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Colour Disorders of Ripening Tomatoes: 2. Fruit Colour in Relation to Shade, Soil Moisture Tension and Defoliation
M. J. Woods
Irish Journal of Agricultural Research
Vol. 2, No. 2 (Oct., 1963), pp. 207-216
Published by: TEAGASC-Agriculture and Food Development Authority
Stable URL: http://www.jstor.org/stable/25555305
Page Count: 10
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Shade applied in early June reduced the incidence of non-uniformly coloured fruit, due mainly to a reduction in the percentage of greenback. Shading increased the incidence of yellow blotch and waxy patch, but did not affect the proportion of green blotch. Under unshaded conditions there was no significant effect of moisture tension on the incidence of blotch. Where shade was applied, an increase in the moisture tension from 7 to 14 cm. Hg reduced the incidence of total blotch, green-back, yellow blotch and green blotch. It is suggested that it was through its effect on fruit size that moisture tension influenced the occurrence of colour ripening disorders. Higher moisture tensions (less frequent watering) gave a greater proportion of medium sized fruits and less blotch, while larger fruits and a greater proportion of blotch were produced at low moisture tension. Results obtained from plant rows adjacent to the glass showed that increase in the severity of leafing significantly increased the proportion of non-uniformly coloured fruit in one year only, due to a higher incidence of green-back. This effect was less pronounced where shade was applied. The incidence of either yellow or green blotch was unaffected by leafing.
Irish Journal of Agricultural Research © 1963 TEAGASC-Agriculture and Food Development Authority