美国农业部(usda)周一公布的每周作物生长报告显示，截至5月10日当周，美国玉米种植率为67%，前一周为51%，去年同期为28%，五年均值为56%。
当周，美国玉米出苗率为24%，前一周为8%，去年同期为9%，五年均值为22%。
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