Zipper ears, or ears with missing kernel rows, are a result of stress during pollination or grain fill. Ears affected by zippering have kernels that developed poorly or more slowly than other kernels or have ovules that aborted shortly after pollination. It’s important to understand how and why zipper ears occur and how to minimize their occurrence in the future.

It can be difficult to schedule irrigation, herbicide application and harvest if you don’t have a good handle on corn maturity. Identifying the milkline and blacklayer will help gauge the stage of corn growth and estimate physiological maturity.