FIELD: processes for drying food and vegetable materials, hydroponics. SUBSTANCE: tray is in the form of casing and body on surface of which there are stripes of heat sensitive material with positive and negative heat resistance factors. Said stripes are arranged alternatively in pairs and they are connected with temperature regulator. Such circuit allows to strictly maintain predetermined temperature mode at bridge type connection of stripes. EFFECT: improved design. 4 cl, 3 dwg
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