Iron, manganese (Mn), and magnesium (Mg) are common components of turfgrass nutrition programs. A 2‐yr study was conducted simultaneously in Jay and Citra, FL, to determine the influence of Fe, Mn, and Mg on ‘Palmetto’ St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze.] quality and leaf nutrient concentration. Treatments included foliar Fe, Mn, and Mg sulfate and glucoheptonate; and granular Fe, Mn, and Mg sulfate and sucrate. Treatments were applied monthly from June to September during 2014 and 2015. Turfgrass receiving foliar Fe resulted in increased annual average turfgrass quality compared with untreated turfgrass in Citra during 2014 and in Jay during 2014 and 2015, which was associated with increased Fe in leaf tissue. Granular Mg did not influence turfgrass quality, whereas foliar Mg increased turfgrass quality by ∼10% during the last 4 wk of 2014 in Jay. Generally, foliar Mn did not influence turfgrass quality or tissue Mn concentrations, whereas granular Mn reduced turfgrass quality by ∼20% in Citra during 2015. Granular and foliar forms of Mn or Mg may not be warranted on turfgrass grown under similar conditions. Foliar Fe appears to be a reliable method of increasing St. Augustinegrass quality. Moreover, few differences were measured between foliar Fe sources, indicating that the least expensive foliar Fe source may be the most effective option for consumers. Evidence suggests that granular Fe does not improve turfgrass quality or tissue Fe concentrations and can therefore be removed from St. Augustinegrass nutritional programs without concerns of repercussions.

中文翻译：

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圣奥古斯丁草的品质和养分含量对颗粒和叶面铁，锰和镁的响应

铁，锰（Mn）和镁（Mg）是草皮草营养计划的常见成分。同时在佛罗里达州Jay和Citra进行了为期2年的研究，以确定Fe，Mn和Mg对'Palmetto'圣奥古斯丁草[ Stenotaphrum secundatum（华尔兹。）质量和叶片养分浓度。处理包括叶面的Fe，Mn和Mg硫酸盐和葡庚糖酸盐；以及颗粒状的Fe，Mn和Mg硫酸盐和硫酸盐。在2014年和2015年的6月至9月之间每月进行处理。与2014年相比，Citra和2014年和2015年在Jay的未经处理的草皮草相比，接收叶面铁的草皮草导致年平均草皮草质量提高，这与叶组织中铁的增加有关。粒状Mg不会影响草皮草的品质，而2014年最后4周的周杰伦，叶面镁将草皮草的品质提高了约10％。通常，叶状Mn不会影响草皮质量或组织中的Mn浓度，而颗粒状Mn在2015年期间降低了Citra的草皮质量约20％。Mn或Mg的颗粒状和叶状形式可能不适用于在类似条件下生长的草皮草。铁叶似乎是提高圣奥古斯丁草质量的可靠方法。而且，在叶源铁之间测得的差异很小，这表明最便宜的叶源铁可能是消费者最有效的选择。有证据表明，颗粒状的铁不会改善草皮草的质量或组织中铁的浓度，因此可以从圣奥古斯丁草的营养计划中去除，而无需担心受到影响。