Data/hora: 29/05/2024 07:56:24

Provedor de dados: | Scientia Agricola
País: | Brazil
Título: | Soil acidity, liming and soybean performance under no-till
Autores: | Caires,Eduardo Fávero; Barth,Gabriel; Garbuio,Fernando José; Churka,Susana.
Data: | 2008-01-01
Ano: | 2008
Palavras-chave: | Glycine max (L.) Merrill; Acidity; Subsoil; Root system; Nutrient.
Resumo: | The effects of soil chemical changes on soybean root growth, mineral nutrition and grain yield, as a result of surface application of lime under no-till (NT), are still under discussion. A field trial was carried out on a loamy dystrophic Typic Hapludox at Ponta Grossa, Paraná State, Brazil, using a completely randomized block design with three replicates, in a split-plot experiment. The main plots received four dolomitic lime rates applied on the surface (0, 2, 4, and 6 Mg ha-1) in July 1993. In the subplots, two dolomitic lime rates were reapplied on the surface (0 and 3 Mg ha-1) in June 2000. After nine years, liming increased pH, exchangeable Ca2+ and reduced exchangeable Al3+ as well as soil Al3+ saturation down to a 60 cm depth. Re-liming, after two years, also provided soil acidity amelioration to a 60 cm depth. Soybean total root length per soil surface area (0-60 cm) decreased with the surface lime application under NT. The reduction in soil exchangeable Al3+ with liming did not change Al concentrations in the soybean roots and leaves. Surface-applied dolomitic lime under NT brought an increase in Ca and Mg concentrations and a decrease in the Mn level in both soybean roots and leaves. Soybean grain yield was not influenced by surface liming because of the decreased Al toxicity and because root growth was stimulated by soil acidity stress under NT.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500013
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162008000500013
Formato: | text/html
Fonte: | Scientia Agricola  v.65 n.5 2008
Fonte: | info:eu-repo/semantics/openAccess