Surface Application of Lime for Crop Grain Production Under a No‐Till System

Abstract

The effectiveness of surface application of lime to soils under a no‐till (NT) system, particularly with regard to subsoil acidity, is uncertain, and long‐term data is needed to determine optimum surface liming rates in this cropping system. A field experiment was performed in the period from 1993 through 2003 in Paraná State, Brazil, on a loamy, kaolinitic, thermic Typic Hapludox to evaluate the extent of the downward movement of surface‐applied lime in a NT system, and the effect on grain yields under crop rotation. The treatments consisted of dolomitic limestone at the rates of 0, 2, 4, and 6 t ha−1, calculated to raise the base saturation in the topsoil (0–20 cm) to 50, 70, and 90%. Surface‐applied lime under NT was effective in alleviating soil acidity below the point of placement, and increased the cumulative grain yield of the crops. The effects of surface liming on all three acidity‐related variables (pH, Al, and basic cations) were significant at 0‐ to 5‐ and 5‐ to 10‐cm depths from 1 yr onward, and also at the 10‐ to 20‐cm depth from 2.5 yr onward, remaining consistent for a period of up to 10 yr after liming. The maximum economic yield was obtained at 4 t ha−1 of limestone, showing that the lime rate estimated by the soil base saturation method at 70% in the 0‐ to 20‐cm depth was appropriate for surface liming recommendation in a NT system.

Atributos químicos do solo associados à produtividade do trigo em um talhão com diferentes potenciais produtivos

“…No quadro 4, é apresentada a simulação dos resultados dos quadros 2 e 3 por média da camada de 0,0-0,2 m. Pelo menor esforço amostral e pela economia com as análises, a amostragem de 0,0-0,2 m torna-se racional, e, mesmo com menor amplitude, ainda assim (Caires et al, 2005;.…”

Surface application of gypsum in low acidic Oxisol under no-till cropping system

“…To control soil acidity in NT, lime is broadcasted on the soil surface without incorporation. Because surface liming is more effective in controlling acidity only at the soil most superficial layers (Ernani et al, 2004;Caires et al, 2005), management strategies have been developed to reduce acidity in the subsoil.…”

Atributos químicos de um Latossolo de cerrado sob plantio direto, de acordo com doses e formas de aplicação de calcário

“…O conhecimento da dinâmica da correção da acidez a partir da superfície do solo no SPD, ao longo do tempo, é necessário para que possam ser estabelecidos ajustes na recomendação de calagem (doses e freqüência) (Amaral & Anghinoni, 2001;Caires et al, 2005).…”