Was this field irrigated? If not, my guess is that most of the symptoms you are seeing are related to periods of low soil moisture. The dry conditions in May and June across much of Michigan slowed the progression of corn, and many fields are behind average growth stage. Furthermore, the dry conditions prevented corn plants from taking up adequate levels of nitrogen from soil, even if there was enough fertilizer applied.

The number of rows of kernels on each ear is determined by genetics and also environment - stress from lack of water or nutrition early on in the plant growth stage can result in lower number of kernel rows.

Kernels that are missing on an ear is a sign of poor pollination, which often occurs if we have dry conditions during tasseling. Since corn is wind pollinated, it could also be related to the orientation of the plants in the field and the wind during pollination.

Regarding fertilizer amounts, I would need to know more about the amount of fertilizer applied per acre to give better guidance on whether nitrogen was lacking.