Science

Not only is the chemistry different from that of earth soil, it lacks the microbes, worms, and other beneficial critters that keep the soil healthy. They're going to have to grow everything hudroponically until there's enough waste to compost into soil they can grow things in. Earth soil rich in microbes and beneficial critters will have to be imported to add to it.

Growing stuff doesn't have to be all that finicky here on Earth, but other planets are going to present exofarmers with a pretty steep learning curve.

However, companion planting and intensive gardening are both well known here in the US, especially among organic gardeners. It's how I got enough out of a 10X10 foot plot to feed two people over the growing season, plus have things to can and freeze at the end of it. The techniques are more suitable to small plots than big farms and require careful attention to soil health. The first thing any exofarmer is going to have to do is create Earth like soil to grow Earth crops.