Abstract
The use of irrigation has expanded and favored agricultural productivity in recent years. The mapping through remote sensing has contributed to the monitoring of irrigated areas. In this sense, the objective of this study was to evaluate the central pivotal evolution in terms of location by municipalities, micro basins, soils and slope in the Goian tributary watershed of the Araguaia River State of Goiás. Data were available between 2000 and 2016. Irrigated areas were surveyed through the database available in the Geographical Information System of the State of Goiás (SGEI). The vector and raster data were manipulated using the Qgis v software. 2.18.26 (QGIS Development, 2019). The pivots were counted through the statistical function of the software. From the shape SGEI available in the soil map of classes is generated by categorizes tion of soil types. The declivity map was generated from raster files acquired through the Brazilian Geo morphological Database (INPE, 2017). The slope classes (%) were extracted with slope tool. There is an increase of more than 95% in the number of pivots and irrigated area between the years 2000 and 2016. The central pivots are more concentrated in the central region of the Red and Red-Light basins. The highest concentration of central pivots occurred in the municipality of Jussara. The pivots are located predominantly in an Oxisol area with a slope of 3 to 13%.
Highlights
The expansion of irrigation and better management of existing water supplies can contribute to the increase of food production, playing an increasingly important role in agricultural production (Christofidis, 2013; Darko et al, 2015)
From the table of attributes and the spatial position with the map otto basins of Goiás made available by (SGEI, 2019) carried out by the Superintendence of Geology and Mining-SIC, it was identified the basin of the Araguaia River and the microbasins that composed of the tributary s was performed the cut of the study area
The survey carried out through the vector files in the SGEI database indicated that between 2000 and 2016, there was a significant increase in the number of pivots installed in the region, as well as in the irrigated areas (Figure 2A and 2B)
Summary
The expansion of irrigation and better management of existing water supplies can contribute to the increase of food production, playing an increasingly important role in agricultural production (Christofidis, 2013; Darko et al, 2015). Geographic information systems (GIS) and remote sensing are important tools for the monitoring of irrigated agriculture with central pivot (Christofidis, 2013). The use of satellite images can help identify irrigated areas, especially with central pivot systems because these areas are identified through visual analysis of the images because they are circular in shape (Ferreira et al, 2011). The mapping of irrigated areas by central pivot is presented as an alternative to fill information deficiencies in relation to agriculture (Ferreira et al, 2011). The objective of this study was to evaluate the central pivotal evolution regarding the location by municipalities, microbasins, soils and slope in the basin of the Araguaia River, Goiás state
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