectile nose-shape and nose length. The approximate model is compared with numerical simulations for AA6061-T651 targets that are impacted by two different ogive nose-shape projectiles at several striking velocities. A small nose-shape effect on the ballistic limit velocity is observed in the numerical simulations and is attributed mainly to the target axial effect and the bulge formation at the target rear surface, which are not considered in the approximate model.

Behavioral Patterns of Drivers under Signalized and Unsignalized Urban Intersections

Under the general trend of mixed traffic flow, an in-depth understanding of the driving behaviors of traditional vehicles is of great significance for the design of autonomous vehicles and the improvement in the safety and acceptance of autonomous vehicles. This study first obtained microdata on the behaviors of drivers through driving simulation experiments and conducted research in stages. Then, generalized linear mixed-effects models were constructed to study the main effects and interaction effects of driver attributes and traffic conditions on driving behaviors. The data analysis shows that the overall speed of drivers passing through intersections follows a “deceleration acceleration” mode, but the fluctuations are more pronounced at signalized intersections, and the signal control significantly changes the position of the lowest speed when turning left. According to the different signal control and driving tasks, there are significant differences in a driver’s acceleration patterns between the entry and exit stages. A driver’s heart rate fluctuates greatly during the exit phase, especially during straight tasks. Compared with other indicators, the change in the gaze duration is not significant. In addition, interaction effects were observed between driver attributes and traffic conditions, with participants exhibiting different behavioral patterns based on their different attributes. The research results can provide a basis for the design of driving assistance systems and further improve the interactions between autonomous vehicles and traditional vehicles at intersections.

Species diversity and abundance of aphids in triticale crops in North-West Russia

The aphid complex of triticale crops in the Leningrad region was characterized by a large species diversity (20 species), but low abundance (1.6 specimens/trap), which, under the influence of weather conditions, varied 2.4–3.8 times depending on the crop. Winter triticale crops were inferior to spring triticale in terms of species diversity (9 vs. 18 species) and abundance of aphids (1.2 vs. 1.9 specimens/trap). The numerical majority were species whose food specialization is related to cereal vegetation (53.8%-71.4% of individuals). The mass species were Rhopalosiphum padi L. and Sitobion avenae F., which accounted for 25.7% and 23.0% of the total number of individuals. The presence of other aphid species in grain crops is due to the presence of weeds (25.7%-26.9% of individuals), the growth of other crops nearby (2.9%-10.3%), woody and shrubby vegetation (0%9.0%). The greatest species diversity and abundance of aphids in crops of both winter and spring triticale was noted in the second decade of June, when the stage development of the former corresponded to the earing phase, and the latter to the tube exit phase.

Hybrid entrepreneurs: The value of experience

ABSTRACTHybrid entrepreneurs—individuals acting simultaneously as entrepreneurs and employees—are often considered to be in a transitional stage toward becoming full-time entrepreneurs. However, they may also exit a venture or remain hybrid entrepreneurs. In this research, we investigate how being a hybrid entrepreneur impacts innovative opportunity recognition through entrepreneurial learning and how the exit experience may influence this mechanism. We use a standard logit approach, a causal mediation analysis, and the multilevel random effect model as a robustness test on a large cross-sectional sample of individuals of different ages and from 90 countries to test our hypothesis. Our findings indicate that, in the context of hybrid entrepreneurship, the exit phase could be part of a recursive stage rather than a final step. This implies that hybrid entrepreneurs can also be considered habitual entrepreneurs, as they may experience exits as an integral and iterative aspect of their entrepreneurial journey. We also found that this habitual entrepreneurship experience mediates the relationship between hybrid entrepreneurs and their potential to recognize opportunities and their innovative behavior.

Оценка продуктивности и экологической адаптивности сортов яровой пшеницы в условиях Среднего Предуралья

The article presents the results of scientific research for 2017-2020 on the variety testing of spring soft wheat in abiotic conditions of the Middle Urals. The varieties of spring wheat Iren and Yoldyz, respectively, had relatively higher yields of 490 g/m2 and 488 g/m2 in the competitive variety testing, which is significantly higher by 35 g/m2 and 33 g/m2 yields (455 g/m2) of the control variety Sim-birzit (NSR05 – 25 g/m2). The yield of these varieties was formed with a significantly higher 2% field germination of seeds, 21-60 pcs./m2 of productive plants and 21-37 pcs./m2 of productive stems for harvesting, 0.04-0.05 g of grain weight per ear. The highest average yield in the Yoldyz and Iren wheat varieties was due to a significant increase in the leaf surface area in the tube exit phase by 4.0 and 4.1 thousand m2/ha, in the earing phase – by 2.5 and 2.7 thousand m2/ha and in the phase of the dairy state of grain – by 1.4 thousand m2/ha relative to similar values in the standard Simbircite. The varieties Yoldyz and Iren formed the largest FP of 1275-1284 thousand m2 × day per 1 ha during the growing season, respectively. The varieties Iren and Yoldyz, in which the coefficient of plasticity was equal to 1.03 and 1.04, respectively (bi=1), are plastic, their yield corresponded to the change in growing conditions. The highest indicator of yield stability (0.12) was the spring wheat Iren. Keywords: SPRING WHEAT, VARIETY, YIELD, STRUCTURAL ELEMENTS, PHOTO-SYNTHETIC ACTIVITY OF PLANTS, PLASTICITY, ADAPTABILITY

If you build it, will they pass? A systematic evaluation of fish passage efficiency for three large-bodied warm-water fishes

Fish passages are constructed to facilitate movement around barriers, but few are quantitatively evaluated for non-salmonids. We quantified the efficiency of a selective, nature-like fish passage for three native fishes, Colorado pikeminnow ( Ptychocheilus lucius), flannelmouth sucker ( Catostomus latipinnis), and razorback sucker ( Xyrauchen texanus), in the San Juan River, NM, USA, by estimating the probabilities of completing three navigational phases and associated delay times. We compared passage efficiency in years when fish were captured in a trap and manually moved upstream to years when the trap was removed in the spring. All species were less efficient at navigating the attraction and exit phases compared with the ascent phase. Operating the passage without the trap generally increased passage success and shortened delay times. The mean probability of passage and delay time among species when the trap was removed ranged from 34%–55% and 5–21 days, respectively. Our results suggest species- and phase-specific variation in passage efficiency and highlight the need for evaluations to aid future passage design and operation for a greater diversity of fish.

The effectiveness of applying various doses of nitrogen fertilizer on spring triticale in the conditions of the Moscow region

Nitrogen is a key element in achieving high yields of grain crops. The study of the reaction of new varieties to the use of nitrogen fertilizers in eld experiments allows us to identify the most e ective techniques for realizing potential yields in speci c soil and climatic conditions. The research was carried out in 2020-2021 in the conditions of the Moscow region on sod-podzolic heavy loamy soils with a low humus content (1.3…1.7 %), high phosphorus content, average potassium content. The scheme of the experiment involved studying the e ect of increasing and fractional doses of nitrogen fertilizer from 30 to 150 kg of active substance per hectare, introduced in the form of ammonium nitrate (NH4NO3). Fertilization was carried out manually by seedlings, in variants with fractional application, the second dose was introduced into the exit phase into the tube. The objects of research were the varieties of spring triticale Timiryazevskaya 42 and Botanicheskaya 4, registered in the State Register of Breeding Achievements in 2022. Nitrogen fertilizers increase the height of plants of the Timiryazevskaya 42 variety by 4.7…10.2 cm, and the Botanicheskaya 4 variety by 8.7…10.1 cm. At the same time, the lodging of crops in the prevailing meteorological conditions was not noted in all variants of the experiment. When applying nitrogen fertilizers in doses from 90 to 120 kg / ha, the increase in grain yield on the Timiryazevskaya 42 variety was 3.61…5.10 t/ha to control (without fertilizers), on the Botanicheskaya 4 variety - 2.71…2.42 t/ha. The highest yield in the experiment was obtained when applying nitrogen fertilizers on the Timiryazevskaya 42 variety at a dose of 120 kg/ha - 9.99 t/ha, on the Botanicheskaya variety at a dose of 90 kg/ha - 7.16 t/ ha. The removal of batteries without fertilizers and high yields, when applying high doses of nitrogen fertilizers, indicate a higher yield potential of the Timiryazevskaya 42 variety, compared with the Botanicheskaya 4 variety.

Advances in cellular and molecular predatory biology of Bdellovibrio bacteriovorus six decades after discovery.

Since its discovery six decades ago, the predatory bacterium Bdellovibrio bacteriovorus has sparked recent interest as a potential remedy to the antibiotic resistance crisis. Here we give a comprehensive historical overview from discovery to progressive developments in microscopy and molecular mechanisms. Research on B. bacteriovorus has moved from curiosity to a new model organism, revealing over time more details on its physiology and fascinating predatory life cycle with the help of a variety of methods. Based on recent findings in cryo-electron tomography, we recapitulate on the intricate molecular details known in the predatory life cycle including how this predator searches for its prey bacterium, to how it attaches, grows, and divides all from within the prey cell. Finally, the newly developed B. bacteriovorus progeny leave the prey cell remnants in the exit phase. While we end with some unanswered questions remaining in the field, new imaging technologies and quantitative, systematic advances will likely help to unravel them in the next decades.

What Is Wrong with Winter Chill Models in Warm Climates?

Bud dormancy is an evolutionary strategy that protects temperate fruit trees from low temperatures during winter. With adequate winter chilling, it is a process consisting of a rapid entrance phase where growth inhibition increases to a maximum and is then released via an exit phase. This progression is, however, different in areas with insufficient winter chill. In such areas, the dormancy entrance phase is protracted, and the exit phase is often incomplete. Several chill models have been designed to describe the plants’ response to chill accumulation to match cultivar and site. Although it is known that these models are less accurate in warm winter areas, their accuracy during the two dormancy phases has always been assumed equal. The aim of this study was to investigate the accuracy of four chill models during the entrance and exit phases of bud dormancy of ‘Royal Gala’ buds from two contrasting climatic areas. One-year-old shoots were collected from commercial orchards and forced to determine their bud dormancy level. Before forcing, the shoots received varied amounts of chill additional to the field chill. The bud dormancy progression was represented as joint two- or three-line models to determine the entrance and exit phases. For each phase, the dormancy level of every sample was plotted against its chill accumulation based on four chill models (Chilling Hours, Utah, Positive Utah, and Dynamic Model). Results were compared to determine the ability of each model to predict the linearity of the dormancy progression. The results indicated that although all the models were able to describe the exit phase of bud dormancy successfully, none could describe a linear entrance phase. This suggests that during the onset of dormancy, buds respond to temperature differently to what is measured by the chill models making the models unreliable when winter chill is inadequate.

Il futuro come Utopia?

This paper aims to understand how the first phase of exit from the pandemic has changed the temporality of everyday life and produced an affective atmosphere characterized by a positive attitude towards the future. I will start by analyzing the link between utopia and everyday life: on the one hand, as a privileged area of prefigurative practices in the different versions of utopian realism, and on the other, as trapped in the present in the theories of presentification. I will then examine some emblematic cases of a ‘need for the future’ that emerged in the first exit from the pandemic in the spring-summer 2021. Finally, starting from the affective and temporally complex nature of the present as conceptualized by Berlant (Berlant, 2011; Berlant, 2008) and Coleman (Coleman, 2020b; Coleman, 2020a), I will try to account for the push toward the future that the partial exit from the pandemic has perhaps brought out.

Senior entrepreneurs: the impact of temporal perception on the entrepreneurial process

PurposeLonger life expectancy brings a new phenomenon: senior entrepreneurship. Whereas starting a business involves investing energy, time, money or other types of resources, ageing is somewhat incompatible with these terms. Research on the impact of time perception on the entrepreneurial process is rather scarce. Considering the lack of knowledge related to the impact of time perception on the entrepreneurship process, this study aims to answer the following research question: how does temporal perception influence the entrepreneurial process?Design/methodology/approachSenior entrepreneurs are the most relevant category of individuals from which the impact of time perception could be observed, as they are objectively closer to the end of their careers than younger entrepreneurs. Therefore, longitudinal research was conducted by interviewing five senior entrepreneurs at 4-year intervals.FindingsResults show that there are two types of temporal perception in entrepreneurship: temporal perception of the entrepreneur's career and temporal perception of the enterprise's development. When these two-time perspectives are not synchronized with the entrepreneur's vision, the entrepreneur develops strategies for seeking to re-establish synchronicity between the temporal perspective (TP) of their entrepreneurial career and that of the business development. The senior entrepreneur is distinguished from a traditional entrepreneur by a limited TP of their entrepreneurial career combined with the notions of bridge employment and generativity.Research limitations/implicationsThe number of cases under study did not allow us to examine every possible type of situation. The sampling of the cases under study did not offer great diversity in terms of gender, as the study had only men. However, the range of ages at startup, from 50 to 65 years, provides greater diversity, as does the range of business segments that included the service, manufacturing and retail food industries.Originality/valueEntrepreneurs with a limited career time perspective correspond to senior entrepreneurs, while others who have an open career prospect, regardless of their age, correspond to any other form of an entrepreneur. This study has also been able to identify that an entrepreneur who realizes their limited entrepreneurial career horizon and perceives a temporal purpose of their company in the service of the involved parties tends to plan the entrepreneurial exit phase.

Measuring the strength of motivation among medical students

Background: Motivation is what drives an individual from within, spurring him to achieve. Aim and Objectives: This study aims to measure the strength of motivation among undergraduate medical students at the entry and exit phases and compare the two, checking for the presence of any associated factors as well. Materials and Methods: This was a cross-sectional study at a private medical college in Chennai; 133 first-years and 100 final-years participated. Descriptive details of the participants were obtained through a questionnaire. Strength of motivation was measured using the Strength of Motivation for Medical School - Revised Questionnaire, consisting of 15 questions graded on a five-point Likert scale. Data were collected through Google Forms, entered into MS Excel, and analyzed using SPSS 21 software. Results: We found motivation levels to be quite high in both categories and total motivation scores did not show a significant difference between the two. Not much of a difference was observed with respect to the three motivation subscales either – readiness, willingness, and persistence – although it was observed that the readiness level was slightly lower than the other two factors in both sets of students. Conclusion: Motivation levels among MBBS students are high both at the entry and exit phases of the course. Educators would do well to harness this “resource” and use it to direct learners to greater academic achievement.

PS-C10-8: ANALYSIS OF OFFICE SYSTOLIC BLOOD PRESSURE MEASURED BY VARIOUS METHODS IN DIFFERENT CONDITIONS

Objectives: The aim of the study is to confirm results of our pilot study (presented ESH/ISH Glasgow 2021) and perform a detailed analysis of the larger sample size. Design and Method: BP monitors Nissei DM-3000 (both auscultatory and oscillometric), SunTech-40 and Fora P30 Plus, in both conditions, were used for office BP measurements (BPM) in triplets by one physician at the entry and exit phase of the 3 months home BP telemonitoring study. 122 treated patients with essential hypertension, aged 24–85 years, 60% of males, were referred by their physicians as well controlled. Their therapy was not changed during this study. Those starting BPMs in the office at the entry, started BPMs in the quiet room at the exit, and vice versa, approximately at the same time. On the other hand, the order of methods used both in the office and in the quiet room was not changed. Effects of gender, age, BMI, order of BPM (physician/quiet room - P/QR, order of BPM in triplets) and methods of BPM on systolic BP at the entry and exit of the study were evaluated. Linear mixed models with random effect of a patient were used for the statistical analysis of data. Results: Systolic BP (SBP) values significantly depended on the morning medication (yes, no, p = 0.005) and the method of BPM used (p < 0.001). SBP values of various methods varied in dependence on the phase of the study (entry, exit, p < 0.001), age (< 60,> = 60, p < 0.001) and BMI (< 30,> = 30, p < 0.001). SBP was not dependent on the measurement order P/QR significantly. If each method of BPM was analyzed independently on other ones, only auscultatory SBP depended significantly on the measurement order in triplets (p < 0.001). Decrease of mean SBP+SD from the first to the third BPM was seen only at the entry phase of the study - 128.8 + 13.0, 126.0 + 13.5 and 124.7 + 12.6 mmHg. Conclusions: Significant differences between BPM methods used in systolic BP measurement were found. Fora BP monitor showed especially higher mean SBP values probably due to a stress from the first contact with a telemonitoring equipment in the quiet room only at the entry (132.0 + 12.9) vs. (127.3 + 12.3) mmHg. We did not prove any influence of measurement order P/QR even when Fora was used in both attended and unattended conditions. If an independent analysis of BPM methods was used, only auscultatory SBP depended significantly on the measurement order in triplets, whereas no significant influence was shown in oscillometric methods.

Revisiting degron motifs in human AURKA required for its targeting by APC/CFZR1.

Mitotic kinase Aurora A (AURKA) diverges from other kinases in its multiple active conformations that may explain its interphase roles and the limited efficacy of drugs targeting the kinase pocket. Regulation of AURKA activity by the cell is critically dependent on destruction mediated by the anaphase-promoting complex (APC/CFZR1) during mitotic exit and G1 phase and requires an atypical N-terminal degron in AURKA called the "A-box" in addition to a reported canonical D-box degron in the C-terminus. Here, we find that the reported C-terminal D-box of AURKA does not act as a degron and instead mediates essential structural features of the protein. In living cells, the N-terminal intrinsically disordered region of AURKA containing the A-box is sufficient to confer FZR1-dependent mitotic degradation. Both in silico and in cellulo assays predict the QRVL short linear interacting motif of the A-box to be a phospho-regulated D-box. We propose that degradation of full-length AURKA also depends on an intact C-terminal domain because of critical conformational parameters permissive for both activity and mitotic degradation of AURKA.

Research on Spiral Tunnel Exit Speed Prediction Model Based on Driver Characteristics

The “white hole effect” alters the driving environment during a tunnel’s exit phase, making it more difficult and uncertain for drivers to access information and control their behavior, thereby endangering traffic safety. Consequently, the driving risk at the exit of a long spiral tunnel served as the subject of this study, and the Jinjiazhuang spiral tunnel served as the object of the natural vehicle driving experiment. Following the theory of a non-linear autoregressive dynamic neural network, a vehicle speed prediction model based on driver characteristics was developed for the exit phase of the tunnel, taking driver expectations and behavioral changes into account. It also classifies the driver’s behavior during the tunnel’s exit phase to assess the risk posed by the driver’s behavior during the tunnel’s exit phase and determine a dynamic and safe comfort speed. The study’s results indicate that the driver’s behavioral load changed significantly as the vehicle approached the tunnel exit. At the exit of the spiral tunnel, the vehicle’s actual speed was 71 km/h, which is below the speed limit of 80 km/h. This demonstrates that the expected change in the driver’s behavior in the tunnel exit phase was substantial. Therefore, setting the emotional safety and comfort speed so that the driver maintains a smooth comfort level in the tunnel exit phase can reduce the tunnel exit driving risk. The results of this study provide a benchmark for tunnel traffic safety and lay the groundwork for further development of vehicle risk warning settings for the tunnel’s exit phase.

THE INFLUENCE OF MINERAL AND MICROFERTILIZERS ON THE HEIGHT OF SPRING BARLEY PLANTS IN THE CONDITIONS OF THE RIGHT BANK FOREST STEPPE OF UKRAINE

Ukraine is a powerful participant in the world grain market, and grain stocks of domestic farmers are an integral part of global food security. Among cereals in the agro-industrial production of barley is a leading place in the structure of sown areas, it is second only to wheat. However, when conducting a comparative analysis of the yield of barley in Ukraine and other world producers, it should be noted that the average yield of its grain in our country is 2.5 t / ha, while in France it reaches 6.09 t / ha, Great Britain - 5 , 67, Germany - 5.69 t / ha [2]. Therefore, there is a need to find ways to increase the productivity of spring barley in specific conditions of its cultivation. One of the main ways to increase crop productivity is the stable growth and development of spring barley. Development is the formation of specialized organs and parts of aplant to perform its main biological function: the preservation of its species. Of particular importance in the cultivation of cereals are the processes of growth and development that underlie the formation of grains. One of the most important problems of plant growth and development in the technology of growing crops, in particular spring barley, is its growth processes. A characteristic indicator of growth processes, which affects the formation of crop yields, is its height. During our research, a lot of attention was paid to the development of culture in the right-bank forest-steppe of Ukraine.As a result, it was found that the height of plants increased from the germination phase to full maturity, due to increased plant biomass and depended on varietal characteristics and technological methods of cultivation and hydrothermal regime of years of research. Higher plant height in the phase of full maturity was observed in the variety Aizhan - 55 cm, and in the variety Aristei - 50 cm. It was found that depending on the factors studied, the height of spring barley plants in the tillering phase did not change significantly, but starting from the exit phase into the tube, the difference in height was significant. The application of mineral fertilizers provided an increase in the height of spring barley plants.