Agriculture Reference
In-Depth Information
Table 5. Bt corn adopters and non-adopters, 2005 and 2010
(Sample means of selected variables)
Non
-Bt
Variable
Unit
Bt
Difference Significance
2005
Yield
***
Bushels/acre
155.1
138.6
16.6
1
Insecticide use
Pounds Ai/acre
0.05
0.09
-0.04
Corn price
Dollars/bushel
1.95
2.01
-0.06
NS
2010
Yield Bushels/acre 159.2 132.7 26.5
***
Insecticide use Pounds Ai/acre 0.02 0.02 0.00 NS
Corn price Dollars/bushel 5.39 5.40 -0.01 NS
*
,
**
, and
***
Indicates statistical significance at 10, 5, and 1 percent level, respectively.
NS = Not significant.
1
Significant at the 5-percent level when using standard
procedures but not significant (p value 0.15) when using the delete-a-group
jacknife procedure to estimate variances (Kott, 1998).
Source: USDA Economic Research Service using data from 2005 and 2010
Agricultural Resource Management Survey corn surveys.
Source: USDA, Economic Research Service using data from 2010 Agricultural
Resource Management Survey (ARMS) Phase II corn survey.
Figure 8. Average yields (in bushels per acre) for U.S. corn farmers in 2010.
