Summary
Jarrell and Beverly's 1981 paper in Advances in Agronomy provides a detailed mechanistic account of the 'dilution effect', whereby rapid increases in plant dry matter production outpace the capacity of roots to absorb and translocate mineral nutrients, resulting in lower nutrient concentrations per unit of biomass. The paper is considered a foundational reference in the agronomic literature on nutrient dilution, offering a physiological framework to explain empirical observations of declining mineral density in high-yielding crops. It likely synthesises existing plant physiology and agronomy literature to articulate why yield gains do not automatically translate into proportional gains in total nutrient uptake.
UK applicability
Although not conducted under UK-specific conditions, the physiological principles described are broadly applicable to arable crop production in the UK, where successive yield improvements in cereals and other crops have raised similar concerns about nutrient density trends in food supply chains.
Key measures
Tissue mineral concentration (mg/kg or %); dry matter yield; nutrient uptake rates; nutrient use efficiency
Outcomes reported
The paper examines the physiological basis by which increased crop yields lead to dilution of mineral nutrient concentrations in plant tissue, exploring the relationship between biomass accumulation and nutrient uptake rates. It likely reports on how differential growth rates between structural and nutrient-accumulating plant components contribute to observed declines in tissue mineral concentrations.
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