Summary
This paper by Lester et al., published in HortScience in 2007, investigates the effect of nitrogen fertilisation on vitamin C concentrations in leafy vegetable crops. The study contributes to a body of evidence suggesting that high nitrogen inputs, whilst often promoting vegetative growth and yield, may dilute or suppress the accumulation of ascorbic acid in edible leaf tissue. The findings have implications for understanding trade-offs between agronomic productivity and nutritional quality in intensively managed horticultural systems.
UK applicability
Although the study was likely conducted in the United States, the findings are broadly applicable to UK horticulture, where nitrogen management in salad and leafy vegetable production is an active area of agronomic and policy interest, particularly in the context of nutrient use efficiency and food quality standards.
Key measures
Ascorbic acid / vitamin C concentration (mg/100g fresh weight); nitrogen application rate (kg/ha or equivalent); possibly yield and other quality parameters
Outcomes reported
The study examined the relationship between nitrogen fertilisation rates and ascorbic acid (vitamin C) concentrations in leafy crops, likely finding that elevated nitrogen inputs were associated with reduced vitamin C content in harvested produce.
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