Organic and chemical fertilizer applications during 1950s–1990s (source from the reference [23]).

Abstract

<p>Organic and chemical fertilizer applications during 1950s–1990s (source from the reference <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0093727#pone.0093727-Liu1" target="_blank">[23]</a>).</p