TY - JOUR
T1 - An evaluation of three Thai phosphate rocks for agronomic use based upon their chemical and mineralogical properties
AU - Charanworapan, C.
AU - Suddhiprakarn, A.
AU - Kheoruenromne, I.
AU - Wiriyakitnateekul, W.
AU - Gilkes, Robert
PY - 2013
Y1 - 2013
N2 - Ratchaburi phosphate rock (Rat-PR), Kanchanaburi-PR (Kan-PR), and Roi-Et-PR (Roi-PR) from Thailand, and North Carolina-PR (NCR-PR), were evaluated in the laboratory for agronomic use. NCR-PR consisted mostly of apatite (unit-cell a-value 9.336 Å, c-value 6.889 Å). Rat-PR contained apatite (a-value 9.428 Å and c-value 6.882 Å) and calcite as the main minerals. Kan-PR consisted mostly of apatite (a-value 9.406 Å and c-value 6.888 Å), crandallite, and calcite. Roi-RP consisted mostly of quartz and variscite. Dissolution kinetics of PRs in 2% formic acid (2% FA), 2% citric acid (2% CA), neutral ammonium citrate (NAC), alkaline ammonium citrate (AAC), and deionized (DI)-water were determined. The dissolution rate of phosphate from PRs in 2%FA, 2%CA, NAC, and DI-water was NCR-PR > Rat-PR > Kan-PR > Roi-PR. As Roi-PR is very poorly soluble, it is clearly unsuitable for direct application to soil. © 2013 Japanese Society of Soil Science and Plant Nutrition.
AB - Ratchaburi phosphate rock (Rat-PR), Kanchanaburi-PR (Kan-PR), and Roi-Et-PR (Roi-PR) from Thailand, and North Carolina-PR (NCR-PR), were evaluated in the laboratory for agronomic use. NCR-PR consisted mostly of apatite (unit-cell a-value 9.336 Å, c-value 6.889 Å). Rat-PR contained apatite (a-value 9.428 Å and c-value 6.882 Å) and calcite as the main minerals. Kan-PR consisted mostly of apatite (a-value 9.406 Å and c-value 6.888 Å), crandallite, and calcite. Roi-RP consisted mostly of quartz and variscite. Dissolution kinetics of PRs in 2% formic acid (2% FA), 2% citric acid (2% CA), neutral ammonium citrate (NAC), alkaline ammonium citrate (AAC), and deionized (DI)-water were determined. The dissolution rate of phosphate from PRs in 2%FA, 2%CA, NAC, and DI-water was NCR-PR > Rat-PR > Kan-PR > Roi-PR. As Roi-PR is very poorly soluble, it is clearly unsuitable for direct application to soil. © 2013 Japanese Society of Soil Science and Plant Nutrition.
U2 - 10.1080/00380768.2013.810546
DO - 10.1080/00380768.2013.810546
M3 - Article
SN - 0038-0768
VL - 59
SP - 522
EP - 534
JO - Soil Science and Plant Nutrition
JF - Soil Science and Plant Nutrition
IS - 4
ER -