Boron speciation and extractability in temperate and tropical soils: A multi-surface modeling approach

Eynde, Elise Van; Weng, Liping; Comans, R.N.J.

doi:10.1016/j.apgeochem.2020.104797

Cited by 11 publications

(12 citation statements)

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“…It may be suggested, for example, that in soils with pH > 6.5 foliar Zn application may be most appropriate because Zn is consistently more strongly adsorbed as pH rises, while in soils with lower pH applying Zn-containing fertilizers to the soil might be feasible. Furthermore, these findings can be used to identify areas where the use of soil management practices, such as liming and organic matter incorporation, are likely to impact Zn availability in soil and, thereby, affect Zn concentration of staple crops (Manzeke et al, 2019;Wood et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Zinc deficiency is a widespread nutritional disorder affecting ∼ 17 % of the global population and rising to 25 % of the population in countries within sub-Saharan Africa (SSA; Kumssa et al, 2015;Wessells and Brown, 2012). Several interlinked causes contribute to the prevalence of Zn deficiency issues in SSA, including lack of access to animal source foods.…”

Section: Introductionmentioning

confidence: 99%

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The effect of soil properties on zinc lability and solubility in soils of Ethiopia – an isotopic dilution study

Mossa

Gashu

Broadley

et al. 2021

SOIL

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Abstract. Zinc (Zn) deficiency is a widespread nutritional problem in human populations, especially in sub-Saharan Africa (SSA). The Zn concentration of crops consumed depends in part on the Zn status of the soil. Improved understanding of factors controlling the phyto-availability of Zn in soils can contribute to potential agronomic interventions to tackle Zn deficiency, but many soil types in SSA are poorly studied. Soil samples (n=475) were collected from a large part of the Amhara Region of Ethiopia, where there is widespread Zn deficiency. Zinc status was quantified by measuring several fractions, including the pseudo-total (aqua regia digestion; ZnTot), available (DTPA (diethylenetriamine pentaacetate) extractable; ZnDTPA), soluble (dissolved in 0.01 M Ca(NO3); ZnSoln) and isotopically exchangeable Zn, using the enriched stable Zn isotope 70Zn (ZnE). Soil geochemical properties were assessed for their influence on Zn lability and solubility. A parameterized geochemical assemblage model (Windermere Humic Aqueous Model – WHAM) was also employed to predict the solid phase fractionation of Zn in tropical soils rather than using sequential chemical extractions. ZnTot ranged from 14.1 to 291 mg kg−1 (median = 100 mg kg−1), whereas ZnDTPA in the majority of soil samples was less than 0.5 mg kg−1, indicating widespread phyto-available Zn deficiency in these soils. The labile fraction of Zn in soil (ZnE as % ZnTot) was low, with median and mean values of 4.7 % and 8.0 %, respectively. Labile Zn partitioning between the solid and the solution phases of soil was highly pH dependent, where 94 % of the variation in the partitioning coefficient of 70Zn was explained by soil pH. Similarly, 86 % of the variation in ZnSoln was explained by soil pH. Zinc distribution between adsorbed ZnE and ZnSoln was controlled by pH. Notably, Zn isotopic exchangeability increased with soil pH. This contrasts with literature on contaminated and urban soils and may arise from covarying factors, such as contrasting soil clay mineralogy across the pH range of the soils used in the current study. These results could be used to improve agronomic interventions to tackle Zn deficiency in SSA.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of soil properties on zinc lability and solubility in soils of Ethiopia – an isotopic dilution study

Mossa

Gashu

Broadley

et al. 2021

SOIL

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“…In unfertilised situations, B toxicity is rare (Gupta et al, 1985). When fertilising, added B to soils will largely remain in solution as adsorption is limited, especially in acidic soils Van Eynde et al, 2020). As the range between deficient and toxic levels of soil available B is very narrow, this can easily lead to toxicity, especially when large quantities of B are applied (Gupta et al, 139 1985).…”

Section: Discussionmentioning

confidence: 99%

“…Based on Van Eynde et al (2020) and Goldberg (1997), the soil properties considered relevant for B bioavailability were included in the modelling: pH, B-CaCl 2 , B-HNO 3 , B-HW, SOC, Ca-M3 and AlFe-AO. Although multicollinearity was observed among the explanatory soil parameters, no variable selection was made, since all of the variables are potentially relevant for controlling B availability.…”

Section: Soil-plant Relationsmentioning

confidence: 99%

“…Generally, B adsorption on the soil reactive surfaces such as organic matter, iron and aluminium oxides and clay minerals increases with pH and these processes are well described by Goldberg (1997). However, the work of Van Eynde et al (2020) shows that adsorption plays only a minor role in controlling B availability in soils, as most of the reactive B was found in solution. Besides adsorption/desorption processes, atmospheric deposition, weathering of soil minerals and mineralisation of organic matter are believed to be the primary sources of B found in the soil solution (Kot et al, 2016;Park and Schlesinger, 2002), but the relevance of each of these processes may be different depending on the soil system (Van Eynde et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Models for predicting nutrient availability in soils from sub-Saharan Africa

Breure

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Exploring maize grain yield response to boron fertilization in Mollisols: Critical thresholds and predictive models

Barbieri,

Crespo,

Wyngaard

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundThere are no extractable boron (B) thresholds for maize (Zea mays L.) in Mollisols determined by field calibrations.AimsOur objectives were to: (1) explore maize grain yield response to B fertilization, (2) calibrate the soil hot water extractable B (HW‐B) as a predictor of maize response to B fertilization under field conditions, and (3) assess the contribution of clay, pH, and soil organic matter (SOM) as predictive variables of maize response to B fertilization.MethodsWe conducted 53 field trials with 2 treatments: with and without B fertilization. At all sites, we measured clay, SOM, pH, and HW‐B at a 0–20 cm depth.ResultsMaize grain yield ranged from 5.34 to 17.35 Mg ha−1. Grain yield response to fertilization was observed in 6 out of 53 sites (11.3%). In responsive sites, average grain yield response was 1.0 Mg ha−1. Multiple regression models to predict yield response to B addition that included soil, pH, and SOM only explained 19% of the variability. The critical soil HW‐B concentration threshold was 0.78 mg kg−1, correctly diagnosing 79% of the site‐years.ConclusionThe critical threshold for maize B levels resulting from our field study is the first of its kind in Mollisols. This threshold will improve the identification of soils deficient in B.

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Boron speciation and extractability in temperate and tropical soils: A multi-surface modeling approach

Cited by 11 publications

References 94 publications

The effect of soil properties on zinc lability and solubility in soils of Ethiopia – an isotopic dilution study

The effect of soil properties on zinc lability and solubility in soils of Ethiopia – an isotopic dilution study

Models for predicting nutrient availability in soils from sub-Saharan Africa

Exploring maize grain yield response to boron fertilization in Mollisols: Critical thresholds and predictive models

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