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Zinc Uptake Translocation and Remobilization in Winter Wheat as Affected by Soil Application of Zn Fertilizer

机译：施用锌肥对冬小麦锌吸收转运和迁移的影响

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Effect of zinc (Zn) application to soil on root growth and Zn uptake and translocation in winter wheat are poorly understood. This study evaluated the effect of soil Zn fertilization (0, 2.3, 5.7, 11.4, 22.7, 34.1 kg of Zn ha−1) on root growth and distribution, crop Zn uptake, root-to-shoot translocation of Zn, and remobilization of Zn from shoot to grain. Results of this study revealed that Zn application ≤11.4 kg ha−1 significantly increased root dry weight, root length density, and root surface area within 0–30 cm soil depth and higher rates of Zn application caused slight decreases in these root parameters. Shoot biomass and shoot Zn accumulation increased as Zn application rate increased mainly because of improved matching of root growth and enhanced availability of Zn in the topsoil layer. Post-anthesis Zn uptake by shoot increased and translocation of Zn from root to shoot decreased as rate of Zn application increased. The degree to which Zn accumulation in grain resulted from pre-anthesis remobilization vs. post-anthesis shoot uptake depended on Zn availability in soil; post-anthesis shoot uptake dominated at DTPA-Zn concentrations >7.15 mg kg−1, and pre-anthesis remobilization dominated at lower soil Zn levels. In conclusion, Zn uptake, translocation and remobilization to grain were affected by root growth and its matching with the availability of soil Zn. The results suggest that soils similar to the study soil should be fertilized to 30 cm depth with about 11.4 kg ha−1 Zn in order to obtain high yield and grain Zn concentration of wheat.
机译：对土壤中锌（Zn）的施用对冬小麦根系生长以及锌吸收和转运的影响知之甚少。这项研究评估了土壤锌肥（0、2.3、5.7、11.4、22.7、34.1 kg锌ha -1 ）对根系生长和分布，作物吸收锌，从根到茎的影响锌的转运，以及锌从新芽到谷粒的迁移。这项研究的结果表明，在土壤深度为0–30 cm内，施用Zn≤11.4kg ha −1 会显着增加根部干重，根长密度和根部表面积，而较高的Zn施用量会导致这些根参数减小。随Zn施用量的增加，枝条生物量和枝条中Zn的积累增加，这主要是由于根系生长的匹配性改善以及表土层中Zn的有效性提高。花后，随着施锌量的增加，枝条对锌的吸收增加，锌从根到茎的转运减少。花前动员与花后芽吸收引起的谷物中锌积累的程度取决于土壤中锌的有效性。在DTPA-Zn浓度> 7.15 mg kg -1 的情况下，花后芽的吸收占主导，而在较低的土壤锌水平下，花前的动员则占主导地位。总之，根部生长及其与土壤锌有效性的匹配影响了锌对锌的吸收，转运和迁移。结果表明，与研究土壤相似的土壤应施肥至30 cm深，并施用约11.4 kg ha -1 Zn，以获得高产量和小麦籽粒锌含量。

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