Abstract
To know the factors for nitrate accumulation in tomato fruits, experiments were conducted in 1968 and 1969 seasons, using three canning tomato varieties with various amounts of nitrogenous fertilizer.Results showed that there were no significant differences in nitrate content among varieties, and among fertilizer trials. Even in low nitrogen level (2.5kg/10a), high nitrate concentrations (over 10ppm) were found in some fruits.Spraying plant growth substance (Na 4Cl-2-hydroxymethylphenoxyacetate) gave no effects on nitrate content in fruits.Apparent seasonal changes in nitrate content were noticed. At the beginning of harvest time, nitrate content was low under the influence of rainy season. In the middle, it became higher being affected by hot and dry weather, and in the end, again it became lower being affected by heavy rainfall and plant senescence.As for the ripeness, mature green fruits showed generally higher nitrate content than red fruits. As for the fruit portions, it was high in flesh, especially in the portion just under calyx. On the other hand, it was relatively low in placenta, and was negligible in gelatinous pulp.During 7-10 day storage at room temperature (28°C), nitrate and nitrite contents of fruits were found to be invariable.It was suggested that the nitrate accumlation in tomato fruits was influenced by weather, soil nitrate-nitrogen and plant vigour.
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