Solution Ion Activity and Plant Growth

Khasawneh, F. E.

doi:10.2136/sssaj1971.03615995003500030029x

Cited by 72 publications

(33 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many studies have demonstrated that adsorptiondesorption is the most important process affecting the behavior of heavy metals in soils, hence their bioavailability and potential toxicity (Backes et al, 1995). The toxicity and bioavailability of metals also depend on their speciation (Kasawneh, 1971). A variety of factors such as organic acids in soils can affect the metal release from soil and speciation in soil solution (Mench andMartin, 1991, Rieuwerts et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils

2004

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils

2004

View full text Add to dashboard Cite

“…Furthermore, it is thought that metal speciation and ionic activity, rather than the total amount of a dissolved metal, determine plant metal uptake (Kasawneh, 1971). Changes in the dissolved organic carbon (DOC) concentration have a strong impact Chemosphere 50 (2003) [819][820][821][822] www.elsevier.com/locate/chemosphere on the solubility of Cu in soils, with Cu being more soluble at higher DOC levels (Camobreco et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Effects of EDTA and low molecular weight organic acids on soil solution properties of a heavy metal polluted soil

et al. 2003

View full text Add to dashboard Cite

A pot experiment was conducted to study the effects of EDTA and low molecular weight organic acids (LMWOA) on the pH, total organic carbon (TOC) and heavy metals in the soil solution in the rhizosphere of Brassica juncea grown in a paddy soil contaminated with Cu, Zn, Pb and Cd. The results show that EDTA and LMWOA have no effect on the soil solution pH. EDTA addition significantly increased the TOC concentrations in the soil solution. The TOC concentrations in treatments with EDTA were significantly higher than those in treatments with LMWOA. Adding 3 mmol kg À1 EDTA to the soil markedly increased the total concentrations of Cu, Zn, Pb and Cd in the soil solution. Compared to EDTA, LMWOA had a very small effect on the metal concentrations. Total concentrations in the soil solution followed the sequence: EDTA ) citric acid ðCAÞ % oxalic acid ðOAÞ % malic acid (MA) for Cu and Pb; EDTA ) MA ) CA % OA for Zn; and EDTA ) MA ) CA > OA for Cd. The labile concentrations of Cu, Zn, Pb and Cd showed similar trends to the total concentrations.

show abstract

“…Dual ion activity ratios is a useful expression for interactive soil-plant systems (Khasawneh 1971). Ion activity values can account for the possible formation of less bioavailable products made by ion pairing or precipitation.…”

Section: Statistical Analysesmentioning

confidence: 99%

“…Dilution problems can be alleviated using nutrient ratios (Walworth and Sumner 1987). Ion activity ratios could account for nutrient interactions in soil solution during ion uptake by plants (Khasawneh 1971). Nutrient interactions not only refer to the reactions between compounds in the soil solution, but also to cation-anion, anion-anion and cation-cation interactions during plant uptake.…”

mentioning

confidence: 99%

Row-centred log ratios as nutrient indexes for saturated extracts of organic soils

Parent¹,

Cissé²,

Tremblay³

et al. 1997

Can. J. Soil. Sci.

View full text Add to dashboard Cite

G. 1997. Row-centred log ratios as nutrient indexes for saturated extracts of organic soils. Can. J. Soil Sci. 77: 571-578. Composition of soil solution was investigated in the top layer of a Typic Mesisol across seven crop sequences. Each sequence started and ended with carrots (C) and included onions (O), barley (B) and weeded fallow (F) as follows: CCCC, CCBC, CBCC, CCOC, COBC, CBOC and CFFC. The soil showed adequate pH and electrical conductivity values. Soil solution composition was assessed by the saturated soil extraction procedure. The changing levels of nutrients in the saturated soil extracts over seasons, years and crop sequences were analyzed using absolute values of nutrient concentrations, nutrient percentages relative to total soluble salts (the nutrient intensity and balance concept) and row-centred log ratios of nutrient concentrations or activities (compositional data analysis). The row-centred log ratio is the log-transformed ratio of a given element to the geometric mean of soluble elements. Nutrient percentages were highly correlated with row-centred log ratios. The three relative nutrient expressions reduced seasonal variations as compared with raw nutrient concentrations by incorporating component proportions. Concentration of total soluble salts was significantly correlated (P < 0.01) with concentrations of NO 3 -N (r = 0.37), P (r = 0.80), K (r = 0.80), Ca (r = 0.96) and Mg (r = 0.92) in saturated soil extracts. Between-years homoscedasticity as well as reduced skewness and kurtosis for all nutrients were obtained using row-centred log ratios of ion activities. Other advantages of using row-centred log ratios are discussed. . Le rapport logarithmique centré est le logarithme du rapport d'un élément donné à la moyenne géométrique des éléments solubles. La couche arable montrait des valeurs optimales de pH et de conductivité électrique. Les expressions relatives ont réduit la variation saisonnière par rapport aux concentrations en éléments nutritifs car elles tenaient compte des proportions entre les composantes. La concentration en sels solubles totaux montrait une corrélation significative (P < 0.01) avec les concentrations en NO 3 -N (r = 0.37), P (r = 0.80), K (r = 0.80), Ca (r = 0.96) et Mg (r = 0.92). L'homogénéité de la variance annuelle ainsi qu'une asymétrie et un aplatissement réduits ne furent obtenus pour tous les nutriments qu'avec les rapports logarithmiques centrés des activités ioniques. D'autres avantages des rapports logarithmiques sont discutés.

show abstract

Solution Ion Activity and Plant Growth

Cited by 72 publications

References 0 publications

Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils

Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils

Effects of EDTA and low molecular weight organic acids on soil solution properties of a heavy metal polluted soil

Row-centred log ratios as nutrient indexes for saturated extracts of organic soils

Contact Info

Product

Resources

About