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Yellowing leaves generally indicates a watering issue, either to much or to little.

Sweet Corn does have a shallow root system so I would add another watering. Every 3 days, but certainly increase if the temps are above 85 degrees or the soil is drying to much between waterings.

https://www.gardeningknowhow.com/edible/vegetables/corn/grow-sweet-corn.htm

It is likely a watering issue. In temps above 85 F., they need to be watered more. Most plants require at least 2 inches of water weekly. To ensure they are getting enough, use drip irrigation or soaker hoses. This article may help (though it's for xeriscape areas, as far as watering anything in the garden, it would be the same principles): https://www.gardeningknowhow.com/special/xeriscape/irrigation-systems-for-xeriscape-environments.htm

This happens due to poor pollination. Corn needs to be planted in a certain pattern (side by side rows) and conditions need to be right at pollination time (not too hot or too rainy) for best pollination. If the pollination is poor, you will get spotty kernel growth.

In the future, just to make sure that you get the best production, you may want to hand pollinate your corn. This article will help:
https://www.gardeningknowhow.com/edible/vegetables/corn/corn-pollination-how-to-hand-pollinate-corn.htm

Here are some links for you with more information.

https://www.gardeningknowhow.com/edible/vegetables/corn/grow-sweet-corn.htm
http://www.hort.purdue.edu/ext/ho-98.pdf

A number of things can lead to yellow leaves. This article can help pinpoint likely causes: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

For more corn specific reasons, look toward cooler temps, wet soils, or nutrient deficiencies (a soil test can help determine this).

Here is a link that explains this issue on corn.

https://www.agry.purdue.edu/ext/corn/news/timeless/TasselEars.html