Growing radish (Raphanus sativus var. radicula) in plug trays in a floating system
This paper compares the growth of radish 'Tinto F1' grown in a greenhouse in polystyrene plug trays with 84 and 40 cells, on a floating system, with the plants placed on a growing table. Plug trays placed on a floating system were filled with a mixture of perlite and granulated rockwool 1:1, while those placed on a growing table were filled with a peat substrate. Four nutrient solutions were tested in 2 growing cycles in Ljubljana ' the central part of Slovenia. The first cycle took place from 6th April to 21st May 2010, and the second from 27th May to 13th July 2010. Two nutrient solutions were made from reagents and two from water soluble fertilizer (WSF). Two different N concentrations were also tested. Each experiment consisted of three repetitions and the radishes were harvested three times (at weekly intervals) when plants had formed at least a 2 cm large hypocotyl. In both experiments, the trays with 40 cells (264 plants m-2) resulted in a higher % of marketable hypocotyls but the number of marketable hypocotyls was not statistically higher in trays with 84 cells (554 plants m-2). In the second cycle, in which the last harvest was done on 13th July, the radishes grown on a floating system was more than 60% marketable, but the radishes grown in peat in a tray with 84 cells began to flower and less than 15% of the plants formed a fleshy tap root. The addition of N to the nutrient solution accelerated bolting. The radishes grown in the second cycle on a floating system were harvested 7-14 days earlier than the radishes in a peat substrate.
Jakše, M. (2018). Growing radish (Raphanus sativus var. radicula) in plug trays in a floating system. Acta Hortic. 1209, 41-46
hydroponics, plant density, plug tray, nutrient solution