We set the experiment with the intention to determine the relevance of using biostimulants based on brown seaweed (Ascophyllum nodosum L.) in growing cucumbers (Cucumis sativus L.). The main purpose was to monitor the quantity of the yield and evaluate the selected morphological characteristics of the fruit, which determine its quality. The experiment included 2 commercial mixtures Phylgreen® and Fitostim® Alga. We chose a hybrid of the salad cucumber 'Lisboa F1'. The experiment took place in the greenhouse of the Horticultural centre of the Biotechnical Faculty in Orehovlje. It was planned in three blocks: control, use of the mixture Phylgreen® and use of the mixture Fitostim® Alga. We treated the plants with a 0.3% concentration of biostimulants in an interval of 7 days until fool flowering and then in an interval of 10 days until the end of the experiment. Each block had 3 repetitions. The experiment was set on April 5th 2018 and lasted 116 days. The technologically mature fruit was picked 2-3 times a week and evaluated according to the quality standards for salad cucumbers. We found that plants, which have been treated with the mixtures Phylgreen® and Fitostim® Alga, had a smaller field by 13.50% or 14.35% than the controll plants, where we managed to get a yield of 206.825 kg/ha. Regardless of the treatment type, all of the blocks produced 93.1% of extra quality fruits and only 1.61% of non-marketable fruits. At the same time, the examinations of fruits did not detect changes in any of the selected morphological characteristics of fruits.
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