Yeah, it didn't blow my mind but I'm glad that people do the science so we can actually quantify these things. They had big improvements up to 4 species and then the gains were less as they increased it.

Of course this doesn't mean you can drop monoculture in agriculture. You still need your grains to mature at the same time so you can harvest mechanically. Buyers don't want mixes of stuff either. All that jazz. But lawns would probably be much better off with mixed plants.