Liming and fertilization to restore degraded Brachiaria decumbens pastures grown on an entisol

Scientia Agricola

Patrícia Perondi Anchão Oliveira²  Antonio Enedi Boaretto¹  Paulo Cesar Ocheuze Trivelin²  Wladecir Salles De Oliveira¹  Moacyr Corsi¹ 

[1] ,USP CENA Lab. de Isótopos Estáveis

关键词: ECC;    lime;    restoration;    base saturation;    acid soils;    PRNT;    calcário;    restauração;    saturação por bases;    solos ácidos;   

DOI  :  10.1590/S0103-90162003000100019

来源: SciELO

【 摘 要 】

The reconstitution of soil fertility is essential in the process of pasture restoring, liming being the first action to be taken in this direction. The liming recommendation for pastures needs more technical information as the application method and rate. A field experiment was carried out to evaluate the liming and fertilization practices to restore a degraded Brachiaria decumbens pasture. The following factors were studied: liming method (incorporated in soil by disking or not); level of base saturation (40, 50 or 80%) and lime type (55, 70 or 90 of ECC). Liming and fertilization (NPK and micronutrients) increased both the forage yield and its root system, these being more evident in the second year, even using the same rates of lime and fertilizer used during the first year. After two years the levels of base saturation aimed for the 0 to 0.20 m soil layer were not achieved, neither was the neutralization of the Al. The disking impaired the development of the root system of B. decumbens and promoted the decrease of soil organic matter. The lime with the lowest ECC increased root growth and led to higher concentrations of Ca and Mg in the soil. Studies in other conditions are necessary to define liming requirements in established and degraded pastures.

【 授权许可】

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