Soil samples
experimental tanks
randomly
collected
upper 5-cm layer
soil surface
diameter
core sampler
layer
selected
sampling
reactive
greater
influence
quality
deeper layers
containing
corners
during
experiment
Determination
accomplished
inserting
glass electrode
pulverized
containing
de-ionized water
matter
determined
loss on ignition
crushed
weighed
evaluated
porcelain crucibles
each sampling