Center pivot irrigation management in maize hybrids and the incidence of stalk rot/Manejo da irrigacao sob pivo central em hibridos de milho e a incidencia de podridao de colmo

Tis study aimed to verify the incidence of Fusarium spp. in commercial maize hybrids and irrigation management strategies utilizing center pivot systems. The experiment was carried out during the second season in a randomized block design with a split-plot arrangement with five maize hybrids (2B810,...

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Published in:Revista brasileira de engenharia agrícola e ambiental 2020-12, Vol.24 (12), p.840
Main Authors: Kuhn, Irineu E, Cotrim, Mayara F, Gava, Ricardo, Alvarez, Rita de C.F, Oliveira, Job T. de, Teodoro, Paulo E
Format: Article
Language:English
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Summary:Tis study aimed to verify the incidence of Fusarium spp. in commercial maize hybrids and irrigation management strategies utilizing center pivot systems. The experiment was carried out during the second season in a randomized block design with a split-plot arrangement with five maize hybrids (2B810, MG580, AS1633, DKB290, and AG8544). The plots were irrigated with five frequencies (1, 2, 3, 4, and 5 days) in one experiment, and five water depths (at 25, 50, 75, 100, and 125% of crop evapotranspiration) in another experiment. Plant height, ear insertion height, moisture at harvest time, yield, and incidence of stalk rot were evaluated. Neither irrigation frequency nor irrigation depth influenced the incidence of disease. The one-day irrigation frequency provided the highest yield for maize hybrids. Hybrid 2B810 showed the highest yield and the lowest incidence of the disease. Key words: Zea mays, fungal disease, precision irrigation Este estudo foi realizado com o objetivo de avaliar a incidencia de Fusarium spp. em hibridos comerciais de milho e manejos de irrigacao por pivo central em segunda safra. O experimento foi conduzido em delineamento de blocos casualizados em esquema de parcelas subdivididas, sendo as parcelas constituidas pelos manejos de irrigacao com cinco frequencias (1, 2, 3, 4, 5 dias, primeiro experimento) e cinco laminas d'agua (25, 50, 75, 100 e 125% da evapotranspiracao da cultura) e as subparcelas com cinco hibridos de milho (2B810, MG580, AS1633, DKB290 e AG8544), em quatro repeticoes. Foram avaliadas altura de planta, altura de insercao de espigas, umidade no momento da colheita, produtividade e incidencia de podridao no colmo. Tanto as a frequencias de irrigacao como as laminas de irrigacao nao influenciaram a incidencia da doenca. A frequencia de irrigacao de um dia proporcionou o maior rendimento de hibridos de milho. O hibrido 2B810 apresentou o maior rendimento e a menor incidencia da doenca. Palavras-chave: Zea mays, doenca fungica, irrigacao de precisao
ISSN:1415-4366
1807-1929
DOI:10.1590/1807-1929/agriambi.v24n12p840-846