Table 4 The relationship between productivity and years of experience

Count

Total

<5 years

5–10 yrs

10–20 yrs

>20 years

Productivity

<2 tons/ha

19

9

0

0

28

2–4 tons/ha

16

23

3

0

42

4–6 tons/ha

1

2

20

16

39

>6 tons/ha

1

1

10

16

28

37

35

33

32

137

Value

df

Asymp. Sig. (2-sided)

Pearson Chi-Square

1.202E2^a

9

.000

Likelihood ratio

143.572

9

.000

Linear-by-linear association

81.480

1

.000

N of valid cases

137