Doses e formas de aplicação da adubação potássica na rotação soja, milheto e algodão em sistema plantio direto
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Data
2009-06-18
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Editor
Universidade Federal de Goiás
Resumo
The main objective of this study was to evaluate the
efficiency of potassium fertilizer application, as related to rate,
placement (in-row, broadcast, and split topdress) and time (before
sowing, at sowing, and topdressing), in a soybean, pearl millet,
and cotton no-till rotation system, in a typic dystrophic Red
Latosol (Hapludox), in Turvelândia, Goiás State, Brazil (17o
51’S,
50o
18’W). The experimental design was a factorial randomized
block, with 4 replications. Potassium source was KCl. Potassium
was applied to soybean (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, and
180 kg ha-1 of K2O) in the planting row or broadcasted before
sowing, at sowing, or topdressed. For cotton, the K rates were 0
kg ha-1, 60 kg ha-1, 120 kg ha-1, and 240 kg ha-1 of K2
O, applied
before sowing and placed in the planting row, with none or one
topdressing, or split in two applications. The pre-planting cotton
K was applied in the pearl millet. There was no effect of potassium
fertilization on soybean yield. As a cover crop, pearl millet used,
more efficiently, the 60 kg ha-1 of K2
O rate. Results showed that
the best cotton agronomic efficiency was obtained with 146 kg
ha-1 of K2
O, supplied before sowing. Results also showed positive
effects of potassium fertilization on cotton fiber quality.
Descrição
Palavras-chave
Glycine max, Pennisetum, Gossypium hirsutum, Qualidade da fibra, Eficiência agronômica, Fiber quality, Agronomic efficiency
Citação
BERNARDI, Alberto Carlos de Campos ; OLIVEIRA JÚNIOR, Juarez Patrício de; LEANDRO, Wilson Mozena ; MESQUITA, Tiago Gomes da Silva; CARVALHO, Pedro Luiz de; FREITAS, Maria da Conceição Santana. Doses e formas de aplicação da adubação potássica na rotação soja, milheto e algodão em sistema plantio direto. Pesquisa Agropecuária Tropical, Goiânia, v. 39, n. 2, p. 158–167, abr./jun. 2009. Disponível em: https://revistas.ufg.br/pat/article/view/3519. Acesso em: 10 out. 2022.