Chenopodium Album Research Articles

The potato vine crusher: a new tool for harvest weed seed control

Harvest weed seed control (HWSC), an evolving strategy in weed management, is highly effective for the control of a variety of weed species in North American cropping systems. Previous devices for weed seed devitalization at harvest have been limited to tow behind and integrated combine systems. The potato vine crusher (PVC) is a harvester-mounted set of rollers originally designed for crushing and control of Ostrinia nubilalis (Hübner) larvae during potato ( Solanum tuberosum L.) harvest. To evaluate the potential of the PVC for HWSC, we conducted stationary testing of spring tension and roller speed settings to maximize devitalization of lambsquarters ( Chenopodium album L.), the most problematic weed species in Canadian potato production. In addition, we evaluated the efficacy of the PVC for the devitalization of several pernicious weed species under controlled conditions and during a simulated harvest. Increasing PVC spring tension reduced the devitalization of lambsquarters seed, whereas roller speed had minimal effect. In contrast, maximized spring tension and minimized roller speed reduced lambsquarters emergence (53%) in soil. Hypocotyl and radicle elongation was observed from lambsquarters seed fragments under controlled conditions, potentially contributing to increased control in soil through fatal germination. High levels of seed devitalization (65%–94%) were observed for all species under controlled conditions. During simulated harvest, control of large weed seeds (50%–63%) was observed, whereas smaller seeds were not impacted, signifying the importance of seed size for PVC efficacy. These studies demonstrate the PVC as a promising new tool for HWSC in Canadian potato production systems.

Phytochemical Studies, Anti-Oxidant and Anti- Inflammatory Properties of Four Medicinal Plants

Rheumatoid arthritis, a chronic autoimmune disorder, is characterized by polyarthralgia and joint dysfunction resulting from autoimmune responses that target self-neoepitopes. These attacks lead to the activation of macrophages and other defense cells. By identifying these self-epitopes as biomarkers in RA, researchers have gained valuable insights into the disease’s pathogenesis. Over the years, research has focused on investigating the potential of medicinal plants as antiinflammatory agents. In this study, a hydroethanolic extract of Saraca asoca, Ficus benghalensis, Chenopodium album, and Nyctanthes arbor-tristis leaves was prepared by Soxhlet apparatus. Various concentrations of extracts were utilized to assess phytochemical analysis, GC-MS, in-vitro anti-oxidant, and anti-inflammatory activities. The highest scavenging potential was exhibited by Chenopodium album, as assessed by the DPPH assay (90.32 ± 3.2 %) and H2O2 (86.00 ± 1.94 %). Similarly, the Nyctanthes arbor-tristis showed (92.23 ± 0.83 %) inhibition in membrane stabilization assay, and (91.49 ± 1.03 %) in protein denaturation inhibition capacity. GCMS analysis showed various phytoconstituents in extracts. In order to confirm its therapeutic potential for treating RA, Nyctanthes arbor-tristis may be a better drug candidate that needs to be further researched for mechanistic studies.

New library of pyrimido[5,4-e][1,2,4]triazolo[1,5-c]pyrimidine derivatives: Synthesis, herbicidal activity, and molecular docking study

The development of nitrogen-containing heterocyclic compounds with novel structure and remarkable biological activity is always in demand. Herein, new library of pyrimido[5,4-e][1,2,4]triazolo[1,5-c]pyrimidine derivatives (1–98) was designed, synthesized, and characterized by Fourier Transform Infrared Spectoscopy (FT-IR), nuclear magnetic resonance (1H NMR), carbon-13 nuclear magnetic resonance (13C NMR), high-resolution mass spectroscopy (HRMS), and X-ray single-crystal diffraction. Their herbicidal activities were screened for the first time by Petri dish assay and pot experiment in a glasshouse. The results indicated that some of title compounds (e.g.,1, 4, 5, and 7–11) exhibited 100 % inhibition rate against the roots and stalks of Cucumis sativus, Raphanus sativus, Sorghum bicolor and Echinochloa crusgalli at a dosage of 100 mg/L, higher than the positive control Flumetsulam, a well-known commercial acetolactate synthase (ALS) inhibiting herbicide. 2-((2,4-Dichlorophenoxy)methyl)-10-(methylthio)-8-(pentylthio)-5-propyl-5,6-dihydropyri- mido[5,4-e][1,2,4]triazolo[1,5-c]pyrimidine 7 showed notable postemergence herbicidal activity against Abutilon theophrasti, Amaranthus spinosus, Chenopodium album, Digitaria sanguinalis, Echinochloa crusgalli, and Setaria viridis at a rate of 375 g/ha, and its activities were similar to the positive control Flumetsulam. Enzymatic bioassays revealed that 7, 8, and 40 displayed good inhibitory potency against ALS with 39.6 %, 39.1 %, and 40.9 % inhibition rate, respectively, comparable to that of Flumetsulam (43.5 % inhibition rate). Moreover, molecular docking analysis was conducted by using ALS protein and target ligand molecule 7. The results of molecular docking were consistent with the bioassay experiments, showing compound 7 with a new structure and excellent herbicidal potency was potent inhibitors of ALS.

Genbesøg på Bjørnkær

Genbesøg på Bjørnkær

Evaluation of the Impact of Herbicidal Weed Management Practices on Weed Density, Yield Attributes and Yield of Irrigated Chickpea (Cicer arietinum L.)

In the Rabi season of 2021-22, an experiment was conducted at the Agronomy Research Farm of CCS Haryana Agricultural University in Hisar. The aim was to examine how herbicidal weed management affects irrigated chickpea. The experiment was laid out in Randomised Block Design (RBD) with thirteen treatments, each repeated three times. The treatments included various herbicides applied at different stages, such as pre-plant incorporation (PPI), pre-emergence (PRE), and post-emergence (POE). Interestingly, the Ready mix (RM) herbicide application of pendimethalin + imazethapyr (RM) @ 1000 g a.i ha-1, applied both as PPI and PRE, outperformed the herbicides applied solely as PPI, PRE, or POE. Among the herbicidal treatments, the combined during PPI and PRE stages exhibited excellent control over a diverse weed population, leading to a significant increase in chickpea yield compared to the weedy check. The number of seeds per pod, pods per plant, and branches per plant varied significantly with different weed control treatments. Weed-free plots showed the highest values in these parameters. The uncontrolled growth of weeds in the weedy check resulted in a 55.2% reduction in seed yield as compared to weed-free plots. The maximum seed yield (1968 kg ha-1) and favorable yield attributes were observed in the weed- free treatment, statistically comparable to the yield obtained from two hand weeding at 30 and 50 days after sowing (1940 kg ha-1). Among herbicidal treatments, the highest seed yield was achieved with the PRE application of pendimethalin + imazethapyr (RM) @ 1000 g a.i. ha-1 (1827 kg ha-1). The dominant weed flora consisted of Chenopodium album, Fumaria parviflora and Anagallis arvensis. Density of different weed species was significantly influenced by different weed control treatments. All the weed control treatments significantly reduced the total weed density and dry matter accumulation by weeds in comparison to weedy check. Weed free and two hand hoeing reduced the weed population drastically which was statistically at par with PRE application of pendimethalin + imazethapyr (RM) at 1000 g a.i. ha-1. Chenopodium album, Fumaria parviflora and Anagallis arvensis were effectively controlled by RM irrespective of its time of application.

Antibacterial and Antifungal Activity of Chenopodium album L.

Antibacterial and Antifungal Activity of Chenopodium album L.

Allelopathy and arbuscular mycorrhizal fungi interactions shape plant invasion outcomes

The novel weapon hypothesis suggests that allelopathy is an important mechanism for exotic plants to successfully invade native plant communities. Allelochemicals from exotic plants affect both native plants and arbuscular mycorrhizal fungi (AMF) in soil. To explore these effects, we conducted pot experiments using a native plant community comprising of Chenopodium album L., Vitex negundo L., Rhus chinensis Mill., and Acer truncatum Bunge. We incorporated AMF strains (Funneliformis mosseae, Glomus versiforme, and Rhizophagus intraradices in a 1:1:1 volume ratio) into a soil mixture comprising equal volumes of autoclaved field soil and grass ash at five concentrations (0 g L–1, CK; 10 g L–1, LRE; 20 g L–1, NRE; 30 g L–1, MRE; and 40 g L–1, HRE) to investigate the allelopathy of Rhus typhina L. root and its interactions with AMF on the native plant community. Our results indicated that low concentrations of allelochemicals promoted the relative growth rate and leaf nitrogen content in the native plant community, which was attributed to the increased environmental stress that improved the degree of leaf photosynthetic capacity and organic synthesis rate in the native communities. Moreover, allelochemicals with toxicity decreased the colonization rates of AMF. Meanwhile, the presence of allelopathic effects induced a decrease in leaf nitrogen, and allelopathy altered the effects of AMF on the native community. Specifically, the high concentration of allelochemicals altered the positive effect of AMF on the total aboveground biomass of the native plant community to a negative effect, likely by decreasing colonization rates or affecting soil physicochemical properties and the composition of the mycorrhizal communities. Consequently, it is necessary to consider the effects of AMF when testing the roles of allelopathy or the novel weapons hypothesis in biological invasions. Graphical abstract

Estimation of efficiency of metribuzin to weeds control in coriander crops

There are no chemicals in Russia to protect vegetative coriander from a complex of dicotyledonous and monocotyledonous weeds. The expediency of using metribuzin for this purpose was assessed. Field small-plot trials with herbicide Zenkor Ultra SC (metribuzin, 600 g/l) were carried out in three agricultural territories with differing climatic conditions: Krasnodar, Omsk and Astrakhan Regions. Weed counts were using the quantitative and weight method. The efficiency of herbicide was calculated to the control without treatment. As a result of trials, three groups of weeds were identified: 1) species highly sensitive to herbicide: Chenopodium album L., Amaranthus retroflexus L., Salsola tragus L. (efficiency 90-95%); 2) species medium sensitivity: Solanum nigrum L., Polygonum aviculare L. (efficiency 50-65%); 3) poorly controlled weeds: Ambrosia artemisiifolia L., Galium aparine L. (efficiency less 30-40%). Increases yield of seeds of coriander variety Yantar after Zenkor Ultra SC use amounted to 26.1-37.3%. Phytotoxicity was noted on varieties Ranniy and Santo in one of the years and this needs future estimation sensitivity of varieties to metribuzin.

Green synthesis of ZnO nano-crystals using Chenopodium album L. Leaf extract, their characterizations and antibacterial activities

We present an effective, simple and eco-friendly method for the green synthesis of ZnO nano-crystals. An aqueous extract of Chenopodium album leaf was used as a biological reducing agent for the fabrication of ZnO nano-crystals from the zinc sulphate heptahydrate. The as-prepared and annealed powder samples were characterized using advanced techniques. The results confirmed the presence of ZnO crystals with a broad size distribution, whose crystallinity was noticed to improve substantially after the annealing. Further, in antibacterial activity test of ZnO nano-crystals performed on Escherichia coli and Staphylococcus aureus microorganisms, inhibitory effect was found to increase with concentration. Compared to Gram-positive bacteria, ZnO nano-crystals showed more resistance to Gram-negative bacteria. This green synthesis route of ZnO nano-crystals is novel and aims to reduce the use of toxic chemicals in fabricating the nanoparticles of functional oxides, which have a wide range of potential applications in general and biomedical science, in particular.

ALLELOPATIC INFLUENCE OF WEEDS ON THE GERMINATION OF WINTER WHEAT SEEDS

The article summarizes the results of the phytotoxic effect of water-soluble extracts from various weeds on the germination processes of winter wheat seeds. Competitive relations between plant organisms begin with chemical interaction. Therefore, the competitive properties of the participants of the cenosis and the level of productivity of its components will depend on the starting conditions that are formed during the germination of the seeds of the crop. The research was carried out in the laboratory of plant physiology of VNAU. The purpose of the research was to establish in laboratory conditions the allelopathic effect of water extracts from the most common weeds of the Vinnytsia region: Convolvulus arvensis L., Sonchus arvensis L., Cirsium arvense L., Erigeron canadensis L., Matricaria perforata Merat, Capsella bursa pastoris, Erodium cicutarium L., Chenopodium album L., Galium aparine L., Stellaria media L. Water extracts from the stems, leaves and root system of weeds were prepared at a concentration of 1:10. During the experiment, it was established that the presence of allelopathically active substances of all experimental weed species of this concentration negatively affects the germination energy of winter wheat seeds. In the control version, all the seeds of the culture germinated on the 4th day, and in the experimental versions, 1-3% of the wheat seeds were in the swelling phase. Water extractions of different types of weeds had different inhibitory effects on winter wheat seed germination and subsequent growth of the root system and sprout stems. The negative effect of water-soluble secretions from Erodium cicutarium L., Cirsium arvense L. and Sonchus arvensis L. reduced the height of wheat seedlings by 5.8-4.0%. And the length of the root system of the culture was smaller by 5.7, respectively; 5.8 and 5% compared to the control variant. Water-soluble extracts from Stellaria media L. and Matricaria perforata Merat. had the least influence on the growth processes of winter wheat. The difference in sprout height from the control variant was 1.3% and 2.0%, respectively. The length of the germinal root of wheat was shorter by 1.8% and 3.8% under the influence of water-soluble secretions of asteraceae and chamomile. The total length of the root system of winter wheat was inhibited by them by 2.4% and 2.6%, respectively, in relation to the control. The results of the conducted research provide justification for the appearance of unfriendly seedlings and the lag in the growth of winter wheat plants on weedy areas.

Evaluation of Antioxidant and Anti-Inflammatory Activities, and Metabolite Profiling of Selected Medicinal Plants of Nepal

This study aimed to evaluate the antioxidant, antiarthritic, and anti-inflammatory properties of extracts from the leaves of twelve different medicinal plants in Nepal. We then evaluated the total phenolic, flavonoid, and tannin contents of the extract using in-vitro assays and characterized it using GC-MS analysis. Results revealed that most of the leaf extracts contained phenolic compounds, flavonoids, tannins, alkaloids, and saponins. Few plants also showed the presence of glycosides, phytate, and vitamin C. Among the studied plants, Neolamarckia cadamba exhibited the highest total phenolic and tannin contents, as 241.53 ± 0.20 µg of gallic acid equivalent/mg and 74.48 ± 1.081 µg of tannic acid equivalent/mg, respectively. Ipomoea batatas exhibited the highest total flavonoid content, as 53.051 ± 1.11 µg of quercetin equivalent/mg. Moreover, Raphanus sativus demonstrated significant ferrous ion chelating, 2,2-diphenyl-1-picrylhydrazyl, hydrogen peroxide scavenging, and total antioxidant activities with IC50 value of 4.76 ± 0.68 µg/mL, 5.84 ± 0.14 µg/mL, 6.89 ± 0.16 µg/mL, and 8.99 ± 0.20 µg/mL, respectively. Similarly, Colocasia esculenta and Cicer arietinum exhibited the highest hydroxyl radical and nitric oxide scavenging activities, measuring IC50 value of 7.22 ± 0.56 µg/mL and 9.06 ± 0.10 µg/mL, respectively. Among all the extracts, Amorphophallus paeoniifolius displayed significant human red blood cell (HRBC) membrane stabilization activity (IC50 = 6.22 ± 0.78 µg/mL). Furthermore, Raphanus sativus, Chenopodium album, Cicer arietinum, and Murraya koenigii exhibited the highest inhibitory activities against protein denaturation with bovine serum albumin, antiarthritic, lipoxygenase inhibitory, and proteinase inhibitory, measuring IC50 of 7.48 ± 0.48 µg/mL, 9.44 ± 1.62 µg/mL, 14.67 ± 1.94 µg/mL, and 28.57 ± 2.39 µg/mL, respectively. In conclusion, this study demonstrated the twelve leaf extracts’ significant antioxidant, antiarthritic, and anti-inflammatory activities.

Evaluation of Growth Performance and Economic Return Analysis of Bathua (Chenopodium album) Genotypes

Evaluation of Growth Performance and Economic Return Analysis of Bathua (Chenopodium album) Genotypes

Potential Seed Dispersal by Persian Wild Ass in South Central Iran

Seed dispersal plays a pivotal role in plant ecology, impacting various aspects such as dispersal, reproduction, and population dynamics. In this study, we investigated the endozoochoric seed dispersal by the onager or Persian wild ass (Equus hemionus onager) in Qatrouiyeh National Park, located in south-central Iran. Fecal samples were collected from three plains within the park over three seed production seasons. A subsequent greenhouse experiment was conducted to identify and quantify the germinated seedlings. We discovered a total of 63 plant species across 45 genera and 21 families, with the majority of species categorized as annual or perennial forbs. Seasonal variations were observed for seedling count, species richness, and species diversity, with peak values observed during autumn. The seedlings consisted primarily of forbs (86%), followed by grasses (10%) and other plant types (4%). Astragalus podolobus, Lepidium vesicarium, and Chenopodium album emerged as the most abundant species from the fecal samples. Our findings shed light on the critical role played by the onager in the dispersal of numerous plant species and emphasized the potential cascading effects of herbivore-mediated seed dispersal. This highlights the significance of conserving and restoring the remaining populations of this threatened subspecies in arid habitats, where seed dispersal by abiotic factors is limited.

Chenopodium album: its nutritional value and use

The article discusses the use of the weed Chenopodium album (lambsquarters). Its nutritional value, active substances, and recipes for dishes from this plant are given. This allows considering Chenopodium album (lambsquarters) from the perspective of a functional additive in culinary recipes.

Chenopodium ucrainicum (Amaranthaceae), a new ‘BB’ genome diploid species: karyological, cytological, and molecular evidence

Abstract In 2020, S. Mosyakin and B. Mandák described a new species from the Chenopodium album aggregate, C. ucrainicum. The description of the species was based mainly on its distinct morphological characters. This study aims to improve our understanding of C. ucrainicum by combining karyological, cytological, molecular, and distribution information. All analyses demonstrated that C. ucrainicum is closely related to C. ficifolium and C. suecicum, the species with the ‘BB’ subgenome. It has the same diploid number of chromosomes (2n = 2x = 18), has very similar genome size (mean ± SD, 1.865 ± 0.026 pg), and is included in the same haplogroup together with polyploid species with the subgenome combination ‘BBDD’. Nevertheless, the haplotype of C. ucrainicum is unique and is not shared with any known closely related species, indicating that the species is very well delimited from other related taxa. A similar result was obtained by RAD-seq data. This finding is particularly significant because species with the ‘BB’ genome played an integral part in the evolution of several allopolyploid taxa, some of which are widespread weeds (C. album s.s., C. berlandieri) or economically important species (C. quinoa). Morphologically, the closest species remains C. suecicum, which is, however, very well genetically differentiated.

Bio-efficacy of metsulfuron methyl and carfentrazone ethyl against weed spectrum in wheat (Triticum aestivum L.)

A field experiment was conducted during the winter (rabi) season of 2016–17 and 2017–18 at the Chandra Shekhar Azad University of Agriculture and Technology Kanpur, Uttar Pradesh, to evaluate bio-efficacy and phytotoxicity of metsulfuron methyl 10% + carfentrazone ethyl 40% against weed flora in irrigated wheat crop (Triticum aestivum L). Major dominant weeds that infested the crop were lamb’s quarters (Chenopodium album L.), scarlet pimpernel (Anagallis arvensis L.) and white sweet clover (Melilotus albus Medik.). The lowest dry weight (g/m2) and weed-control efficacy (WCE) of test weed species were found in treatments T4 (metsulfuron methyl 10% + carfentrazone ethyl 40% @ 100 g/ha), T3 (metsulfuron methyl 10% + carfentrazone ethyl 40% @ 75 g/ha) and T2 (metsulfuron methane 10% + carfentrazone ethyl 40% @ 50 g/ha) respectively. Application of metsulfuron methyl 10% + carfentrazone ethyl 40% at all doses was found to be effective against all the 3 weeds and significantly increased the yield of the main crop. Application of weedicides did not show any phytotoxicity symptoms on the wheat crop in both the seasons and also on the succeeding crop of rice (Oryza sativa L.).

Investigation of antimicrobial and antioxidant activities of Chenopodium album extracts and their effects on gentamicin nephrotoxicity in rats.

This study aims to examine the antimicrobial and antioxidant activities of the aerial parts of Chenopodium album extracts (CAE) prepared with different solvents, and how C. album ethanol extract protects them against gentamicin-induced nephrotoxicity. Extracts of C. album aerial parts were obtained from ethanol, water, methanol, chloroform, and hexane solvents. Thirty-two male Wistar albino rats were used and gentamycin-induced nephrotoxicity was utilized as a model. The water extract of C. album exhibited no antimicrobial effect, whereas the methanol one created the highest zone diameter on Bacillus cereus (26 mm). The methanol extract displayed the highest activity in DPPH and ABTS. The ethanol extract yielded the highest reducing power in the CUPRAC. The water extract had the highest reducing power in the FRAP. Concerning gentamicin-induced renal damage, creatinine and urea levels in the blood were statistically higher in the gentamicin-C. album group compared to the other groups (p < .05). Urea and creatinine levels of the gentamicin-C. album group dropped significantly, indicating that the C. album was effective against renal damage. The sections from kidney tissues in the gentamicin + C. album group mostly exhibited mild glomerular congestion. Hyaline cast, cytoplasmic vacuolization, necrosis, and apoptosis were not observed. Thanks to C. album treatment, the gentamicin + C. album suffered less histopathological damage than the gentamicin group did. The results of the present study suggest that CAE can be used as a supportive treatment in people undergoing treatment for nephrotoxicity.

Impact of chemical weed management in sugar beet ( Beta vulgaris) on productivity, quality and economics

Weeds in sugar beet ( Beta vulgaris L.) can contribute to a significant reduction in the root yield. The species composition of these plants is an important factor influencing the competition with crops. The aim of the 2-year field experiment with mixtures of: phenmedipham + ethofumesate + metamitron + quinmerac; ethofumesate + metamitron + metamitron + + quinmerac + triflusulfuron-methyl; phenmedipham + ethofumesate + metamitron + + quinmerac + triflusulfuron-methyl + clopyralid + lenacil, and phenmedipham + ethofumesate + metamitron + quinmerac + triflusulfuron-methyl + clopyralid applied in split doses, microdoses and Conviso Smart technology was to determine the weed species community composition and effectiveness of weed control strategies. The most common species occurring in both years were: Chenopodium album L., Fallopia convolvulus L., and Geranium pusillum L. The communities had the highest values of biodiversity indices in 2020 and lower values in 2021. There were no statistically significant differences in the herbicidal effectiveness of the tested herbicidal technologies over both years of research and for individual main weed species – 95–99%. The use of all herbicide variants contributed to achieving significantly higher yields than untreated treatments, and contributed to an increase in profitability of cultivation, but this result depended on the selected strategy. The presented herbicide solutions were characterized by direct income at a similar level.

Cross and multiple herbicide resistance across Ukraine

Goal. Identify resistance to herbicides in weed species on the crops of leading agricultural companies in the regions of Ukraine and identify ways to counteract the emergence of resistant weed biotypes.&#x0D; Methods. The research of herbicide effectiveness was carried out in production and vegetation experiments. Control plants were collected on non-arable land. Statistical analysis was performed using StatPlus software from AnalystSoft Inc.&#x0D; Results. Field and greenhouse studies in 2014—2023 identified herbicide resistance in highly damaging biotypes of monocotyledonous and dicotyledonous weed species in Ukraine. In 2022—2023, herbicide-resistant ragweed (Ambrosia artemisiifolia L.) affected sunflower crops, the main crop that ensures the profitability of crop production in the country. Imidazolinone resistance in Ambrosia was identified in 2015. In 2023, multiply resistance to herbicides — acetolactate synthase inhibitors and protoporphyrinogen oxidase inhibitors (ALS+PРO) — was identified in A. artemisiifolia in large areas of sunflower in central and southern Ukraine. In previous years, resistant to the action of herbicides — acetolactate synthase inhibitors of the imidazolinone class ‒ imazapyr and imazamox biotypes of monocot Echinochloa crus-galli var. crus-galli (L.) P. Beauv., and dicot Amaranthus retroflexus L., and Chenopodium album L. have been identified. Cross-resistance to herbicides: monocot to sulfonylurea (nicosulfuron), and triazole pyrimidines (penoxsulam); dicots to sulfonylurea foramsulfuron, iodosulfuron-methyl-sodium, thifensulfuron-methyl, tribenuron-methyl; to sulfonylaminocarbonyl triazolinone derivative — thiencarbazone-methyl; to triazole pyrimidine derivatives — florasulam, and flumetsulam were established. The multiple resistance of Echinochloa crus-galli, Amaranthus retroflexus, and Chenopodium album to herbicides of the classes of glycine derivatives — glyphosate, monocot to graminicide pinoxaden, and dicot species to phenoxy carboxylic derivatives — 2.4-D, benzoic acid — dicamba; triketones — topramezone; diphenyl ethers — aclonifen have not been established. It was shown that herbicide compositions under the influence of the ammonium pool can increase the level of controlling resistant weed biotypes effectiveness. In 2018—2021, in rice crop rotations in the South of Kherson region, the emergence and spread of a cereal multiply resistant (ALS + ACC) species, Eragrostis spp. was detected.&#x0D; Conclusions. The identification of highly harmful resistant Ambrosia artemisiifolia, Echinochloa crus-galli, Amaranthus retroflexus, Chenopodium album, and Eragrostis spp. in the South and Central part of the «grain belt» of Ukraine shows the limited effectiveness of weed control exclusively with herbicides with one mechanism of action and requires a significant revision of the principles of crop rotation formation and methods of weed control in the state to maintain high levels of profitability and productivity of agrophytocenoses. Solving these issues is urgent in order to preserve Ukraine’s potential as one of the guarantors of world food security.

The effect of the basic tillage system on soybean weediness in the right-bank Forest-Steppe of Ukraine

Goal. To improve the system of soybean crops weed control under different methods of tillage.&#x0D; Methods. Field and laboratory experiment, mathematical and statistical method to assess the reliability of the obtained results.&#x0D; Results. The researched species composition of weeds in soybean crops included 12 species of 7 families, with a predominance of dicotyledonous species (80.1—93.3%), regardless of the tillage method the proportion of the monocotyledonous species made up 6.7—19.9%. The following species were most common: Chenopodium album L., Amaranthus retroflexus L., Polygonum lapathifolia L., Galinsoga parviflora Cav., Echinochloa crus-galli (L.) Pal. Beauv. and Setaria glauca (L.) Pal. Beauv. The maximum weediness of soybean crops before herbicides application was observed under the moldboardless main tillage use (to a depth of 10—12 cm) and amounted to 481.5 pcs./m2, of which dicotyledonous species made up 81.7% and monocots — 18.3%. The lowest number of weeds (at the level of 254 pcs./m2) was observed under the No-till technology, the share of dicot species made up 80.1%. With the use of the moldboard tillage in soybean crops before herbicides use, the total number of weeds was 425.5 pcs./ m2, where annual dicotyledonous species predominated (93.3%). Soybean crops subject to herbicides use on the moldboard tillage variant formed a 2.49 t/ha yield, which was 50% higher than that of the weeded control variant. The use of the moldboardless tillage and No-till technology ensured productivity in the range of 2.34—2.40 t/ ha.&#x0D; Conclusions. Regardless of the soil tillage method, dicotyledonous weed species occupied from 80.1 to 93.3% of the soybean crops, with the predominance of Chenopodium album L., the share of which was 66.6—77.3% and Polygonum lapathifoliа L. — 17.6—24.9%. The use of various methods of soil tillage and weed control ensures elimination of weeds at the level of 91.0—91.5% and maintaining productivity in the range of 45—50%.