Summary
Klümper and Qaim's 2014 meta-analysis of 147 studies spanning 1995–2014 provides a quantitative synthesis of agronomic and economic outcomes from global genetically modified crop adoption. The analysis demonstrates that GM crops have typically increased yields and reduced pesticide applications in many contexts, though effects vary substantially by crop type, trait (Bt insect resistance versus herbicide tolerance), geography, and farming practice. The findings contribute to the empirical evidence base on GM crop performance but do not directly address nutritional quality or broader environmental impacts beyond pesticide use.
Regional applicability
The findings have limited direct application to UK agriculture, which has stringent regulatory restrictions on GM crop cultivation. However, the synthesis is relevant to UK policy discussions on food security and import sourcing, particularly for feed crops and commodities sourced from GM-adopting regions.
Key measures
Yield change (%); pesticide application volume or cost; economic returns; pest resistance trait effectiveness; herbicide tolerance trait effectiveness
Outcomes reported
The meta-analysis quantified changes in crop yields, pesticide applications, and economic returns following adoption of genetically modified crops. It synthesised data across multiple crop types, traits, and geographic regions to assess variability in agronomic and economic performance.
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