Elementos químicos em solução em solos dessaturados e de texturas arenosa e muito argilosa

Abstract

Silicon (Si) is a substantial element in the terrestrial layer considered the second most abundant component when evaluating the weight variable; it is also considered a beneficial element for plants, especially grasses. The response of the plants is intrinsically related to the concentration in the soil solution, which is defined as the reservoir where most of the chemical reactions occur. Therefore, the study of soil composition and relations with the solid phase can elucidate the reactions that command the activity and concentration of ions in the solution. Thus, the main focus of this work is to evaluate the concentration of the element Si in the solution of Cerrado soils in the Municipality regions of Uberaba and Uberlândia, MG, in two different textural classes, due to the dissolution of the quartz minerals present in the sand fraction: (i) sandy and (ii) very clayey. The collection of samples was carried out in four different areas with soils within the two textures, in two seasons: in the dry period and in the rainy season. The soils with higher levels of fine sand showed the solution more buffered with Si, maintaining its higher concentration in relation to the more clayey soils. KEYWORDS: Sandy soils, very clayey soils, silicon, solubility, quartz.