Abstract
In Brazil, the maize crop has high production volume, and the State of Para has the potential to become major center for grain production. However, it consists of tropical soils, which are acidic and low phosphorus availability. The aims of this study was to evaluate the growth and productivity of maize plants exposed to different rates of phosphorus in typical dystrophic Yellow Latosol in Capitao Poco city, Northeastern Para State, in 2011. In the experimental area, soil correction was performed by liming, increasing the base saturation to 60%. The experimental design was a randomized block with four replicates, in which the treatments were: 0; 45; 90; 135 and 180 kg ha-1 of P2O5 applied at sowing, using triple superphosphate source (46% P2O5). The variables: plant height, stem diameter, number of leaves and number of ears showed a better adjustment of quadratic equation to application of P2O5 in sowing furrow with maximum technical efficiency obtained at rates of 142.1 kg ha-1; 114.62 kg ha-1; 130.59 kg ha-1 and 145 kg ha-1 of P2O5, respectively. The application of 179.87 kg ha-1 of v in corn crop (BR 5102 variety) in a typical dystrophic Yellow Latosol promoted yield of 6.58 t ha-1 of grains under the soil and climatic conditions of Capitao Poco region.
Highlights
In Brazil, the maize crop has high production volume, and the State of Pará has the potential to become major center for grain production
The aims of this study was to evaluate the growth and productivity of maize plants exposed to different rates of phosphorus in typical dystrophic Yellow Latosol in Capitão Poço city, Northeastern Pará State, in 2011
The experimental design was a randomized block with four replicates, in which the treatments were: 0; 45; 90; 135 and 180 kg ha-1 of P2O5 applied at sowing, using triple superphosphate source (46% P2O5)
Summary
Eduardo Cézar Medeiros Saldanha*, Maria Eunice Lima da Rocha, José Leandro Silva de Araújo, José Darlon Nascimento Alves, Daiane de Cinque Mariano e Ricardo Shigueru Okumura. No Brasil, a cultura do milho (Zea mays L.) possui elevada produção, sendo que o Estado do Pará tem potencial para se tornar grande polo produtivo de grãos. O objetivo do trabalho foi avaliar o crescimento e a produtividade de plantas de milho submetidas a diferentes doses de fósforo em Latossolo Amarelo no município de Capitão Poço, Nordeste do Estado do Pará, no ano de 2011. O delineamento experimental foi em blocos casualizados com quatro repetições, sendo os tratamentos empregados: 0; 45; 90; 135 e 180 kg ha-1 de P2O5, aplicados no sulco de semeadura, utilizando a fonte superfosfato triplo (46% de P2O5). A aplicação de 179,87 kg ha-1 de P2O5 na cultura do milho, variedade BR 5102, em Latossolo Amarelo distrófico típico, proporcionou a produtividade de 6,58 t ha-1 de grãos, nas condições edafoclimáticas da região de Capitão Poço. PALAVRAS-CHAVE: Zea mays L., fertilidade do solo, Latossolo Amarelo, Amazônia Oriental
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