Soil
pH in unplanted pots either did not change significantly
from week 4 to week 16 or changes were relatively small,
but pH of both bulk and rhizosphere soils from ryegrassplanted
pots increased 1 pH unit or more from week 4 to
week 16 under both fertilization regimes. In addition,
rhizosphere pH at week 8 was higher than that of bulk soil
with PM, but not Con. This same trend was not seen at
week 16; however, at this point the roots were fully
dispersed within the pots and the spatial difference between
bulk and rhizosphere soils was small, and probably the
primary factor behind the chemical similarity between the
bulk and rhizosphere soils at this time. There were
significant correlations between rhizosphere soil pH and
plant yields at week 8