posted 6 years ago
I am not sure it was a fair comparison, comparing a place abused by grazing pressure, calling it "fertile", and then comparing places where plants were not abused by overgrazing, if you leave the grass to grow and dont cut it, the succession will start, and then all sorts of other plants will emerge. Sure there are much more species of really small plants than the number of trees, but which is more prodictive, and which will capture more sun energy? Which will create more life in general?
Also nitrates are one of the most used fertilizers, exactly because they lack in the soil handled by humans, most people dont like the dead vegetation, and exactly that when rotting creates the nitrates. Most places with that short grass lack nitrates, it is easy for that to be checked because when you add nitrates the grass start to grow much better.
Fertility is like a spinning wheel, lots of stuff rotting and lots of stuff growing, short grass scenario is not a great fertility place.