On the cover: Researchers in New Zealand studied whether fluorine from superphosphate fertilizer has a negative impact on clover, a legume species widely used in New Zealand pastoral farm systems. See Thangavelautham Geretharan et al., “Fluorine and white clover: Assessing fluorine's impact on Rhizobium leguminosarum,” https://doi.org/10.1002/jeq2.20089. Photo by James Hanly.

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封面图片，第49卷，第4期

封面人物：新西兰的研究人员研究了过磷酸钙肥料中的氟是否对三叶草（在新西兰牧业农场系统中广泛使用的一种豆科植物）产生负面影响。参见Thangavelautham Geretharan等人，“氟和白三叶草：评估氟对豆科根瘤菌的影响”，https ：//doi.org/10.1002/jeq2.20089 。詹姆斯·汉利（James Hanly）摄影。