Comparison of methods for extracting available phosphorus from soils of the semi-arid

Performance of Mehlich-1 and Mehlich-3 extractors in quantifying phosphorus in soils fertilized with liquid swine manure

“…The availability of P is controlled, mainly, by the partition of its chemical fractions according to their lability in the soil (Larsen, 1967): labile in the form of P-H2O and P-Al, and non-labile in the form of P-Fe and P-Ca (Santos and Conceição, 2018;Pereira et al, 2020). Furthermore, it is known that in soils with a more acidic pH, the P fixation process occurs, preferably, together with the Fe (P-Fe) and Al (P-Al) ions, and, in more alkaline soils, the precipitation, mainly with the Ca ion (P-Ca) (Medeiros et al, 2021). Therefore, soil pH is a determining attribute in the dynamics of the availability of this macronutrient for plants (Gatiboni et al, 2008;Rosa et al, 2018) since acidity influences the load balance of solid soil particles, consequently in the sorption process of this anion together with colloids (Vasconcelos et al, 2022).…”

Phosphorus extractors in soil under no-tillage system with 19 years of swine manure applications

“…In case exist consolidated soil analysis methods, it is important to compare methodologies to keep the soil-plant relationship calibrated according to the nutrients evaluated. For this, studies are carried out using different extraction methods [ 9 , 10 ] and later, the comparison of which method correlates better with the soil-plant relationship, that is, how much of the nutrient available in the soil is absorbed and accumulated in the plant. This procedure allows to evaluate the bioavailability [ 11 ].…”