We have ran the zippers on about 500 acres of no-till beans into corn stalks and are quite pleased with the results so far. I have attached some pictures I took of a wet spot that had last year’s grass matted down on it.
I believe that the crumbling action of the spikes combined with the firming action of the solid portion of the wheel is key in getting rid of air pockets in our soil conditions. This holds true in drier areas as well. The spikes tend to break up chunks that the no-till coulters throw out and move that soil back over the seed trench. The wheels then firm the soil without packing it over the seed.
Thanks again for a well-designed product and EXCELLENT service!