A new mobile app from Pioneer takes much of the guesswork out of estimating corn yields. Instead of measuring, counting (and usually re-counting) kernels to determine yield potential, farmers can simply snap a picture with the Pioneer Corn Yield Estimator app to quickly and accurately determine the number of kernels on an ear of corn.

"We’ll all count this ear differently," Jeremy Groeteke, U.S. digital agriculture lead for Corteva Agriscience, said while holding up an ear of...