Abstract
The steel residues application (SR) in sandy soils, under a proper handling management, can result in a benefits range, among which, the soil acidity correction. This study investigated the gralunometric composition of three slags and one exhaustion powder from a steel mill, in the municipality of Marabá-PA, in addition to the ability of soil pH correction. To identify the granulometric fractions were used number 8, 10, 16 and 18 mesh sieves. The pH correction experiment were made in factorial scheme, evaluated 3 doses of each RS (1.5 t ha-1, 2.0 t ha-1 and 2.5 t ha-1) in vases with Neosol, for 60 days. Residues from the steel refining (EAFS, LDS and EAFD) showed a particle size predominantly under 1.00 mm, and promoted pH values above to 7.0. The blast furnace slag obtained domain of particle sizes > 2.00 mm, with 77% of the material retained in the sieves, and their soil disposition promoted similar results to dolomitic limestone, used traditionally to pH correction in acid soils, representing an alternative in soil preparation. Others residues also showed the soil pH correction capacity, although the used dosages proved to be above the ideal, with values above 7 and alkalinity tendency. The necessity of an investigation of EAFS, LDS and EAFD residues dosage are essential to pH soil correction, in order to condition the soil to pH ranges considered ideals (6-6.5).
Highlights
The soil is considered one of the main bases of agricultural production (Jenny, 1980; Silva et al, 2018), among with the management techniques introduced by the man and the investment capital of agricultural sector (Reichardt & Timm, 2016)
Its formation is closely related to the combined number of physical, chemical and biological factors, followed by the climate actions that interact and tend towards equilibrium (Lal & Stewart, 2019)
In Brazil, sandy texture soils have the denomination of light or dry soils (Schaetzl & Thompson, 2015), with an 8% predominance in the Brazilian territory, with distribution in the Cerrado biome, on the MAPITOBA region, which cover the states of Maranhão, Tocantins, Piauí and Bahia (Lumbreras et al, 2015; Bolfe et al, 2016), under dominance of Quartzarenic Neosols and small portions of Latosols and Argisols (Donagemma et al, 2016)
Summary
The soil is considered one of the main bases of agricultural production (Jenny, 1980; Silva et al, 2018), among with the management techniques introduced by the man and the investment capital of agricultural sector (Reichardt & Timm, 2016). Its noticed a wide soils variety under distinct physical-chemical particularities (Brevik & Hartemink, 2010), highlighted the fertility and their granulometries (Araújo et al, 2012). Cerrado soils are highly weathered, of high depth and good drainage, but of precarious natural fertility (Fryrear, 1990; Lopes & Guilherme, 2016; Centeno et al, 2017; Gomes et al, 2019). The sandy fraction can represent up to 70% of the composition and its granulometry variated between 0.05 and 2.00 mm (Santos et al, 2019), resulting in high permeability, an important property when observing the groundwater contamination risks (Benghalia et al, 2015)
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