POTASSIUM FERTILIZATION OF SOYBEAN, PEARL MILLET, AND COTTON IN A NO-TILL ROTATION SYSTEM IN THE CERRADO REGION

• Autor(a) principal: Bernardi, Alberto Carlos de Campos
• Data de Publicação: 2009
• Outros Autores: Oliveira Júnior, Juarez Patrício de, Leandro, Wilson Mozena, Mesquita, Tiago Gomes da Silva, Carvalho, Maria da Conceição Santana, Freitas, Pedro Luiz de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Tropical (Online)
• Texto Completo: https://revistas.ufg.br/pat/article/view/3519
• topic: Glycine max; Pennisetum; Gossypium hirsutum; fiber quality; agronomic efficiency; Glycine max; Pennisetum; Gossypium hirsutum; qualidade da fibra; eficiência agronômica

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 (17o51’S, 50o18’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 K2O, 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 K2O rate. Results showed that the best cotton agronomic efficiency was obtained with 146 kg ha-1 of K2O, supplied before sowing. Results also showed positive effects of potassium fertilization on cotton fiber quality.   KEY-WORDS: Glycine max; Pennisetum; Gossypium hirsutum; fiber quality; agronomic efficiency.