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Acid soils cover about 30% of the total ice-free land area. Based on this, the study aimed to evaluate soil acidity correction, focusing on identifying studies on limestone recommendations and corrective measures in agricultural systems. To do so, a systematic literature review (SLR) was carried out, composed of: 1) a systematic literature mapping (SLM), which identifies studies using topic-specific keywords and database automatic search; 2) Snowballing, technique that expands the initial selection using references of the selected studies; and 3) a SLR to synthesize the selected papers. First, 169 scientific papers were selected, of which 116 by SLM, 26 by backward Snowballing, and 27 by forward Snowballing. Most of the papers were about lime requirement (LR) methods (43%) and liming effects on soil and plants (19%). A total of 26 LR methods were found in the papers, of which most were base saturation and Shoemaker-McLean-Pratt methods. Calcium and magnesium carbonates, as well as dolomite, were the main sources of soil acidity correction. In brief, the study provided a critical and constructive analysis of the existing literature on soil acidity correction; the findings showed that liming is the most used and effective method to neutralize soil acidity. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • Swine and poultry agroindustry consume a lot of thermal energy in their process. • Eucalyptus woodchip is widely used in Brazil to supply this energy demand. • In the IPF it is possible to have livestock and chip production in the same land. • With a GIS the potential of chip production in IPF in western Paraná was estimated. • 4.24% of the pasture area in IPF supplies the woodchip demand of agroindustry's. Abstract The increase in the world population has caused a rise in the demand for animal protein, particularly that of swine and poultry. Brazil is among the world's largest producers of these two commodities, with the western region of Paraná accounting for a significant fraction of this production. To industrialize this raw material requires a large amount of energy, and much of this demand is supplied by eucalyptus biomass in the form of woodchips originating from distant regions, which increases the cost of production. The Livestock-Forestry Integration (LFI) system, which is encouraged by the national government program of Low Carbon Agriculture (LCA), is a eucalyptus production system that is growing in Brazil. In the Western region of Paraná, there is widespread availability of pasture areas which could be used to produce eucalyptus in this type of system, and meet the biomass demand of agroindustries. The objective of this work was to explore the expansion of eucalyptus plantations under an LFI scenario for agroindustries in Western Paraná, Brazil. In addition to estimating the area with the potential for expansion of agriculture by means of Landsat-8 satellite images, digital elevation models integrated with the Geographic Information System geoprocessing and the software ArcGIS were used. It was found that conversion of 4.24% of the pasture areas into LFI would meet the current demand for woodchips of the agroindustries that slaughter poultry and swine in Western Paraná. Using 8.04% would satisfy the demand until 2025. It was verified that there are 3972.10 km2 available for expansion of agriculture in the region. The methodology used here serves as a reference for future work. [ABSTRACT FROM AUTHOR]