[Effect of highly refined mineral oil summer application, on lemon cv. Lisboa ripening and quality]
1993
Fernandez T, Nicolas
In order to observe its effect on fruit quality and ripening, highly refined mineral oil, at concentrations of 1 and 2%, was applied to cv Lisboa lemon trees at fruit stages in which rind was green and silver. Applications to cv Lisboa lemon trees were performed during the summer season, on December 23th and January 13th. The following ripeness parameters were assessed at 15 day intervals: base color rind roughness and thickness, contents of soluble solids, polar and equatorial diameters, weight, titrate acidity, solubles solids/acidity ratio, percentage of juice and pH. In order to study the behavior of fruit treated in the grove, samples obtained at both stages were stored in a cold environment 7 deg C for 56 days. So as to elucidate the effect of oil on green fruits, a trial was performed, in which was stored at 7 deg C, previously applying doses ranging from 2 to 10%, plus a liquid vaseline coating treatment. It was observed that oil delayed fruit yellowing and weight loss. It also caused a decrease in rind thickness and increase in the content of juice and soluble solids, as well as in titrate acidity. This effect increased when larger doses were used. Fruits treated with vaseline, presented a behavior similar to those treated with oil at 10%. The use of vaseline resulted in a low juice content after 60 days, and in a significant internal dehydration damage after 120 days. To assess a possible effect of oil fruit development, lemons obtained from late spring blossoms were labelled and their growth was measured during 3 months. Neither fruit nor tree phytotoxicity resulting from oil application, was observed
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