DIFFERENCE IN STABLE ISOTOPE COMPOSITION δ^15 N IN ORGANIC AND CONVENTIONAL STRAWBERRY FRUIT SAMPLES

Abstract

Strawberry fruit samples collected in Japan and Dalat (Lam Dong) were analyzed for stable isotope composition δ¹⁵N using the Isotope Ratio Mass Spectrometry system (EA-IRMS). The results of the ANOVA test showed a statistically significant difference at  level among the the stable isotope composition δ¹⁵N in the organic strawberries from Japan compared to conventionally grown and greenhouse grown strawberries in Dalat and Japan, with . Specifically, the mean δ¹⁵N value in organic strawberries grown in Japan (4.720‰) was more enriched than that obtained from samples conventionally grown (0.020‰ and 0.864‰) and greenhouse grown (0.103‰) in Dalat and Japan. Additionally, the average δ¹⁵N value in hydroponically grown strawberries in Dalat (5.283‰) did not differ significantly from the organic strawberries in Japan at the α=0.05 level of significance.