Abstract
The main residue of iron and nickel mining is slag, a solid residue of low solubility and rich in magnesium silicate. A residue with potential use as a soil conditioner, however, it is still necessary to investigate whether its use brings impacts to the environment. Microorganisms are extremely sensitive to environmental changes, changes that can be used as environmental quality indicators. Among the organisms that act as microbiological indicators of soil quality, the activity of arbuscular mycorrhizal fungi stands out. With this, this study aimed to verify the mycorrhizal activity as a quality indicator under application of nickel iron mining slag as soil conditioner. The experiment was carried out in the greenhouses of the agronomy course and in the laboratory of agricultural microbiology of the Evangelical College of Goianésia. Magnesium silicate was supplied by Anglo American Mining Company, located in Barro Alto, Goiás. Agronomic and microbiological analyses were performed at the Evangelical College of Goianésia, Goiás. The experimental design used was completely randomized, arranged with five treatments and with five replications, where the treatments were composed of four doses of magnesium silicate: 9, 12, 15, and 18 g dm-3 of soil in addition to the control without application. Ten golden saw rice seeds were planted in 10-L pots. Soil analysis used in the experiment was performed to determine soil nutritional parameters. The application of iron and nickel mining slag does not influence the development of rice in the first application. The application of 9 dm³g-1 of iron and nickel mining slag soil positively influences mycorrhizal activity on roots and soil. Key words: Mycorrhiza, magnesium silicate, stress, cerrado.
Highlights
The mining industry generates a gigantic amount of solid and liquid waste, which is accumulated and causes great socio-environmental impact
The application of iron and nickel mining slag in order to use it as a soil conditioner did not present a significant minimum difference in the statistics in vegetative parameters such as length, volume, fresh mass and root dry mass (Figure 1) and in the parameters plant height, fresh mass and shoot dry mass (Figure 2)
The dose of 9 g/dm3 showed the highest values of mycorrhizal colonization rate and spore density
Summary
The mining industry generates a gigantic amount of solid and liquid waste, which is accumulated and causes great socio-environmental impact. According to the Brazilian Mineral Yearbook (2019),iron and nickel are among the main ores extracted in Brazil and occupy the range of. 71.1% and 2.5% of metals extracted in the country, respectively, reaching the financial movement of 88.5 billion reais in 2017. The state of Goiás is the third with the highest production of ores in Brazil, surpassed only by Minas.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
