Where I live, especially during the rainy season, certain parts of the farm produce so much biomass. I'll see if I can put a recent picture here. The locals slash it down, pile it up, and burn it, or leave the pile to rot in place. And yet the tropical soils here are STARVING. In many places the top soil is gone and farmers are trying to grow into a gravely, lifeless subsoil. It's a lot of work, but my method is to slash it down with a machete, chop it into a size I can handle (about 2 ft) and then spread it everywhere. Around trees, between rows in annuals and around perennials. When we get rains here they are torrential, so having the mulch in big pieces helps keep them from washing away. They help some with weed suppressing. Weeds will sprout in and on the mulch, but they are easy to yank out on a walk through, and are often beneficial type weeds like blackjack, which all the livestock, especially the rabbits love. Also some of the chopped mulch doesn't die, it will try to re-root. Again just keeping vigilant and yanking up the piece if you see it starting to sprout leaves. The soil is so hungry that it will eat through 6 inches of compost in one 4 month season. You will find nothing but a few of the fattest sticks left. So for me, it's part of a never ending cycle of controlling the bio-mass, and feeding/rebuilding the soil.