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Southeast WI | The boys are spot on. If it is S, that 100 lbs of ams will get it dark green 3 days after a rain. Out of curiosity what do you have on already and when was it applied?
Lot of positional unavailability happens in that V4-V7 stage range. Normally not much defic on our black soils - we look like farmer geniuses on that ground. Pretty crappy looking corn on our sandy loam to loamy sand spots. Every tiny thing shows up and corn doesn't get "right" till V8-9 stage most years. | |
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sulfur deficiency
