Sampling for the End-of-Season Corn Stalk Nitrate Test
Sampling corn stalks this fall will likely be later than normal due to the delayed planting in many Iowa cornfields. The overall suggestion is to wait until crop maturity, and sample within 1-3 weeks after kernel black layer. This does not work well for silage corn, so the suggestion is to collect stalk samples at the time of silage harvest or within 24 hours after harvest (as long as no rain between harvest and sampling).