Navegar
Submissões Recentes
Agora exibindo 1 - 5 de 142
- DissertaçãoAtividade nematicida de extratos de Brugmansia suaveolens sobre Meloidogyne incognita(Universidade Estadual do Norte do Paraná, 2026) Venâncio, Stéphany de Campos; Alves, Viviane Sandra; https://orcid.org/0000-0003-2381-8115; http://lattes.cnpq.br/3794580975938452; Alves, Viviane Sandra; https://orcid.org/0000-0003-2381-8115; http://lattes.cnpq.br/3794580975938452; Poletto, Rodrigo de Souza; https://orcid.org/0000-0002-7034-7865; http://lattes.cnpq.br/8774064317309922; Silva, Santino Aleandro da; https://orcid.org/0000-0002-1019-1926; http://lattes.cnpq.br/8341476195396585Meloidogyne incognita stands out as one of the most aggressive and widely distributed species in tropical regions, causing severe damage to plant root systems. The need for alternatives to synthetic nematicides drives research into plant-based compounds with biological potential and lower environmental impact. In this context, the present study aimed to evaluate the nematicidal activity of aqueous and hydroalcoholic extracts from leaves and flowers of Brugmansia suaveolens (Solanaceae) on second-stage juveniles (J2) of M. incognita. The experiments were conducted under controlled laboratory conditions, using J2 obtained from infected tomato roots, processed with sodium hypochlorite solution and filtered through 250 and 500 mesh sieves. The suspensions containing J2 were exposed to two types of extracts (aqueous and hydroalcoholic) at different concentrations, and a negative control was performed with distilled water. The mortality of the juveniles was evaluated after 24 hours of exposure, and the data obtained were submitted to analysis of variance and Tukey's test (p<0.05). The aqueous extracts caused higher mortality of M. incognita J2, with the flower extract causing up to 98% mortality in all concentrations evaluated and showing no significant difference. The aqueous leaf extract, on the other hand, showed dose-dependent mortality, with values varying according to the dose tested. For the hydroalcoholic extracts, mortality was observed in the extracts obtained from flowers and leaves, with values ranging from 46 to 59% mortality. Analysis by gas chromatography coupled with mass spectrometry (GC-MS) for the detection and identification of volatile chemical constituents present in B. suaveolens extracts confirmed significant differences between the extracts, both in terms of the extraction method and the part of the plant used.
- DissertaçãoInfluência do condicionador de solos nos atributos químicos, microbiológico e produtividade do milho segunda safra(Universidade Estadual do Norte do Paraná, 2026) Costa, Eduardo Almeida da; Silva, Marcos Augusto Alves da; https://orcid.org/0000-0002-5570-8677; http://lattes.cnpq.br/4973981237909142; Nicolosi, Mateus Marrafon; http://lattes.cnpq.br/5740779198324583; Kölln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; http://lattes.cnpq.br/8041626078120100; Osipe, Jethro Barros; https://orcid.org/0000-0001-6453-3090; http://lattes.cnpq.br/9692340257207288; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449Soil conditioners play a fundamental role in modern agriculture, as they contribute to improved plant development and promote enhancements in soil microbiota, favoring a more balanced and active rhizosphere. In this context, the present study aimed to evaluate the efficiency of peat- and humic acid-based soil conditioners on soil microbiology and chemistry, as well as on the phytochemical parameters of corn (Zea mays L.). The experiment was conducted in a randomized complete block design (RCBD) with four replications. The treatments were as follows: T1 – Control; T2 – Methylobacterium symbioticum; T3 – 100 kg ha⁻¹ of granulated conditioner + M. symbioticum; T4 – 200 kg ha⁻¹ of granulated conditioner + M. symbioticum; T5 – 300 kg ha⁻¹ of granulated conditioner + M. symbioticum; T6 – 100 kg ha⁻¹ of powdered conditioner + M. symbioticum; T7 – 200 kg ha⁻¹ of powdered conditioner + M. symbioticum; T8 – 300 kg ha⁻¹ of powdered conditioner + M. symbioticum; T9 – 100 kg ha⁻¹ of powdered conditioner enriched with Trichoderma asperellum + M. symbioticum; T10 – 200 kg ha⁻¹ of powdered conditioner enriched with T. asperellum + M. symbioticum; and T11 – 300 kg ha⁻¹ of powdered conditioner enriched with T. asperellum + M. symbioticum. In the control treatment, 300 kg ha⁻¹ of urea was applied, while in the treatments containing M. symbioticum, there was a 30% reduction in the urea dose. The following parameters were evaluated: plant height, shoot dry mass (SDM), root dry mass (RDM), microbiological attributes, soil chemical analysis, thousand-grain weight (TGW), and final yield (kg ha⁻¹). It was observed that treatment T11, with 300 kg ha⁻¹ of powdered conditioner + Methylobacterium symbioticum, showed an increase of 1,190.4 kg ha⁻¹ compared to the control. Furthermore, all treatments with soil conditioners promoted improvements in soil microbiological attributes. Therefore, it can be concluded that soil conditioners play an important role, and the best treatment among those evaluated was the one containing powdered soil conditioner enriched with Trichoderma asperellum + Methylobacterium symbioticum.
- DissertaçãoTerbutilazina na entressafra: período de segurança pré-semeadura e seletividade para soja em solos de textura contrastantes(Universidade Estadual do Norte do Paraná, 2026) Osipi, Carlos Botelho Pereira; Osipe, Jethro Barros; https://orcid.org/0000-0001-6453-3090; http://lattes.cnpq.br/9692340257207288; Kölln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; http://lattes.cnpq.br/8041626078120100; Osipe, Jethro Barros; https://orcid.org/0000-0001-6453-3090; http://lattes.cnpq.br/9692340257207288; Gustavo, Dário; https://orcid.org/0000-0002-4648-6881; http://lattes.cnpq.br/5682942731827088; Dias, Roque de Carvalho; https://orcid.org/0000-0001-5433-5373; http://lattes.cnpq.br/5490315867189084Chemical weed control during the off-season allows interventions when weeds are still at earlier growth stages and broadens the range of available herbicide modes of action, which supports herbicide rotation. However, this practice also raises concerns about residual activity on the succeeding crop and the potential risk of crop injury. Terbuthylazine has emerged as a potential alternative to atrazine. Understanding its behavior in soils with contrasting textures, as well as its potential to injure currently used soybean cultivars, is essential for establishing safe recommendations. This study aimed to: (i) determine the minimum interval required between terbuthylazine application and soybean sowing in sandy- and clay-textured soils; and (ii) identify differences in soybean cultivar sensitivity to terbuthylazine. To address objective (i), two field experiments were conducted in Assis, São Paulo State, Brazil (sandy Oxisol, 15% clay) and Bandeirantes, Paraná State, Brazil (clayey Rhodic Eutrudox, 60% clay), using terbuthylazine rates of 0.6 and 0.8 kg a.i. ha⁻¹ applied at 48, 36, 24, 12, and 0 days before soybean sowing (cultivar NK 6630). For objective (ii), the sensitivity of five soybean cultivars was evaluated under greenhouse conditions based on crop injury, chlorophyll content (SPAD index), fresh mass, and dry mass. In the sandy soil, the minimum safe interval was 32 days for both herbicide rates. In the clayey soil, no effect on yield was observed, regardless of rate or application timing. Genotypic variability in cultivar response was observed: NK 6630 was the most sensitive material, showing greater crop injury and lower SPAD values, whereas Monsoy 6601 was the most tolerant, with lower levels of crop injury.
- DissertaçãoEfeitos da aplicação de microrganismo eficiente sobre crescimento, produção e qualidade de frutos de Solanum Lycopersicum L.(Universidade Estadual do Norte do Paraná, 2026) Silva, Leandro de Oliveira; Kölln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; http://lattes.cnpq.br/8041626078120100; Porto, Petrônio Pinheiro; https://orcid.org/0000-0002-2999-7612; http://lattes.cnpq.br/1751366795715746; Porto, Petrônio Pinheiro; https://orcid.org/0000-0002-2999-7612; http://lattes.cnpq.br/1751366795715746; Pinto, Fabiana Gisele da Silva; https://orcid.org/0000-0002-0486-8486; http://lattes.cnpq.br/9361463429150328; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449Contemporary agriculture faces increasing challenges related to sustainability, food security, and mitigation of environmental impacts. In this context, the tomato plant (Solanum lycopersicum L.), a vegetable crop of great economic and social relevance, serves as an ideal model for studies on plant-microorganism interactions. The objective of this dissertation was to evaluate the effects of applying effective microorganisms (EMs), particularly in the form of liquid bokashi/Tomita Microorganisms Technology (TMT), on the growth, yield, and fruit quality of tomato plants, also considering their interaction with arbuscular mycorrhizal fungi (AMF). The first article presents a systematic review, conducted according to the PRISMA protocol, which identified 2,450 records and included 31 studies. These studies demonstrate the benefits of the co-inoculation of AMF and EMs, such as increased phosphorus uptake, enhanced biomass accumulation, tolerance to abiotic stresses, suppression of pathogens, and improvements in fruit quality. The second article describes an experiment conducted under controlled conditions, using a completely randomized design (CRD) with seven treatments, in addition to a control, to evaluate different rates and application frequencies of the product associated with NPK 10-10-10 mineral fertilization. Treatments T1 (50 L ha⁻¹), T2 (100 L ha⁻¹), T3 (200 L ha⁻¹), and T7 (400 L ha⁻¹) received a single application, while treatments T4 (50 L ha⁻¹), T5 (100 L ha⁻¹), and T6 (200 L ha⁻¹) received two applications at the same rate. The control received no application of the product. The evaluated variables included vegetative growth parameters (plant height, leaf number, leaf area), fresh and dry biomass accumulation, yield (fruit number and weight), and quality parameters (soluble solids content, firmness, and color). The results demonstrated that split application of TMT promoted a significant increase in plant height (up to 22% compared to the control), leaf area (average increase of 18%), dry biomass accumulation (25% increase), and yield (20% increase in both fruit number and weight). In contrast, single application concentrated effects on vegetative growth, without significant gains in reproductive output. It is concluded that the use of effective microorganisms, associated with mycorrhizal symbiosis, represents a promising strategy to strengthen tomato cultivation in sustainable agricultural systems, reducing the need for synthetic fertilizers and pesticides while reconciling productivity, quality, and environmental conservation in line with the principles of regenerative agriculture.
- DissertaçãoHidróxidos e carbonatos na dinâmica do pH do solo: efeitos na microbiota e no desenvolvimento da cultura da soja(Universidade Estadual do Norte do Paraná, 2026) Silva, Matheus Hashimoto da; Silva, Marcos Augusto Alves da; https://orcid.org/0000-0002-5570-8677; http://lattes.cnpq.br/4973981237909142; Nicolosi, Mateus Marrafon; http://lattes.cnpq.br/5740779198324583; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Dário, Gustavo; https://orcid.org/0000-0002-4648-6881; http://lattes.cnpq.br/5682942731827088; Alves, Karina Aline; https://orcid.org/0000-0002-8916-0224; http://lattes.cnpq.br/6915234182529881In agriculture, soil amendments play a crucial role in supplying nutrients, correcting pH, and promoting a range of vital benefits for healthy plant development. In this context, this study aimed to evaluate the efficiency of pH correction at different soil depths in soybean cultivation, considering the application of amendments composed of calcium and magnesium hydroxides and carbonates, in order to determine the most suitable parameters for the use of these elements. The treatments were organized in a randomized complete block design (RCBD) with four replications, using plots of 2.7 m wide by 5 m long, totaling an area of 13.5 m² per plot. The trial included a total of 14 treatments, organized as follows: control (T1); applications of hydroxides and carbonates, in granular and powder form, at doses corresponding to 50, 100, and 150% of the recommended dose, all associated with the biological mixture (T2 to T13); and a treatment composed only of the biological mixture (T14). The biological mixture was composed of Bacillus amyloliquefaciens, Bacillus subtilis, Bacillus aryabhattai, Trichoderma sp., Bradyrhizobium japonicum, and Azospirillum brasiliense, which were mixed and applied to the soil 31 days after crop emergence. The following variables were considered for evaluation: pH correction in the 0-10, 0-20, and 20-40 cm soil depth layers; changes in calcium, magnesium, and phosphorus levels; root system dry mass (RSM); shoot dry mass (SDM); number of pods per plant (NPP); thousand-grain weight (TGW); final crop yield (bags ha⁻¹); and monitoring of soil microbiological activities. The application of hydroxides resulted in a greater increase in soil pH in both evaluated depth layers compared to the application of carbonates. Forty-five days after the application of the amendments, it was observed that, in the 0–10 cm layer and at the highest dose used (1,428 kg ha⁻¹), the hydroxides raised the soil pH from 4.7 to 5.4, while carbonate, at the same dose, increased it to 4.9. The correction of the soil pH promoted a more favorable environment for the microbiota, increasing biological activity and nutrient availability. The improvement of the chemical and biological components of the soil resulted in greater root development and an increase in the number of pods per plant, culminating in increased soybean crop productivity.