Zinc buffer capacity of vertisols

Dang, Y. P.; Dalal, Ram C.; Edwards, D. G.; Tiller, K. G.

doi:10.1071/sr9941231

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…Values of b are highest at low [Zn] bss , and thus at high cation exchange capacity (CEC) and pH. Values of b typically range from 2.4 to 571 (Barber, 1995), and for vertisols from 217 to 790 (Dang et al ., 1994). Paramaters õ and α represent plant‐specific transpiration and Zn uptake rates and root morphology.…”

Section: Zinc Fluxes In the Soil–root–shoot Continuummentioning

confidence: 99%

Zinc in plants

White²,

et al. 2007

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Contents Summary 677 Physical and chemical properties of zinc 678 Biochemical properties of zinc 678 Proteins interacting with zinc 678 Zinc fluxes in the soil–root–shoot continuum 679 Zinc in plants 684 Plant responses to elevated soil Zn 686 Acknowledgements 695 References 696 Summary Zinc (Zn) is an essential component of thousands of proteins in plants, although it is toxic in excess. In this review, the dominant fluxes of Zn in the soil–root–shoot continuum are described, including Zn inputs to soils, the plant availability of soluble Zn2+ at the root surface, and plant uptake and accumulation of Zn. Knowledge of these fluxes can inform agronomic and genetic strategies to address the widespread problem of Zn‐limited crop growth. Substantial within‐species genetic variation in Zn composition is being used to alleviate human dietary Zn deficiencies through biofortification. Intriguingly, a meta‐analysis of data from an extensive literature survey indicates that a small proportion of the genetic variation in shoot Zn concentration can be attributed to evolutionary processes whose effects manifest above the family level. Remarkable insights into the evolutionary potential of plants to respond to elevated soil Zn have recently been made through detailed anatomical, physiological, chemical, genetic and molecular characterizations of the brassicaceous Zn hyperaccumulators Thlaspi caerulescens and Arabidopsis halleri.

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Section: Zinc Fluxes In the Soil–root–shoot Continuummentioning

confidence: 99%

Zinc in plants

White²,

et al. 2007

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“…Zinc sorption is known to be strongly pH dependent (Harter 1983;Bar-Tal, Bar-Yosef, and Chen 1988;Stahl and James 1991;Dang et al 1994); soil pH influences not only the amount of Zn sorbed but also the shape of the sorption isotherm (Barrow et al 1981;Harter 1983;Barrow 1986;Msaky and Calvet 1990). In general, the slopes of Zn sorption isotherms at identical equilibrium solution show Zn concentrations increase as pH increases, reflecting an increase in surface affinity for Zn.…”

Section: Introductionmentioning

confidence: 97%

“…Unfortunately, some of the few previous studies on Zn desorption have used acids [e.g., 0.01 M hydrochloric acid (HCl), Harter 1983] or complexing agents [0.005 M diethylenepentaacetic acid (DTPA), Dang et al 1994] to solubilize Zn bound to soil surfaces. Such procedures would seem unlikely to realistically simulate Zn desorption that occurs in soils to replenish solution Zn concentrations following plant uptake or leaching of Zn.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on Zinc Sorption–Desorption by Soils

Singh

McLaren

Cameron

2008

Communications in Soil Science and Plant Analysis

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The objective of this study was to examine the effect of soil pH on zinc (Zn) sorption and desorption for four surface soils from the Canterbury Plains region of New Zealand. Zinc sorption by the soils, adjusted to different pH values, was measured from various initial solution Zn concentrations in the presence of 0.01 M calcium nitrate [Ca(NO 3 ) 2 ]. Zinc desorption isotherms were derived from the cumulative Zn desorbed (mg g 21 soil) after each of 10 desorption periods by sequentially suspending the same soil samples in fresh Zn-free 0.01 M Ca(NO 3 ) 2 . Zinc sorption and desorption varied widely with soil pH. Desorption of both native and added Zn decreased continuously with rising pH and became very low at pH values greater than 6.5. The proportion of sorbed Zn that could be desorbed back into solution decreased substantially as pH increased to more than 5.5. However, there were differences between soils regarding the extent of the hysteresis effect.

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“…where Q is the quantity factor of pesticide (mg kg -1 ), I is the intensity factor of pesticide (mg L -1 ), and b is a constant (Anderson and Christensen 1988;Van Rees et al 1990;Dang et al 1994;Doolittle 2004, 2006;Lee and Ahn 2010).…”

Section: Soilsmentioning

confidence: 99%

Impacts of zerovalent iron application on the adsorption behavior of alachlor and metalaxyl in water and soil systems

2011

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Alachlor and metalaxyl contaminations of environmental and agricultural water and soil systems cause potential threats to human health. However, information on the pesticide adsorption quantity-intensity (Q/I) relationships in water and soil systems is limited. Therefore, adsorption behavior and the fate of alachlor and metalaxyl in the systems as influenced by the application of zerovalent iron (ZVI, Fe 0 ) were investigated using the pesticide adsorption Q/I relationships. After treating ZVI in the systems, the concentration of alachlor rapidly decreased within a few days and then it disappeared at approximately 5-7 experiment days; whereas metalaxyl concentration was reduced by approximately 40-45% during the 28 day experimental period. In particular, ZVI adsorbed more metalaxyl in the aqueous system than in the soil-solution system. The alachlor concentration in the water and soil solution drastically decreased with increasing ZVI treatment, while metalaxyl concentration was relatively slow in its decrease. Adsorption mechanism of the pesticides in the soil-solution system was shown as multiple-site adsorption Q/I fitting. Buffering capacity (BC) of the pesticides increased with ZVI treatment in all sorption sites. The BC values in sandy soil were escalated with increasing ZVI application rates, so that the values were rather higher in sandy soil than in clayey soil. In addition, changes in alachlor concentration with applying ZVI were due to both dechlorination and adsorption; whereas metalaxyl concentration was dependent upon adsorption reaction. Thus, the pesticide adsorption Q/I relationships in different soilsolution systems were critically affected by the ZVI treatment.

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Zinc buffer capacity of vertisols

Cited by 12 publications

References 25 publications

Zinc in plants

Zinc in plants

Effect of pH on Zinc Sorption–Desorption by Soils

Impacts of zerovalent iron application on the adsorption behavior of alachlor and metalaxyl in water and soil systems

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