I've heard a number of farmers say chicken litter
brings on the weeds in pastures. I have observed
the same myself. Just this summer I saw a bermuda
pastured littered at a 3-ton rate which had abundant
spiny amaranth (not a traditional pasture weed).
Another bermuda pasture which had 300 pounds of
17-17-17 and there was no spiny amaranth. In a
garden located in the same pasture where the
commercial fertilizer was applied, there were
mega spiny amaranth plants growing in sweet
corn under conventional tillage. Why?