Agronomic biofortification of maize with selenium (Se) in Malawi
Agronomic biofortification of maize with selenium (Se) in Malawi
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DOI：
10.1016/j.fcr.2011.08.014
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发表时间：
2012-01-28
影响因子：
5.8
通讯作者：
Broadley, Martin R.
中科院分区：
文献类型：
--
作者：
Chilimba, Allan D. C.;Young, Scott D.;Broadley, Martin R.
由于大多数土壤中植物可利用硒含量低和食物选择狭窄，马拉维普遍存在膳食硒摄入量不理想的情况。本研究的目的是确定在马拉维使用富硒肥料对玉米进行生物强化的潜力。测定了玉米对三种硒硒肥的反应。施用Na2SeO4(aq) （0-100 g Se ha(-1)）、复合氮磷钾+ Se肥料（0-6 g Se ha(-1)）或富硒硝酸钙（CAN + Se; 0-20 g Se ha(-1)）的液体水肥。采用Na2SeO4（aq）和NPK + Se，于2008/09年和2009/10年分别在6个试验点和3个CAN + Se试验点（共30个试验单元）进行试验。在所有硒形式和施用量下，籽粒硒浓度的增加近似呈线性（30个试验单元中有27个单位的R-2浓度为0.90）。Na2SeO4（aq）、NPK + Se和CAN + Se每处理1 g硒，全粒硒平均增加20、21和15 μ g Se kg（-1）。施硒对谷物和秸秆产量无影响。根据马拉维国家玉米消费模式，在玉米作物上施用5克硒（-1）将使膳食硒摄入量增加26-37 μ g硒人（-1）天（-1）。在马拉维，如果在经济和政治上都可以接受的话，通过现有的国家农业投入补贴计划（FISP），硒农业生物强化在理论上是可行的。(C) 2011 Elsevier B.V.版权所有
Suboptimal dietary Se intake is widespread in Malawi due to low levels of plant-available Se in most soils and narrow food choices. The aim of this study was to determine the potential for biofortifying maize using Se-enriched fertilisers in Malawi. The response of maize to three forms of selenate-Se fertiliser was determined. Crops were treated with a liquid drench of Na2SeO4(aq) (0-100 g Se ha(-1)), a compound NPK + Se fertiliser (0-6 g Se ha(-1)), or Se-enriched calcium ammonium nitrate (CAN + Se; 0-20 g Se ha(-1)). Experiments with Na2SeO4(aq) and NPK + Se were conducted at six field sites, and at a subset of three sites with CAN + Se, in 2008/09 and 2009/10 (i.e. 30 experimental units). The increase in grain Se concentration was approximately linear for all Se forms and application rates (R-2 > 0.90 for 27 of the 30 experimental units). On average, whole-grain Se increased by 20, 21 and 15 mu g Se kg(-1) for each gram of Se applied as Na2SeO4(aq), NPK + Se and CAN + Se, respectively. Grain and stover yields were unaffected by Se applications. An application of 5 g Se ha(-1) to maize crops in Malawi would increase dietary Se intake by 26-37 mu g Se person(-1) d(-1) based on national maize consumption patterns. Agronomic biofortification with Se in Malawi is feasible in theory through the existing national Farm Input Subsidy Programme (FISP) if deemed to be economically and politically acceptable. (C) 2011 Elsevier B.V. All rights reserved.