Here are pics showing corn in a field where in some spots had K deficiency.  The first pic shows what it looked like on 7/20. The 2nd pic shows the plants in the k defictent (kd) area on 8/23, while the 3rd shows the normal corn (nc) also on the 8/23.
 On the 23rd the kd plants were just about as tall as the nc, but are at least a week or more behind in maturity and appears the stalk diameter is smaller, so maybe less plant biomass.
 

(larkins sw corn kd 7 20 2017 003.jpg)

(larkins sw 8 23 2017 002.jpg)

(larkins sw 8 23 2017 004.jpg)

larkins sw corn kd 7 20 2017 003.jpg (108KB - 70 downloads)

larkins sw 8 23 2017 002.jpg (93KB - 72 downloads)

larkins sw 8 23 2017 004.jpg (75KB - 71 downloads)