Summary
This systematic review synthesised published comparative data on nutrient composition of organic versus conventional crops using the Wilcoxon signed-rank test to identify significant differences. Organic crops demonstrated statistically significant higher levels of vitamin C, iron, magnesium and phosphorus, and significantly lower nitrate content than conventional counterparts. The review also noted non-significant trends suggesting better protein quality and higher nutritionally significant mineral content in organic crops, alongside lower heavy metal residues.
Regional applicability
The study surveyed published international literature without specifying geographic scope, so applicability to United Kingdom production and consumption is not explicitly established. UK growers and consumers would benefit from UK-specific comparisons, as soil conditions, cultivation practices and regulatory frameworks differ from other regions included in the review.
Key measures
Vitamin C, iron, magnesium, phosphorus, nitrate content, protein quantity and quality, heavy metal residues, mineral content
Outcomes reported
The study compared nutrient content (vitamins, minerals, nitrates, heavy metals, protein quality) between organic and conventional fruits, vegetables and grains using published literature. Statistical analysis identified significant differences and trends in nutrient composition between production systems.
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