Navegando por Autor "Osipi, Carlos Botelho Pereira"

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    Dissertação
    Terbutilazina 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/5490315867189084
    Chemical 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.