Spraying ZnEDTA at high concentrations: an ignored potential for producing zinc-fortified pear (Pyrus spp.) fruits without causing leaf and fruitlet burns

文献类型： 外文期刊

第一作者： Liu, Mengjiao

作者： Liu, Mengjiao;Xu, Meng;Liu, Mengjiao;Xu, Meng;Fu, Haoran;Tang, Sheng;Ma, Qingxu;Wu, Lianghuan;Yu, Huili;Li, Yanqing

作者机构：

关键词： biofortification; zinc-fortified pear; fertilizer burn; pear fruitlet; chelated fertilizer

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.3； 五年影响因子：4.5 ）

ISSN： 0304-4238

年卷期： 2023 年 322 卷

页码：

收录情况： SCI

摘要： The increases in the Zn-biofortification level are currently limited to the spraying rates, as the widely-used ZnSO4 fertilizer applications at high spraying rates cause leaf and fruitlet burn, along with yield losses. To address this, in our investigation, the effects of inorganic Zn sources and chelated Zn sources at normal to excess concentrations on foliage health, photosynthetic performance, yield, and mineral concentration changes in pear fruits were compared to establish how to maximize the Zn concentration without fertilizer burn. The 2020 field results showed that the chelated Zn sources (ZnEDTA, ZnGly and ZnGlc) caused less foliar burn than inorganic Zn sources (ZnNO3 and ZnSO4). The safety threshold concentration of ZnEDTA was 1.5%, which was substantially higher than that of the other sources (0.4%). The results of the nationwide broad-spectrum tests on eight pear cultivars at three locations in 2021 confirmed that spraying 1.5% ZnEDTA is an effective approach to produce high-level Zn-fortified pears, without compromising agronomic performance. Our study not only provides new insights into chelated fertilizers but will also help to promote producing of Zn-fortified pears.

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