Effects of low-molecular-weight organic acids on phosphorus release from phosphate rock

Articles in Press

Document Type : Complete scientific research article

Authors

1 MS Student, Department of Soil Science

2 Faculty of Agriculture, Urmia University

3 Faculty of Agriculture, Gonbad Kavoos University

Abstract

In order to study the effect of low-molecular-weight organic (LMO) acids on phosphate rocks ‎solubility for direct use in agricultural activities, a factorial experiment was conducted at ‎completely randomized design‏ ‏in three replication. LMO acids were acetic, salicylic, malic, oxalic ‎and citric at five concentration levels (0.5, 1, 2, 5 and 10 mM) and a control (no acid), on two ‎phosphate rocks (RP) including igneous of Yazd (RPi) and sedimentary of Yasooj (RPs). Results ‎showed that use of low-molecular-weight organic acids caused to release large amounts of ‎phosphorus from both phosphate rocks. Among organic acids, citric and oxalic were more ‎effective than others. Citric acid increased soluble P from 21 to 487 µg/L in RPi, and oxalic acid ‎increased soluble P from 36 to 400 µg/L in RPs. With increasing concentration of organic acids ‎from 0 to 10 mM, soluble P increased significantly in both phosphate rock. As soluble P increased ‎from 21 to 888 µg/L in RPi and from 36 to 546 µg/L RPs. The sufficiency level of soluble P for ‎most plants (200 µg/L) was found in the 0.5 and 5 mM of LMO acids for RPi and RPs, ‎respectively. It is concluded that the release of phosphate from RP was affected by types and ‎concentrations of organic acids, and composition of RP.‎

Keywords

Journal of Soil Management and Sustainable Production

Articles in Press, Accepted Manuscript
Available Online from 14 September 2020

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