Effect of defoliation on competition between Poa annua plants

This dataset shows shoot and root masses of Poa annua plants grown in split root boxes with N supplied equally or unequally to the two chambers.  In expt 1, half the plants are subject to defoliation, while in expt 2, pairs of plants are grown in a three-chamber split root box with a shared center (competition) chamber.  N was supplied either to the outer or center chamber, and half of the "competitor" plants were subject to defoliation