Leaf area index comparisons of alfalfa under monoculture and intercropping (A) and at different flowering stages (B).

<p>Significant differences between different alfalfa flowering stages are indicated by lower case letters (<i>P</i> <0.05). The other symbols are the same as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0110556#pone-0110556-g002" target="_blank">Figure 2</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0110556#pone-0110556-g004" target="_blank">4</a>.