トマト果実の着色に関する研究-7-

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The experiments were carried out to ascertain the influence of nutrition on the growth of plant, and on the yield, quality and pigment contents of fruit in 1958 and 1960. Sand culture was conducted in 1958 and field culture in 1960 at the Faculty, Shinshu University. Varieties used were Aichitomato in the former year and Sekai-ichi in the latter.1. Deficiency of nutrient elements (nitrogen, potassium, phosphorus or magnesium) restricted the plant growth. Especially, nitrogen deficiency resulted in the greatest suppression of growth in sand culture, while phosphorus deficiency caused the greatest suppression in field culture. Potassium and magnesium deficient plants were as healthy as control plants.2. In the sand culture, the fruit yield was smaller in nutrient deficient plants. In the field culture, phosphorus deficiency reduced the yield, whereas magnesium and potassium deficiency had no effect on the yield.3. Total acidity in phosphorus deficient fruit was higher than that of fruits lacking the other elements. On the contrary, in nitrogen deficient fruits the sugar contents were higher than those of control fruits or fruits lacking the other elements.4. Plants supplied with nutrient solution lacking a certain element resulted in lower contents of the element in their fruits. This tendency was especially marked in fruits produced in sand culture.5. As to pigment content, phopshorus deficient fruits contained less lycopene, carotene and xanthophyll, but nitrogen deficient fruits contained more lycopene than control. It is considered that in order to harvest fruits of good color, the amount of nitrogen should be as small as possible so long as the yield is not decreased, while phosphorus should be applied sufficiently to avoid its deficiency.
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トマト果実の着色に関する研究-7-

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