Potencial da escória silicatada na correção da acidez do solo em plantio direto / Slag potential in soil acidity correction under no-tillage

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The soil acidity correction under no-tillage systems is a barrier to be beaten in agriculture. The slag, 6,8 times more soluble than lime, could, because of its better solubility, dislocate in deeper soil layers and correct soil acidity there. This work had as objectives to evaluate the mobility in the soil layers of slag in a comparison with lime under no-tillage and to verify the influence of both of them on corn and wheat yield and to assess the leaf diseases severity of corn. This experiment was installed on a 20 years old no-tillage area. It was carried out in a randomized block design, with 4 blocks and 3 treatments, consisted of slag and lime application and a control without application. Correctives mobility evaluation was made with a subplot of the treatments in soil layers and dates. The slag was more efficient than lime in increasing pH and Ca2+ concentration and reducing Al3+ concentration in soil layers. Besides the promotion of improvement in soil attributes related to acidity faster than lime, slag improved significantly pH at the 15 to 20 cm soil layer at 180 days after the products application. Lime was efficient in improve pH only at no more than the 10 to 15 cm layer, even 360 days after the products application. The corn and wheat yield was not influenced by the soil acidity correction, neither by the corrective used. The silicon application by the slag did not reduce the leaf diseases severity in corn. Slag is more efficient to correct soil acidity in deep soil layers than lime under no-tillage.

ASSUNTO(S)

escória siderúrgica plantio direto acidity correction correção da acidez tillage manejo e conservacao do solo siderurgy slag

ACESSO AO ARTIGO

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