She is using a "planter". That is a quite expensive and complicated machine. It's used for crops that have expensive seeds or very precise planting requirements. Corn seed is expensive and a significant cost of growing the crop. So, you want to make the best use of the seed. A planter will meter out seeds one at a time and place them a fixed distance apart in the seed rows. Seed depth is also carefully controlled. Corn will yield better if plants are optimally spaced in the row. Less sophisticated seeding equipment (e.g. air drill, air seeder) will randomly space out seeds in the row. For lower cost seeds like wheat, that's typically good enough and it is a simpler machine.

Another difference is that planters typically have wider row spacings. For corn, that's not a problem because the plants want more space. However, for cereal crops like wheat, ideally the spacing should be smaller. Typically spacing for wheat might be 8 to 10 inches but even narrower might give optimal yield. To get narrow spacing, you need more seed rows and those get expensive given the complexity of the planter system (high cost per seed row).

In area she is farming, corn and soybeans are the major crops. There are a bunch of other field crops they might grow. Wheat is one but there are many others.

Example planter manufacturer (lots of other companies make them):

https://www.monosem.com/Products/Planter/Monoshox-NG-Plus-M