On the cover: Collecting soil nitrate samples in a recently terminated cover crop plot. See Waring et al., “Influence of no‐till and a winter rye cover crop on nitrate losses from tile‐drained row‐crop agriculture in Iowa,” https://doi.org/10.1002/jeq2.20056. Photo by Emily R. Waring.

中文翻译：

---

封面图片，第49卷，第2期

封面：在最近终止的覆盖作物田地中收集土壤硝酸盐样品。参见Waring等人，“免耕和冬季黑麦覆盖作物对衣阿华州瓷砖排水的行间农业的硝酸盐损失的影响”，https：//doi.org/10.1002/jeq2.20056。艾米丽·R·沃林（Emily R. Waring）摄影。