Cate%20and%20Nelson%20(1965)

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Cate and Nelson (1965) yield versus soil test
level Two Groups1. probability of response to
added fertilizer is small2. probability of
response to added fertilizer is large A.Percent
yield values obtained for a wide range in
locations (fertilizer rate studies) Percent
yield yield at 0 level of a nutrient / yield
where all factors are adequate B. Soil test
values obtained (Check Plot) Will generate a
single yield and one soil test value for each
location C. Scatter diagram, yield (Y axis)
versus soil test level (x axis) Range in Y 0
to 100 D. Overlay -overlay moved to the point
where data in the / quadrants are at a
maximum -point where vertical line crosses the x
critical soil test level
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Critcal level depends on the extraction method
used and crop being grown. Cate-Nelson Maximizes
the computed chi-square value representing the
test of the null hypothesis that the of
observations in each of the four cells (quadrants
is equal).
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120
100
80
Percent Yield
60
40
20
0
0
20
40
60
80
100
120
Soil test P, ug/g