PER UNIT COSTS TO OWN AND OPERATE FARM MACHINERY



Table 1. Model Variables and Respective Estimated Coefficients (Continued).

Variable Meaning__________________________________________________Coefficient

drtwf Regular-till drill and/or air-seed with fertilizer, acres

pntwf No-till plant with fertilizer, acres

prtwf Regular-till plant with fertilizer, acres

Constant

β39


ha Total harvested acres                                                   β40

Error term

Table 2. Estimated Coefficients for the Four Different Models.

Variable

_____Unit

Model 1
(Linear)a

Model 2
(Quadrati c)a

Model 3
(Reciprocal)a

Model 4
(Logari thmic)a

KASb

fcwof

$/acre

5.60

5.66

5.55

5.69

5.92

swof

$/acre

5.42

5.43

5.39

5.43

5.38

dsk

$/acre

6.35

6.43

6.33

6.45

6.48

sch

$/acre

7.88

7.90

7.88

7.90

7.79

dch

$/acre

9.45

9.47

9.42

9.46

9.54

ddch

$/acre

9.27

9.31

9.27

9.30

9.54

mbp

$/acre

8.96

8.97

8.96

8.97

8.98

rcc

$/acre

6.41

6.41

6.40

6.41

6.25

dntwof

$/acre

10.08

10.07

10.03

10.11

9.89

drtwof

$/acre

5.93

5.99

5.88

6.00

6.49

pntwof

$/acre

9.90

9.86

9.79

9.94

10.02

prtwof

$/acre

8.15

8.21

8.11

8.21

8.03

spc

$/acre

3.66

3.69

3.63

3.70

3.75

spf

$/acre

3.73

3.73

3.73

3.73

3.75

spcf

$/acre

3.76

3.75

3.74

3.76

3.75

nh3

$/acre

5.55

5.53

5.50

5.55

5.61

bdf

$/acre

3.42

3.42

3.41

3.43

3.53

ilf

$/acre

3.53

3.51

3.51

3.53

3.57

hw

$/acre

13.78

13.88

13.64

13.93

13.77

whtyd

$/bushel

0.131

0.131

0.130

0.131

0.131

hc

$/acre

20.17

20.28

20.08

20.26

19.43

cornyd

$/bushel

0.126

0.127

0.126

0.127

0.119

hgs

$/acre

14.32

14.23

14.14

14.35

14.58

gsyd

$/bushel

0.128

0.128

0.128

0.128

0.129

hsb

$/acre

19.02

19.16

18.99

19.16

19.48

sbyd

$/bushel

0.127

0.127

0.127

0.127

0.127

hsf

$/acre

18.00

18.00

17.99

18.01

17.93

swth

$/acre

8.35

8.37

8.36

8.38

8.20

rh

$/acre

2.92

2.93

2.93

2.93

2.88

slrb

$/bale

7.34

7.34

7.36

7.36

7.46

llrb

$/bale

7.99

8.02

7.99

8.02

8.15

18



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