Yellowing Corn in an Old Hops Yard

Which descriptions in the field history could cause stunted and chlorotic corn?
The summer has been unseasonably cool and wet
Post-emergence application of glyphosate
Rows 2 and 3 are often wetter compared to rows 1 and 4
In 2010 the field was left fallow
Roundup Ready corn variety planted in an old hop yard at conventional timing for the region
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