Single-piece floating tray for hydroponic cultivation

A method for hydroponic cultivation according to which seedlings or bulbs to be cultivated are housed inside cultivation cells of a single-piece tray,

• wherein each cultivation cell includes a housing and a buoyant portion, wherein each housing defines a raised plane and is configured to house a bulb or seedling to be cultivated, said housing having a hole with dimensions such as to support the bulb or seedling to be cultivated without allowing it to fall through, while allowing its roots to protrude below the single-piece tray;
• and wherein the buoyant portion defines a lowered plane and is delimited by side walls which extend upwards from the lowered plane and are connected to said raised plane,
• the method comprising placing said single-piece tray inside a tank containing water so that:
• a first inner volume of the single-piece tray with a first height remains below the waterline when the bulb or seedling to be cultivated is placed in the cultivation cell,
• a second inner volume of the single-piece tray with a second height remains above the waterline when the bulb or seedling to be cultivated is placed in the cultivation cell and sinks below the waterline completely when the bulb or seedling to be cultivated has become a mature plant;
• a third inner volume of the single-piece tray with a third height remains above the waterline when the bulb or seedling to be cultivated has become a mature plant;
• wherein the sum of said first height, second height and third height corresponds to a height of the side walls of the single-piece tray between said raised plane and said lowered plane and wherein said side walls form a channel which allows the passage of gas or venting between each housing and a space outside the single-piece tray.