The effect of different silicon-containing fertilizers (NanoKremniy, Siliplant, biostimulant “Bona Forte” and sodium silicate) on the growth, development and yield of hybrids of cucumber Byorn F1 and tomato Merlis F1 was studied under conditions of low-volume hydroponics. The studies showed that carrying out foliar feeding of tomato resulted in earlier production and reliable yield increase of 6.5–8.0 kg/m 2 by increasing the number of fruits by 10–12% and the average fruit weight by 18–23%. Using of silicon-containing fertilizers in the cultivation of cucumber in the winter-spring turnover increased the area of the assimilation apparatus of plants, the number of formed fruits, and their average weight. The quality of the yield improved by increasing the dry matter content and by decreasing the content of nitrate nitrogen in fruits from 382 to 181–230 mg/kg. The maximum increase in cucumber yield of 5.3–6.5 kg/m 2 was achieved with the use of a siliplant and a silicon-containing biostimulant.