Comparative Studies on the Quality of Tomatoes from inorganic and Organic Cultivation

概要

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Full ripe tomatoes were harvested in hothouses using organic and inorganic cultivations. The chemical constituent of the soils and tomatoes were analyzed, and a sensory test was conducted.The obtained results were as follows; 1) Available nutrients were more abundant in the soil with organic cultivation than in that with inorganic cultivation. 2) Tomatoes from the organic cultivation contained higher concentrations of ash, magnesium, phosphorus, organic acid and nitrous acid than that from the inorganic cultivation.However calcium, vitamin C and sucrose (brix) were less abundant.The contents of total ash, magnesium and phosphorus in the tomatoes were affected by the soil components, except for total calcium. 3) The nitrate-nitrogen concentration of the soil showed a positive correlation to the nitrous acid in the tomatoes.We suggested that vitamin C in the tomatoes decreased due to nitrous acid. 4) The red color of the organically grown tomatoes was deeper than that of the inorganically grown ones.The red color and amount of vitamin C had a negative correlation (r=-0.524 p<0.05). 5) A paired difference test revealed that inorganically grown tomatoes were higher than organically grown ones with respect to sweetness and overall evaluation.
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