PPP Special 08 - Institut für Entwicklungs- und Agrarökonomik

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secondary consequence of drought because nutrients cannot be
sufficiently transported in the soil and inside the plant.
Since water is a major factor that determines productivity, the sample
analysis was differentiated by irrigation.
Figure 4.6 shows yields for irrigated and non-irrigated cotton in across
and in on-farm comparison.
Figure 4.6:
Cotton yield for different conditions, across-farm
and on-farm comparison, 2002
Yield [kg/ha]
2000
1500
1000
500
Irrigated
Non-Irrigated
0
B t-C otton O nly-B t-C otton N o n-B t-C otton
Cross-Farm Com parison
Yield [kg/ha]
2000
1500
1000
500
Irrig ated
Non-Irrigated
0
B t-C o tto n
On-Farm Comparison
N o n -B t-C o tto n
Source: Own Calculations, 2002
Under rain-fed conditions, there are no significant differences between
Bt and non-Bt cotton yields for across-farm comparison (see Annex A-4
and A-5). The on-farm comparison shows a small yield increase for Bt
cotton under rain-fed conditions. There are differences for cotton under
irrigated conditions. The Bt cotton groups show significant higher yields
as compared to non-Bt cotton.