Feb 18, 2014 - Fertilizer could be too much of a good thing for the world's grasslands, according to study findings to be published online by the journal Nature. The worldwide study shows that, on average, additional nitrogen will increase the amount of grass that can be grown. But a smaller number of species thrive, crowding out others that are better adapted to survive in harsher times. It results in wilder swings in the amount of available forage.
"More nitrogen means more production, but it's less stable," said Johannes M.H. Knops, a University of Nebraska-Lincoln biologist and one of the paper's international co-authors. "There are more good years and more bad years. Not all years are going to be good and the bad years are going to be worse."