Navegando por Autor "Kölln, Oriel Tiago"

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    Eficiência de uso de nitrogênio por genótipos de cana-de-açúcar em ciclo de cana-planta
    (Universidade Estadual do Norte do Paraná, 2025) Dias Junior, Eduardo Siqueira; Rodrigues, Diego Resende; https://orcid.org/0000-0002-9495-8943; https://lattes.cnpq.br/9381400899886153; Kölln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; https://lattes.cnpq.br/8041626078120100; Kölln, Oriel Tiago; Franco, Henrique Coutinho; Silva, Sérgio Ricardo; Dário, Gustavo; Dário, Karina Aline Alves; https://lattes.cnpq.br/8041626078120100; https://lattes.cnpq.br/7632245413046227; https://lattes.cnpq.br/8067599760812752; https://lattes.cnpq.br/5682942731827088; https://lattes.cnpq.br/6915234182529881; https://orcid.org/0000-0002-8507-9808; https://orcid.org/0000-0002-1218-7533; https://orcid.org/0000-0001-6951-8324; https://orcid.org/0000-0002-8916-0224
    Nitrogen (N) is an essential macronutrient involved in fundamental physiological processes throughout the plant life cycle. Given its critical role, high-yield agricultural systems heavily depend on nitrogen fertilizers to ensure global food security. However, excessive N application is associated with significant environmental impacts, highlighting the need to improve nitrogen use efficiency (NUE). Sugarcane (Saccharum spp.), a key crop for bioenergy production and economic sustainability, exhibits high nitrogen demand, necessitating the evaluation of NUE in this system.This study aimed to assess NUE and nitrogen response in first-year sugarcane (plant cane) genotypes under field conditions. The experiment was carried out in a commercial sandy soil area of the Jacarezinho Mill, located in Jacarezinho, Paraná, Brazil. Sixteen sugarcane genotypes were arranged in a randomized block design with four replications. Each plot consisted of four 17-meter-long rows spaced 1.5 m apart, subdivided into two nitrogen treatments: high N (180 kg ha−1) and low N (9 kg ha−1). Planting was performed on August 10, 2023, using stalk segments provided by the mill. Nitrogen status in leaf +1 was evaluated at 180 days after planting (DAP). At harvest (July, 2024), biometric and yield parameters were assessed, including compartmentalized and total dry matter, stalk yield (TCH), and sugar yield (TAH). Additionally, technological analyses—POL (%), fiber (%), total recoverable sugar (TR) (kg t−1), and juice purity (PZA %) were performed in the mill’s laboratory. Nitrogen use efficiency (NUE) and responsiveness varied significantly among the 16 evaluated sugarcane genotypes. RB 127825 outstanding as the most nitrogen-efficient and responsive genotype, clustering with four others in the high-NUE quadrant. The other hand, CTC 9002 and IAC5094 were classified as inefficient and non-responsive, along with six additional genotypes. The remaining genotypes exhibited intermediate perfomed, distributed between inefficient-but-responsive and efficient-but-non-responsive groups. Genotypic differences in NUE were evident based on total dry matter (TDM) and stalk yield (TCH) indices. Clearilly, most variables showed no significant differences (p > 0.05) between high-N (180 kg ha−1) and low-N (9 kg ha−1) treatments within the same genotype, underscoring the predominant influence of genetic factors over nitrogen supply in determining NUE. This finding highlights the importance of genotype selection for optimizing field-level nitrogen management. Leaf nitrogen accumulation at 180 DAP did not differ significantly between nitrogen treatments. Similarly, technological parameters (POL, fiber, TRS, PZA) were unaffected by nitrogen fertilization. However, CTC 9001 and CTC 9002 consistently outperformed other genotypes in technological quality across both N conditions, irrespective of their NUE classification.
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    Uso de Azospirillum brasilense ABV5 e ABV6 e Pseudomonas fluorescens no desenvolvimento inicial de plantas
    (Universidade Estadual do Norte do Paraná, 2025) Edouard, Lovely Santia; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Kölln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; http://lattes.cnpq.br/8041626078120100; Dário, Karina Aline Alves; https://orcid.org/0000-0002-8916-0224; http://lattes.cnpq.br/6915234182529881
    Sustainable agriculture is essential to address challenges related to food security and environmental protection. The use of bioinputs such as Azospirillum brasilense and Pseudomonas fluorescens emerges as a promising alternative to chemical inputs to improve soil fertility and sugarcane crop productivity, while reducing environmental impacts. These microorganisms, often called PGPR (Plant Growth Promoting Rhizobacteria), act through several mechanisms, such as atmospheric nitrogen fixation, nutrient solubilization, and the production of phytohormones that favor root development and increase plant resistance to abiotic stress. The objective of this study was to evaluate the effectiveness of the bioinput based on Azospirillum brasilense and Pseudomonas fluorescens produced in bioreactors in isolated and combined mixtures, in the development of sugarcane. The actions of bioinputs on the germination of soybean and corn seeds and their biocontrol action against phytopathogenic fungi were evaluated. The influence of bioinputs on the soil microbial community and the agronomic parameters of sugarcane were also evaluated. The trial was conducted in a Plant Growth Chamber with controlled temperature, photoperiod and humidity. The use of Azospirillum and Pseudomonas alone did not interfere with germination; however, their combined use had a negative influence on the germination of corn and soybeans. The strains evaluated did not evaluate biocontrol activity. From a microbiological point of view, the study revealed that the application of bioinputs significantly increased the microbial biomass and biological activity of the soil, confirming their role in the regeneration of the soil microbial structure, a key factor in maintaining the fertility and sustainability of agricultural lands. The improvement in microbiological attributes influenced the agronomic parameters, demonstrating greater plant height, greater fresh and dry mass of the aerial part and root. Thus, we can conclude that the bioinputs based on Azospirillum brasilense Abv5 and Abv6 and Pseudomonas fluorescens, collected separately or together, had a positive impact on soil quality, improving both its structure and its capacity to retain essential nutrients for crops.