The Variable-Rate Decision for Multiple Inputs with Multiple Management Zones



Table 2. Average Returns to Variable-Rate Application of Nitrogen and Water (RVRT*) for
Selected Management Zone Proportions

Proportion of

Field____________

______________________Average RVRT* a________________________

Management Zone 1

Management Zone 2

Management Zone 3

0

$44.41

$2.92

$10.72

0.1

$41.74

$41.59

$22.14

0.2

$38.92

$50.33

$31.69

0.3

$35.91

$50.36

$39.60

0.4

$35.71

$47.93

$42.54

0.5

$29.19

$40.94

$50.25

0.6

$25.33

$34.04

$52.25

0.7

$20.97

$26.34

$50.98

0.8

$15.86

$18.05

$44.80

0.9_______________

__________________$9.43

_________________$9.26

_______________$30.45

a Average RVRT*, represented by the fixed λ in the first column and the management zone in
the column, is determined by averaging the RVRT*s for fields with all combinations of the
other twoλ s. For instance, the $9.43/acre return in the column headed Management Zone 1 is
the average return when the field is 90% management zone 1 and either 10% management zone
2 ($16.38/acre) or 10% management zone 3 ($2.37/acre).

16



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