RT Journal Article
T1 Assessment of Potential Nutrient Release from Phosphate Rock and Dolostone for Application in Acid Soils
A1 Rafael, Rogério Borguete Alves
A1 Fernández Marcos, María Luisa
A1 COCCO, Stefania
A1 Ruello, Maria Letizia
A1 Weindorf, David C.
A1 Cardelli, Valeria
A1 CORTI, Giuseppe
K1 Citric acid
K1 Dissolution rate
K1 Leaching solution
K1 Particle-size fraction
K1 Release kinetics
K1 Slow-release fertilizer
AB Finding alternative local sources of plant nutrients is a practical, low-cost, and long-term strategy. In this study, laboratory column experiments were conducted in a completely randomized design to evaluate the feasibility of using phosphate rock and dolostone as fertilizers or acid-neutralizing agents for application in tropical acid soils. The dissolution rates of different particle-size fractions (0.063–0.25, 0.25–0.5, and 0.5–2 mm) of both rocks were studied by citric acid solution at pH 4 and 2 and water, with extraction times of 1, 3, 5, 7, 12, 24, 72, 144, 240, and 360 h. The results showed that the dissolution of both rocks depended on the particle size, leaching solution, and extraction time. The dissolution rate of rock-forming minerals increased as the specific surface area increased, corresponding to a decrease in particle size. In all cases, the release kinetics was characterized by two phases: 1) a first stage of rapid release that lasted 24 h and would ensure short-term nutrient release, and 2) a second stage of slow release after 24 h, representing the long-term nutrient release efficiency. Both rocks were suitable as slow-release fertilizers in strongly acid soils and would ensure the replenishment of P, Ca, and Mg. A combination of fine and medium particle-size fractions should be used to ensure high nutrient-release efficiency. Much work could remain to determine the overall impact of considerable amounts of fresh rocks in soils
PB Elsevier
SN 1002-0160
YR 2018
FD 2018-02
LK http://hdl.handle.net/10347/17629
UL http://hdl.handle.net/10347/17629
LA eng
NO Rafael, R. B. A., Fernández-Marcos, M. L., Cocco, S., Ruello, M. L., Weindorf, D. C., Cardelli, V., and Corti, G. (2018). Assessment of Potential Nutrient Release from Phosphate Rock and Dolostone for Application in Acid Soils. Pedosphere 28, 44-58
NO This is the accepted manuscript of the following article: Rafael, R. B. A., Fernández-Marcos, M. L., Cocco, S.,Ruello, M. L., Weindorf, D. C., Cardelli, V., and Corti, G. (2018). Assessment of Potential Nutrient Releasefrom Phosphate Rock and Dolostone for Application in Acid Soils. Pedosphere 28, 44-58. doi: 10.1016/S1002-0160(17)60437-5
NO This study was mainly supported by the “AppliedResearch and Multi-sectorial Program” (FIAM)(No. 5.2.1) granted by the Italian Cooperation and DevelopmentAgency (ICDA) to the Universidade EduardoMondlane. The authors also acknowledge the PolytechnicUniversity of Marche, Italy for the PhD scholarshipprovided to the first author as well as researchfunding for this work
DS Minerva
RD 27 abr 2026