Vol. 51—1997 - NorthEastern Weed Science Society

Waggone
December 24, 1994
142
soil furni
An n2 of 5
In an appe
Yield
50 kg/ha of nitrogen and the rest is applied.
Ortiz-Monasterio's yields.
show equations.
In words,
/ha = Function that increases as herbicide and
fertilizer lift weeds.
Ha field = 5 tons/ Yield t/ha.
After conn
fertilizer
can specif
holistic w
First I ma
rates. On
eastward 0
increases
contours 0
because th
soil furni
eastward a
A ridge of
herbicide
Expense E = [e(a) * Ha field] +
[e(h) * Ha field * kg/ha herbicide] +
[e(n) * Ha field * kg/ha fertilizer].
cting herbicide to weeds, then weeds and
rate to yield, then area all the way to expense, I
exchange rates and reason in an integrated or
y.
yield on coordinates of herbicide and fertilizer
he map of Fig 10, the rate of herbicide increases
right from 0 to 2 kg/ha and of fertilizer
orthward toward the top from 0 to 250 kg/ha. The
yield rise little up the left, western boundary
fertilizer is wasted on weedy crop. Because the
hes some nitrogen, the contours of yield do rise
ong the bottom boundary as herbicide kills weeds.
high yields curves up northeastward where
nd fertilizer increase in step.