In the spirt of Thomas Edison’s 10,000 approaches to making a lightbulb that do not work, here is one method that does not produce happy corn: 22 C (72 degree fahrenheit, a comfortable room temperature), under 24 hour LED lighting*. However, as failures to produce happy plants go, this had a more attractive outcome than most:
B73 under cold and/or light and/or day length stress.
*For those familiar with corn, it will seem perfectly obvious that it wouldn’t like these conditions. Corn is happiest with temperatures in the mid to high 80s, and really prefers short days.