Weathering: Mineral Weathering and Microbial Metabolism

Ullman, William J.; Welch, Susan A.

doi:10.1002/0471263397.env242

Cited by 1 publication

(2 citation statements)

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“…The positive effect of organic acids on mineral dissolution thus can be defined as the sum of the proton-promoted (H) and ligand-promoted (L) effects (Eq. 1) (Ullman and Welch 2002):…”

Section: Introductionmentioning

confidence: 99%

“…The positive effect of organic acids on mineral dissolution thus can be defined as the sum of the proton-promoted ( H ) and ligand-promoted ( L ) effects (Eq. 1 ) (Ullman and Welch 2002 ): where, R t is the release of ions at time t; m and n are empirical exponent constants; k 1 and k 2 are kinetic rate constants for proton- and ligand-promoted dissolution; and aH and aL are activities of proton- and ligand-promoted ion species.…”

Section: Introductionmentioning

confidence: 99%

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Environmentally safe release of plant available potassium and micronutrients from organically amended rock mineral powder

Basak

Sarkar

Naidu

2020

Environ Geochem Health

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The staggering production of rock dusts and quarry by-products of mining activities poses an immense environmental burden that warrants research for value-added recycling of these rock mineral powders (RMP). In this study, an incubation experiment was conducted to determine potassium (K) and micronutrients (Zn, Cu, Fe and Mn) release from a quarry RMP to support plant nutrition. Four different size fractions of the RMP were incubated with organic amendments (cow dung and legume straw) under controlled conditions for 90 days. Samples were collected at different intervals (7, 15, 30, 45, 60 and 90 days) for the analysis of available K and micronutrients in the mineral-OM mixtures and leachates. There was a significant (p \0.05) increase in pH of leachates from the mineral-OM mixtures. The K release was significantly higher from the finer size fraction of RMP. About 18.7% Zn added as RMP was released during the incubation period. Zn release increased from 4.7 to 23.2% as the particle size of RMP decreased. Similarly, Cu release from RMP increased from 2.9 to 21.6%, with a decrease in the particle size. Fe and Mn recovery from RMP recorded 11.2 and 6.6%, respectively. Combined application of OM and RMP showed significantly higher nutrient release than other treatments. This study indicates that effective blending of RMP with organic amendments could be a potential source of K and micronutrients in agriculture without posing a risk of toxic element contamination to the soil.

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“…The positive effect of organic acids on mineral dissolution thus can be defined as the sum of the proton-promoted (H) and ligand-promoted (L) effects (Eq. 1) (Ullman and Welch 2002):…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%