ISHS Acta Horticulturae 352: VI International Symposium on Rubus and Ribes
BLACK CURRANTS GROWN IN SIMULATED CLIMATES IN GROWTH CHAMBERS |
| Author: | G. Redalen |
| Abstract:
Container grown bushes of black currant (cvs Ben Sarek and Ojebyn) were placed in climate chambers from just after flowering until late autumn 1991. Three climates were simulated: A. Stockholm climate (at about 60°N), B. Modified Stockholm climate with a temperature 2°C higher than normal (a possible greenhouse effect), and C. Frankfurt climate (at about 50°N). Total shoot growth during the 1991 growing season was most vigorous in treatment A and rather weak in treatment C. Fruit yield was highest in treatment C and lowest in treatment B. Number of flower clusters per bush was recorded in the spring 1992, and treatment C gave only 42% of the cluster number in treatment A. The cluster number in treatment B was intermediate. Fruit set and yield were low due to poor conditions during flowering. The yield was sufficient, however, to allow an evaluation of fruit quality properties. Vitamin C content was significantly higher in treatments A and B than in treatment C. Titratable acids content was highest in treatment B and lowest in treatment A. For fruit juice colour, the two cvs responded somewhat differently to the different climates, and Ojebyn had a poorer colour quality when grow in the 50°N climate. | |
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