ISHS Acta Horticulturae 191: Symposium on Protected Cultivation of Solanacea in Mild Winter Climates
EFFECT OF POTASSIUM AND MAGNESIUM ON THE QUALITY OF TOMATO FRUITS |
| Authors: | J. Borkowski, E. Szwonek |
| Abstract:
In 1983 tomato plants of cultivar Remiz were cultivated on the board in glasshouse conditions. Tomato plants were grown in sphagnum peat substrate at different levels of potassium: 200, 400, 600 and 1000 mg K · l-1. The redness of tomato fruits was less intensive at the low levels of potassium in comparison to higher ones. The fruits grown at 1000 mg· l-1 level of potassium showed the most intensive red colour and the highest dry matter. It was found that 1000 mg· l-1 level of potassium was still not optimum. The highest marketable and total crop was received from plants which were grown at levels 1000 mg K and 200 mg Mg per liter of substrate. In this treatment also the level of dry matter in fruits was the highest. Results in 1984 were not as distinct as in 1983 because the beginning of the last summer was cold with cloudy days. This weather increased blotchy ripening on tomato fruits. In 1984 difference in total crop between low and high level of potassium fertilization was bigger than in 1983. | |
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