Summary:

Hand watering or sprinkler irrigation is mostly used in transplant produc-tion of tomatoes grown in pots with organic substrates. The flood irrigation on the tables or on the flood floors is applied in the ornamental plant production and more recently and more often in transplants production of the tomato and the cucumber cultivated in cubes of rockwool. The aim of the investigations conducted in 2008-2010 was to determine the influence of the flood fertigation with different concentration of the nutrient solution (the EC = 1,5, EC = 2,5, EC = 3,5,
EC = 4,5 mS.cm -1) on the growth and development of the greenhouse tomato transplants cultivated in peat substrate. The transplants were cultivated on heated flood floor. The pots with tomato plants during fertigation were flooded to height of 3-4 cm by period 30 minutes. The kind of fertigation had no significant influence on the growth and development of tomato transplants. The plans obtained from flood fertigation and from hand watering characterized the similar height, thickness of stem, fresh and dry matter and also surface and number of leaves. Tomato transplants fertigated with nutrient solution of EC 2,5 and 3,5 mS cm-1. had best parameters such as the height, fresh matter content, surface and the number of leaves. The higher concentration of the nutrient solution up to EC -
4,5 mS.cm -1 decreased stem diameter of transplants and increased content of the dry matter. The macro nutrient status of the tomato transplants (the NPK and Ca) were on similar level both for flood fertigation and for hand fertigation. The sig-nificant lower nitrogen content in the tomato plants was obtained in lowest con-centration of applied nutrient solution (EC 1,5 mS.cm-1). The total salinity in peat substrate increased with higher concentration of the nutrient solution. The higher concentration of mineral elements in peat substrate was find in conditions of the flood fertigation as compare to hand watering.