Influence of soil type and natural Zn chelates on flax response, tensile properties and soil Zn availability

2016

Span. j. agric. res.

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Throughout the world, flax (Linum usitatissimum L.) is often grown in Zn-deficient soils, but appropriate fertilizer management can optimize both crop yield and micronutrient content. A greenhouse experiment was conducted on Typic Haploxeralf (pH 6.1) and Typic Calcixerept (pH 8.1) soils to study the relative efficiency of chelated Zn using two application rates of three different Zn sources [Zn-EDDHSA, ethylenediamine-di-(2-hydroxy-5-sulfophenylacetate of Zn); Zn-HEDTA, N-2-hydroxyethyl-ethylenediaminetriacetate of Zn; and Zn-EDTA, ethylenediaminetetraacetate of Zn]. Dry matter /DM) yield, Zn concentration, chlorophyll content, crude fiber and tensile properties were monitored and the soil-Zn status (available-Zn, Zn-fractions and total-Zn) was assessed. Zinc chelate applications increased the most labile forms of Zn in soils and Zn concentrations in plants. The low rate of Zn generally had a beneficial effect on DM yield and tensile properties. The exception was Zn-EDTA in the weakly acidic soil, where the highest Zn concentrations were observed in leaves and whole shoots; this coincided with the largest concentrations of labile Zn in soil. The most efficient fertilizers were Zn-EDDHSA (in both soils) and Zn-EDTA (in the calcareous soil). The relatively large amounts of labile and available Zn present in both of the soils fertilized with Zn-EDTA points to the applying this chelate at lower rate than 5 mg Zn/kg; this should, in turn, reduce the cost of Zn fertilization and minimize environmental pollution risk.

Section: Methodsmentioning

confidence: 99%

Section: Soil Analysismentioning

confidence: 99%

Section: Plant Analysismentioning

confidence: 99%

“…According to Alvarez (2010), when the natural chelate sources applied produce high concentrations of available Zn in soils, this could cause reductions in the tensile properties of flax.…”

mentioning

confidence: 99%

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Effects of synthetic Zn chelates on flax response and soil Zn status

2016

Span. j. agric. res.

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“…Before growing the flax crop, these soils were treated with aqueous suspensions of three natural chelates: Zn-aminolignosulfonate (Zn-AML), Znpolyhydroxyphenylcarboxylate (Zn-PHP) and Znethylenediamine disuccinate (Zn-EDDS). These chelates were applied at different rates: 0, 5 and 10 mg Zn/kg (Alvarez 2010). The soil from the pots was homogenized, and the pots were then placed in a greenhouse for six months.…”

Section: Methodsmentioning

confidence: 99%

The influence of moisture on the residual effects of natural zinc chelates applied to two different soils

J. Soil Sci. Plant Nutr.

2013

The aim of this study was to compare the behavior of residual Zn from three natural chelates (Zn-aminolignosulfonate [Zn-AML],Zn-polyhydroxyphenylcarboxylate [Zn-PHP] and Zn-ethylenediamine disuccinate [Zn-EDDS]) applied at different rates (0, 5 and 10 mg Zn/kg soil) to a flax crop grown during the previous year. This incubation experiment was carried out over 75 days under two different moisture conditions (60% field capacity and waterlogged) in two different soils (acidic [Soil acid ]and calcareous [Soil calc ]). The potential available Zn concentration and shortterm available Zn were estimated under both moisture conditions using the diethylenetriaminepentaacetic acidtriethanolamine (DTPA-TEA) and low-molecular-weight organic acids (LMWOAs) methods, respectively. Watersoluble Zn was estimated in both soils under 60% field capacity conditions. Immediately available Zn (the Zn concentration in the soil solution) was estimated under waterlogged conditions. The pH and Eh were also determined in both soils. Incubation of both soils under both moisture conditions led to decreases in the potential available Zn and short-term available Zn concentrations. Water-soluble Zn concentrations in soils under 60% field conditions, immediately available Zn in soils and the Eh parameter under waterlogged conditions also decreased with time. The residual effect of Zn-AML applied at a rate of 10 mg Zn/kg in Soil acid produced the highest available and short-term Zn concentrations, and the residual effect of Zn-EDDS produced the highest short-term Zn concentration in Soil calc .

Residual effects of organic Zn fertilizers applied before the previous crop on Zn availability and Zn uptake by flax (Linum usitatissium)

Z. Pflanzenernähr. Bodenk.

2013

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The objective of this study was to compare the residual effect of zinc (Zn) from three Zn chelates (Zn-aminelignosulfonate, Zn-AML; Zn-polyhydroxyphenylcarboxylate, Zn-PHP; and Zn-ethylenediaminedisuccinate, Zn-EDDS), applied at two rates (5 and 10 mg Zn [kg soil] -1 , respectively) to a previous crop, for a flax crop (Linum usitatissimum L.). For the greenhouse experiment, two different soils were used: a weakly acidic soil, classified as Typic Haploxeralf (Soil acid ), and a calcareous soil, classified as Typic Calcixerept (Soil calc ). Plant availability of soil Zn was evaluated using the DTPA-triethanolamine (TEA), Mehlich 3, and low-molecular-weight organic acids (LMWOAs) methods. Easily leachable Zn was determined, and soil Zn status was characterized based on the Zn distribution in different fractions obtained by a sequential extraction. The Zn reserves after the previous crop were substantial and ranged from 2.85% to 5.61% of available Zn (Mehlich 3-extractable) with respect to the applied Zn. Plant parameters such as dry-matter yield, total Zn, and soluble Zn concentrations were measured, and Zn utilization by plants was calculated. In both soils, the highest concentrations of available Zn were associated with the application of Zn-AML at a rate of 10 mg Zn kg -1 . In Soil acid the largest quantity of easily leachable Zn was also observed with Zn-AML fertilizer. Similarly, Zn-AML resulted in the highest Zn concentration in flax seeds (229 mg Zn kg -1 and 72 mg Zn kg -1 for the highest rate of Zn application to Soil acid and Soil calc , respectively). The results suggest that these Zn chelates resulted in a residual effect in soils with appropriate concentrations of the most labile fractions of Zn and available Zn, particularly when Zn-AML was applied at the highest rate. This chelate was more effective in Soil acid than in Soil calc . In the weakly acidic soil at the lowest Zn level it was associated with the highest percentage of Zn utilization by the flax plant and the most effective Zn transfer from soil to the plant.