Summary
This paper by Hall and Tilman, published in PNAS in 2022, examines global trends in the nutritional yield of major crops, investigating whether increases in agricultural productivity have translated into commensurate improvements in the supply of essential nutrients. The study likely draws on long-term FAO or USDA crop production and composition databases to model changes in nutrient output per unit of harvested area. The findings are expected to contribute to debates around the 'dilution effect' and the broader nutritional consequences of yield-focused agricultural intensification.
UK applicability
Although the analysis is global in scope, the findings are broadly applicable to UK arable policy, particularly in the context of debates around post-CAP agricultural support, the Environmental Land Management schemes, and concerns about the nutritional quality of domestically produced staple crops.
Key measures
Nutrient yield per hectare (calories, protein, iron, zinc); crop yield (t/ha); nutrient concentration trends over time; dietary nutrient supply estimates
Outcomes reported
The study likely examined how yields of key nutrients (such as protein, iron, zinc, and calories) from major crops have changed over recent decades, assessing whether productivity gains have kept pace with or diverged from nutritional demand. It may have identified trade-offs between caloric yield increases and declines in micronutrient density or diversity.
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