Resistance Properties Research Articles

Metal-nitrilotriacetic acid chelate derived strategy to selectively produce porous Ni/C, CoNi/C and Co/C magnetic heterostructured nanorods for lightweight and strong microwave absorption

Because of tempting magnetic-dielectric synergies and interfacial effects, designing a simple and low-cost route for producing multidimensional carbon-based magnetic nanocomposites is very important for the development of microwave absorbers (MAs). In this paper, a facile and propagable Ni-nitrilotriacetic acid chelate (NAC) derived strategy was proposed to selectively fabricate zero-dimensional (0D)/one-dimensional (1D) porous Ni/C magnetic heterostructured nanorods (MHNRs) consisting of 1D carbon nanorod, lots of pores and 0D Ni nanoparticles via a combined hydrothermal and thermally treated methods. The porous Ni/C MHNRs displayed the progressively improved Ni and C crystallinity by controlling the temperature, which resulted in the tunable electromagnetic and microwave absorption properties (MAPs). Additionally, 0D/1D porous CoNi/C and Co/C MHNRs could be selectively produced through this strategy by adopting CoNi-NAC and Co-NAC as precursors. Benefiting from desirable interface and magnetic/dielectric synergies, the acquired 0D/1D porous Ni/C, CoNi/C and Co/C MHNRs presented excellent MAPs and certain corrosion resistance properties. In especial, Co/C MHNRs displayed a strong absorption capacity (−47.89 dB), an ultrawide effective absorption bandwidth (8.40 GHz) and small matching thicknesses (∼2 mm), which were a desirable candidate for MAs. Consequently, a facile, low-cost and propagable metal-NAC derived strategy was proposed to synthesize 0D/1D porous carbon-based MHNRs, which presented an alternative technique to develop lightweight efficient MAs.

Preparation of eco-friendly multifunctional lyocell fabric with flame retardant, antibacterial and UV resistant using glucose-derived NP compounds.

A biomass-based finishing agent (ArCP) rich in nitrogen and phosphorus was synthesized from glucose, arginine and phosphorous acid, which was then used for lyocell fabrics to prepare flame retardant, antibacterial and UV resistant properties lyocell fabrics (ArCP-lyocell). The elemental composition, surface morphology, combustion performance, antibacterial and UV resistant properties for the lyocell fabrics before and after modification were investigated. ArCP-lyocell fabrics showed excellent self-extinguishing properties with a limiting oxygen index (LOI) of 35.1 % and maintained an LOI of 30.7 % even after 30 laundering cycles (LCs). Antibacterial experiments confirmed the antibacterial effect of ArCP-lyocell against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), with 99.9 % and 92.8 % inhibition rates, respectively. In addition, the modified fabrics exhibited excellent UV resistant properties with a UV production factor (UPF) of up to 184.54, and lower transmittance both UVA and UVB rays under 2 %. This study provides a simple and efficient approach for developing eco-friendly multifunctional textiles.

Influence of the dual-current method on the properties and growth mechanisms of micro-arc oxidation coatings

Although the micro-arc oxidation (MAO) technique can significantly enhance metal properties, the numerous variables involved in the preparation of MAO coatings lead to inconsistent properties. This study prepared MAO coatings using both single-current and dual-current methods with varied current parameters. The effects of these methods on the coating properties were investigated. Scanning electron microscopy (SEM) was used to analyze the microscopic and cross-sectional morphologies of the coatings prepared using both methods. Subsequently, the physical phase composition of the coatings was analyzed using X-ray diffraction (XRD). Finally, the coatings' tribological and corrosion resistance properties were evaluated through tribological and electrochemical tests. The results demonstrate that coatings prepared using the decreased-current method in dual-current mode exhibit outstanding abrasion and corrosion resistance. Moreover, the mechanism of action of the method is proposed, which provides a new idea and method to enhance the performance of MAO coatings in a simple and efficient way.

Microstructure Evolution and Wear Behavior of Stellite12 Coating Prepared by Laser-Directed Energy Deposition on H13 Steel

Laser-directed energy deposition (LDED) was employed to apply a Stellite12 coating onto an H13 steel substrate. This study explored the effects of processing parameters on the dimensions of the deposited tracks. Comprehensive examinations were conducted on the coatings to assess their phase composition, microstructure, and wear resistance properties. The relationship between microstructural characteristics and thermal field was investigated through a synergy of numerical simulations and experimental analyses. The findings revealed that the Stellite12 coating displayed a heterogeneous microstructure with epitaxial growth and a slight texture across successive layers. The primary phase comprised a γ-Co solid solution and M23C6 carbides, contributing to a significant enhancement in hardness, which was observed to be 2.2 times higher than that of the substrate. The coating demonstrated superior performance in terms of lower friction coefficients and reduced wear rates at both room and elevated temperatures. The predominant wear mechanisms identified were oxidative wear. These results underscore the promising applications of Stellite12 coatings in industrial contexts facilitated by LDED technology.

Effect of Ti addition on the microstructure and corrosion behavior of laser cladding AlCoCrFeNi high-entropy alloy coatings

AlCoCrFeNi high-entropy alloys (HEAs) has higher strength and wear resistance but poorer corrosion resistance. In the present investigation, the AlCoCrFeNi HEAs containing titanium(Ti) were fabricated via laser cladding to enhance the corrosion resistance properties of the coating and the influence of the Ti content on the microstructure of the coatings was investigated. The results show that the microstructure of the coating changed from a single BCC phase to a BCC+B2 phase with the addition of Ti. The Laves phases appeared within the coating when the Ti content was beyond 0.5 mol ratio. As an excellent corrosion-resistant element, Ti promoted the formation of a passive film and enhanced the corrosion resistance of the HEAs coating. The corrosion resistance of the coating first increased and then decreased with the addition of Ti, and the AlCoCrFeNiTi0.5 coating exhibited optimal corrosion resistance.

Enhancing the water resistance properties of bamboo particleboard by reconstructing lignocellulose through carbonization treatment

Bamboo particleboards are recognized as a highly promising alternative to traditional wood particleboards owing to their short growth cycle, abundant availability, and exceptional mechanical properties. However, bamboo particleboards frequently exhibit undesirable hygroscopicity, which limits their broader applications. This study introduces a straightforward and inhibitor-free carbonization treatment method to enhance the water resistance properties of bamboo particleboards. During the carbonization process, the degradation of hemicelluloses and amorphous cellulose, combined with the condensation reactions among lignin molecules, leads to a significant reduction in the hydrophilic hydroxyl and carbonyl group content, resulting in a more compact micro-fibril structure. Concurrently, the degradation of specific macromolecules within the cell wall facilitates the crushing of bamboo during particleboard pressing, thereby reducing the macroscopic pore size between the particles in the board. When compared to the original bamboo particleboard, the moisture absorption, 24-h water absorption (at a relative humidity of 50 %), 24-h thickness swelling, and bound water content of the deep carbon bamboo particleboard decreased by 32.28 %, 81.57 %, 67.16 %, and 66.7 %, respectively, while the water contact angle increased by 88.89 %.

Bonding wood via an organic-inorganic hybrid adhesive with excellent mechanical and fire resistance properties

Bonding wood via an organic-inorganic hybrid adhesive with excellent mechanical and fire resistance properties

Mechanical and thermo-oxidative resistance properties of natural rubber film reinforced by orange peel-based carbon dots

Bio-based carbon dots (CDs) have a wide range of precursor sources, abundant chemical functional groups, and good free radical scavenging ability. This makes them an excellent candidate for modifying natural rubber (NR). In this work, CDs were synthesized from orange peels using a hydrothermal process and were utilized to reinforce NR latex. The structure and properties of both the CDs (including morphology, functional groups and fluorescence emission spectra) and NR/CDs films (including crosslinking density, morphology, functional groups, and mechanical properties) were comprehensively investigated. The results indicate that the inclusion of CDs led to improvements in tensile and tear strength while maintaining undamaged elongation at break. The tube model results indicate that the Ge (the elastic modulus brought by entangled chains) is significantly higher than the Gc (the elastic modulus contributed by chemical crosslinking) in this system, suggesting that the physical entangled network play a more significant role than chemical cross-linking; and the trend of Gc+Ge with the amount of CDs aligns completely with the cross-linking density measured by swelling method. Additionally, it was observed that CDs exhibited excellent thermo-oxidative resistance properties for NR. After 24 hours of thermal aging, the aging coefficient increased from 20.7% (NR-0) to 65.8% (NR-7). Furthermore, with an increase in thermal aging time, the tensile strength and crosslinking density of NR-0 decreased at a faster rate compared with NR-5. At an aging time of 40 hours, the tensile strength of NR-0 was reduced to 0.53 MPa and almost completely failed; whereas the tensile strength of NR-5 was still maintained at 8.2 MPa. Overall, the addition of CDs dramatically improved the thermo-oxidative resistance and mechanical properties of the NR film. Simultaneously, a novel way involving the utilization of orange peel with high value is being proposed.

Influence of Carburizing Chromization Process on Mechanical Properties of ASTM A36 Steel

Research on changes in microstructure and hardness properties of ASTM A36 steel caused by carburizing-chromization process has been conducted. Carburizing-chromization treatment process was conducted at various temperatures: 850 ℃, 900 ℃ and 950 ℃ and holding time: 6 hours, 9 hours and 12 hours. Carburizing media in a mixture of solid powder charcoal/BaCO3 and ferrochromium/alumina/NH4Cl, with heating carried out in an electric furnace. The obtained layers were investigated using X-ray and electron diffraction, optical and scanning electron microscopy, and hardness measurements were carried out with micro Vickers, and potentiodynamic measurements. The thickness of the carburizing layers ranged between 50 and 500 µm. In addition to the host c-phase, the layers were mostly composed of carbides (Fe7C3, Cr23C6, Cr7C3, and Fe3C) and traces of a¢-martensite. The average hardness value decreases smoothly from 680 HV at the surface of the sample to 200 HV in the center of the sample. Potentiodynamic tests revealed that the chromized samples have lower corrosion resistance compared to the untreated material. For the strong chromization regime, the corrosion rate increases fourfold compared to the untreated material, while the microhardness of the coating is threefold greater. These materials are suitable for use in environments requiring good corrosion resistance and wear properties.

Carboxymethyl chitosan/peach gum polysaccharide packaging film incorporating Citrus sinensis essential oil effectively enhances the quality preservation of strawberries

Developing food packaging films loaded with plant extracts is a research hotspot. As natural preservatives, essential oils possess potent antibacterial and antioxidant properties. However, films loaded with essential oils face challenges in use for food preservation and flavor perception because of the strong aroma and volatility of components of the oils. In this study, natural, nontoxic Citrus sinensis essential oil (CSEO) was incorporated into blended films composed of carboxymethyl chitosan (CMCS) and peach gum polysaccharide (PGP), and the film properties were characterized. The CMCS/PGP films exhibited favorable performance (e.g., flexibility and antimicrobial activity). Addition of CSEO significantly improved the ultraviolet (UV)-barrier, oxidation resistance, hydrophobicity, and antimicrobial properties of the composite films. CPC1.0 film (containing 50:50 CMCS/PGP [w/w] and 1.0 % CSEO) showed enhanced elongation at break (99.59 ± 1.22 %), UV barrier performance (>85 % at 0.2–0.4 μm), and bactericidal activity (99.12 % for Staphylococcus aureus (S.aureus) and 93.62 % for Escherichia coli(E.coli)) compared with CMCS films. Packaging strawberries in CPC1.0 film maintained TSS (7.10 ± 0.26) and TA (0.77 ± 0.03) of the fruit, particularly flavor, resulting in a shelf-life of 6–8 days at room temperature. In soil, CPC1.0 film degraded by 78.53 % (by weight) in 10 days. This study shows that C. sinensis essential oil-loaded CMCS/PGP film has potential for application in fruit preservation and flavor retention.

Review about Application of Nelumbo Nucifera

Natural Fibers are obtained from nature. The natural sources of these fibres can be plants, animals or minerals. We selected the plant sources as Lotus (Nelumbo nucifera). Lotus(Nelumbo nucifera) an aquatic perennial plant cultivated widely from Pallapalayam pond, Pollachi. Natural fibers have the advantages of low density, low cost, and biodegradability. Lotus fabric has the same significance but is less popular compared to other natural fibers. This fiber is a unique and luxurious natural fiber and its properties are Softness due to the fine and delicate fibers, breathability, antibacterial, moisture-wicking, UVresistant, sustainable alternative to synthetic fibers. It is used for Textiles like scarves, shawls and clothing, fishing nets and ropes because it has water resistant properties and other marine equipment, handicrafts such as baskets, bags and other woven goods, paper, medical purposes like napkins, wet wipes, sutures, absorbent core sheet, diapers etc. The industry is embracing nonwovens (pads, wipes, napkins) and single-use materials to cater to the huge demand from the consumer community. Nelumbo nucifera (Lotus) was used in their study to enhance the good medicinal property and eco- friendly in nature. Sustainability issues in textiles have an exploration of many new fibers from renewable sources. Lotus plants require minimal water and no chemicals or pesticides, making the fiber environmentally friendly. It is also naturally resistant to water and stains, making it’s a range of products.

Integrated geophysical investigations of groundwater for sustainable management in Faisalabad region of Pakistan

As global and local populations surge and climate change continue to disrupt surface and groundwater reservoirs, the urgent need arises to explore additional groundwater sources. Ensuring sustainable management necessitates the efficient identification of high-potential zones to meet escalating water demands. This study aims to delineate groundwater potential zones in Faisalabad District, Pakistan, utilizing a cost-effective geoelectrical resistivity survey method. Apparent resistivity data was collected using the Schlumberger electrode configuration and analyzed with the Interpex “IX1D v2 model” to determine true soil layer resistivities and thicknesses with average root mean square error of 5.12%. The results have revealed that the Aquifer thickness ranged from 13.35 to 165.59 m, and resistivity from 23.96 to 1125.0 Ωm. Hydraulic conductivity, transmissivity, and porosity of aquifers varied from 0.49 to 24.11 m/day (average 8.214 m/day), 35.67 to 1593.98 m2/day (average 567.771 m2/day), and 22.29 to 39.82% (average 37.465%), respectively. Integration of resistivity and geo-hydraulic properties data identified vertical electrical sounding (VES) points 1, 3, 4, and 6 as highly suitable for large-scale freshwater extraction due to having high groundwater potential repositories (coarse sand and gravel formations). Other points had varying suitability: VES points 7 and 8 for shallow wells only, VES points 5, 9, and 10 not recommended due to hard formations, and VES point 2 due to poor groundwater quality. This integrated approach has proven effective in assessing groundwater strata to support Sustainable Development Goal (SDG-3), making it applicable to other geographic locations and informing policy decisions for effective groundwater management.

Performances of starch foam improved by an alginate coating

This research aims to develop an environmentally friendly food packaging based on starch foam coated with alginate. The foam was coated with various concentrations of an alginate solution (0, 0.5, 1.0, 1.5, and 2.0 %w/v). The effects of these coatings on the properties of starch foam were then investigated. The results showed that the alginate coating increased the density of the starch foam. Starch foam coated with the alginate solution at a concentration of 1.0 %w/v showed the optimum flexural stress at maximum load (4.72 MPa), hardness (96), and mass loss in water (5.51 %). These results showed significant improvements in these properties by comparison with the uncoated foam. The alginate coating slightly improved the thermal stability of the starch foam and did not significantly delay the biodegradation of the starch foam in soil. In conclusion, coating starch foam with an alginate solution presents a viable approach to developing sustainable food packaging materials with enhanced mechanical and water resistance properties.

Chiral structures of polymers influence their resistance to protein adsorption and bacterial adhesion as investigated by quartz crystal microbalance with dissipation

Chiral stereochemical strategy for antimicrobial adhesion is a newly-developed method with growing interest. However, the effect of chiral structures on the anti-biofouling property is still unclear. Herein, we employed quartz crystal microbalance with dissipation (QCM-D) to study the ability of two polyurethanes modified by distinct isomers of chiral borneol compounds to inhibit proteins adsorption and bacteria adhesion. Two types of polyurethanes containing endo-L-borneol-based side chains (PLBA) or exo-iso-borneol-based side chains (PIBA) were synthesized through a thiol-ene ‘click’ reaction and polyaddition polymerization. The structure, chirality and surface wettability of the polyurethanes (PLBA-PU/PIBA-PU) were investigated, confirming the intact molecular chirality of borneol and the improved surface hydrophobicity of the polyurethanes after introducing borneol-based side chains. We monitored the protein adsorption and bacteria adhesion on these polyurethane surfaces by QCM-D. The PLBA-PU and PIBA-PU surfaces exhibit enhanced protein resistance and antimicrobial adhesion properties. Moreover, significant difference in anti-biofouling performance was found by QCM-D between PLBA-PU and PIBA-PU, where L-configuration of borneol on the polyurethane surfaces provides enhanced anti-biofouling function compared to exo-iso-borneol.

A framework for phenotyping rubber trees under intense wind stress using laser scanning and digital twin technology

Rubber trees in coastal habitats are exposed to a high degree of wind stress. An algorithm-hardware synergetic methodology was developed for investigating and predicting rubber tree phenotyping excited by strong winds. The framework includes (1) a custom-designed industrial fan that recreates a variable airflow field at wind speeds of 15, 30 and 45 m/s coupled with a terrestrial laser scanner and bundled motion sensors to acquire point clouds and vibration data; (2) a graphic model that approximates tree canopies based on foliage clumps with phenotypic traits that are derived from point clouds captured while trees are subjected to aerodynamic drag; and (3) the wind characteristic parameters of forest canopies were calculated by a developed forest-specialized k-ε turbulence model combining the constructed tree models and grid-scale subdivision of the wind fluid field. (4) A digital twin model that incorporates detailed tree phenotypic traits and considers plant mechanical characteristics was established, depicting the related wind-induced actions of target trees under various wind influences. The results show that tree crowns with spreading forms are prone to yield larger pendulum amplitudes than compact crowns, but trees directly exposed to wind exhibit greater crown volume reductions than trees in sheltered areas. Within tree canopies, a one-fold increase in inlet wind speed intensified crown compression (approximately 17 % decrease in crown volume), generated 2.1-fold pressure gradients and increased turbulence kinetic energy by approximately 60 %. Moreover, the entire scenario of the adaptation of experimental trees to wind perturbations was visually restored using digital twin techniques, serving as an integral behaviour dataset for further data-driven decision-making. In summary, this paper presents a comprehensive methodology that can decipher the phenotypic manifestations of trees' reactions to wind hazards, with potential applications in phenotyping or envirotyping studies designed to evaluate the wind resistance properties of rubber trees.

Improving thermal cracking and fatigue cracking performance of hard asphalt binders with bio-renewable additives

Traditional hard asphalt, due to its low cost and excellent mechanical properties, is considered a favorable material for resisting permanent deformation under high-temperature conditions. However, its limited stress relaxation ability at medium and low temperatures significantly impairs its capacity to meet the cracking resistance requirements. To address the limitation, this study synthesized three green and sustainable bio-renewable additives derived from high oleic rapeseed oil. These additives aimed to improve the performance of hard asphalt at medium- and low-temperature conditions, thereby broadening its potential for application in green and low-carbon construction practices. Bending Beam Rheometer (BBR) tests were conducted to determine the critical low-temperature difference (ΔTc) to evaluate the thermal cracking resistance of bio-modified hard asphalt. The effects of the bio-additives on fatigue cracking resistance of hard asphalt were investigated using rheological indices, crossover frequencies, Glover-Rowe (G-R) parameters, and Linear Amplitude Sweep (LAS) tests. The results indicated that bio-additives effectively alleviated the stress in hard asphalt and reduced the asphalt’s susceptibility to thermal cracking by improving the flexibility and stress relaxation of the hard asphalt at low temperatures. Furthermore, the bio-additives substantially improved the ductility and toughness of hard asphalt at intermediate temperatures by lowering its strain sensitivity and increasing its fatigue cracking resistance. Additionally, the high oleic rapeseed oil-based derivatives notably reduced hard asphalt binder’s cracking induced by aging. Among the three bio-additives, acrylated epoxidized high oleic rapeseed oil (AEHORO) and epoxidized high oleic rapeseed oil (EHORO) were noticed to exhibit the most significant improvements in thermal cracking resistance and anti-aging properties, demonstrating superior load-bearing capacity at low temperatures. Overall, the developed bio-additives significantly improved both the thermal cracking and fatigue damage resistance of traditional hard asphalt, thus expanding its applications in pavements for various regions.

Experimental Study on Fire Resistance of Geopolymer High-Performance Concrete Prefabricated Stairs

Geopolymer-based high-performance concrete (GHPC) stairs have been proposed as an alternative solution that fulfills both lightweight and load-bearing requirements for prefabricated stairs. Nevertheless, the fire resistance properties of GHPC stairs remain uncertain. Therefore, this study first conducts high-temperature experimental research on GHPC test blocks. The experimental results demonstrated that the GHPC test blocks exhibited no signs of bursting at elevated temperatures and displayed less degradation in the compressive strength compared to that of ordinary concrete. Subsequently, GHPC-Z stair specimens with ribbed and unribbed configurations were fabricated to conduct a fire resistance test at elevated temperatures, followed by a comparative analysis of the resulting damage. The test results indicate that both types of GHPC stairs demonstrate exceptional performance without exhibiting bursting or noticeable cracks or structural spalling marks on their main bodies, despite experiencing vertical deformation. Furthermore, based on these findings, finite element models were established to simulate the fire-induced damage in GHPC and ordinary concrete stairs without ribbed folding plates. The simulation results illustrate that GHPC stairs possess commendable fire resistance capabilities along with an ability to effectively recover from high-temperature damage.

Chitosan/sodium alginate/ethyl cellulose-based multilayer film incorporated with l-ascorbic acid for improved barrier, mechanical, and antioxidant properties

A bioactive multilayer film (ML) loaded with l-Ascorbic acid (AA) was developed using chitosan (CH), sodium alginate (SA), and ethyl cellulose (EC). Various properties of the films, including morphological, hydrophobic, barrier, mechanical, optical, and antioxidant characteristics, were evaluated and compared to those of monolayer films made from each biopolymer. The cross-sectional analysis via scanning electron microscopy revealed the successful preparation of the ML film with layering of the different biopolymers. For the ML film the resulting water contact angle was observed with an average of 73.86° and the film showed water resistant properties as compared to the individual CH and SA films. The ML film showed the lowest water vapor transmission rate (WVTR) at 54.99 g·d−1·m−2 as compared to the individual films. Moreover, the ML film had the highest tensile strength at 0.56 MPa as compared to the mono-layer films including CH, SA, and EC with TS values of 0.33, 0.24 and 0.17 MPa, respectively. Furthermore, the AA-loaded ML film exhibited significantly higher DPPH scavenging activity at 66.20 %. These findings suggest that the ML film, due to its superior barrier, mechanical, and antioxidant properties has the potential for the applications in active food packaging.

Evaluating the Flexural Strength and Charpy Impact Strength Of CAD/CAM And Compressed Molded PMMA Dentures: An In Vitro Study

PMMA (Polymethyl methacrylate) is a wide range of polymers are commonly used for various applications in prosthodontics. And the embedding of tooth specimens for research purposes. The unique properties of PMMA, such as its low density, aesthetics, cost-effectiveness, ease of manipulation, and tailorable physical and mechanical properties, make it a suitable and popular biomaterial for these dental applications. These complete dentures can be manufactured using two techniques: (i) conventional compression molding (CCM) technique and (ii) CAD/CAM technology. The objective of this study was to evaluate the mechanical properties of CAD/CAM PMMA denture compared to compressed molded PMMA, manufactured using the CCM technique and CAD/CAM technology. The study consisted of twenty samples, divided into two groups based on their manufacturing technique (conventional and CAD/CAM), with five samples assigned to each test. The mechanical properties of the samples were tested using flexural strength, and Charpy impact strength tests after immersing the samples in artificial saliva at 37°C for one week. The results showed that using different manufacturing techniques for PMMA CDs leads to differences in measured characteristics that affect their suitability as the only available treatment for edentulous patients. However, a statistical analysis using SSPS tools showed that the differences are not significant between the CCM technique and CAD/CAM technology. Despite the lack of statistical significance, The PMMA CDs manufactured using the CAD/CAM technology route are recommended due to their better mechanical resistance properties.

АНАЛИЗ ПРОДУКТИВНОСТИ РАЗЛИЧНЫХ ПО ПРОДОЛЖИТЕЛЬНОСТИ ВЕГЕТАЦИОННОГО ПЕРИОДА ГИБРИДОВ КУКУРУЗЫ ООО «ОТБОР» В ПОЧВЕННО-КЛИМАТИЧЕСКИХ УСЛОВИЯХ РЕСПУБЛИКИ ТАТАРСТАН

The research was carried out on gray forest heavy loamy soils of the Ancestral region of the Republic of Tatarstan in order to identify the productivity and adaptability of hybrids of LLC "Selection" to local conditions. Thirteen hybrids of different growing season duration were sown: ultra-early – Severina, Bertha, Vidora, Sugar early Delicacy 121; early-ripening - Cool-175, Agatha, Spring-179, Spring–180, Cool-185, Darina; medium-early - Spring-279, Diana and Sugar Alina. The technology of corn cultivation was generally accepted for the Republic of Tatarstan. Background fertilizer N16P16K16 was applied for pre-sowing cultivation. Hybrids were evaluated according to the realization of feed and grain potential in the conditions of the Republic of Tatarstan. During the years of research, the studied hybrids showed inherent genetic properties of drought resistance in relation to stressful weather and climatic conditions. The hybrids Rodnik-180 (189.0 cm), Severina (173.7 cm), Agate (173.0 cm) had the highest plant height in the phase of milk ripeness. The highest aboveground mass was observed in hybrids Rodnik-292 (63.88 t/ha), Severina (58.25 t/ha). The largest leaf apparatus was formed in the phase of milk ripeness by hybrids: Diana (47.48 thousand m2/ha) and Rodnik-292 (47.42 thousand m2/ha), which in the conditions of the Republic of Tatarstan can be cultivated for fodder purposes to obtain juicy green feed. The highest grain yield was obtained from an early-maturing hybrid of Darin, which had the highest indicators of the mass of cobs (241.3 g), the mass of grain from the cob (187.5 g), the mass of 1000 grains (391.5 g) As a result, a yield was formed, almost twice the planned value (192.6% or 9.63 t/ha). Also, high grain yields were obtained by growing ultra-early hybrids of Severin (7.49 t/ha) and Bertha (7.35 t/ha).