Navegando por Autor "Dias Junior, Eduardo Siqueira"

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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.