SPECTROPHOTOMETRIC DETERMINATION OF PHOSPHORUS IN ROCKS OF INDUSTRIAL INTEREST

Abstract

The Brazilian terrain presents innumerable nuances in terms of its physical and chemical aspects. Brazilian soils are characterized by a lack of phosphorus, caused by the source material and the interaction of this element with the soil. The low mobility of this nutrient is due to its adsorption to colloidal complexes with non-exchangeable format and, consequently, not available to plants. For these reasons, phosphorus is considered a limiting nutrient in the production of biomass in tropical soils. The search for ways to restore nutritional values in the soil, for different crops, is an objective of researchers and companies in the agricultural field, and a proposal that has already been implemented is the use of adding crushed rock material to the soil that presents deficiency of the elements present in the rock. The work carried out here shows results obtained with a group of rocks with the potential to replace phosphorus in the soil, namely: kimberlite, marl, kamafugite and phonolite.