Sub-irrigation bed and cultivation apparatus

A cultivation apparatus, comprising a sub-irrigation bed comprising:

• a bottom;
• a side wall surrounding the bottom and consisting of a first wall, a second wall opposite to the first wall, a third wall adjacent to the first wall and the second wall, and a fourth wall opposite to the third wall and adjacent to the first wall and the second wall;
• a water inlet disposed on the first wall;
• a water outlet disposed on the second wall and equipped with a water plug configured to block the water outlet from communicating with the outside of the sub-irrigation bed, wherein the bottom is inclined downward from the water inlet to the water outlet;
• and
• a plurality of cylindrical support structures each separately spaced and arranged on an upper surface of the bottom, wherein the plurality of cylindrical support form an inline array having 17 rows and 10 columns and heights of the plurality of cylindrical support structures are gradually increased from the water inlet to the water outlet to ensure that tops of at least a part of the plurality of cylindrical support structures lie in the-same horizontal plane, wherein
• each of the plurality of support structure is a hollow support structure;
• an entirety of an upper surface of the hollow support structure is mesh;
• and a periphery of the hollow support structure is provided with a plurality of drainage holes;
• a settling pond in communication with the water outlet is formed at the bottom;
• a filter tank is arranged at an upper part of the settling pond;
• and
• two curved water channels are formed on a side wall of the settling pond;
• the two curved water channels are perpendicular to the water outlet and outlets of the two curved water channels are disposed on opposite sides of the water outlet;
• the two curved water channels are L-shaped and a fluid from the two curved water channels mix at the water outlet and flows in a direction perpendicular to a bottom of the settling pond;
• the water plug blocks the water outlet for irrigating;
• water is fed from the water inlet;
• after reaching an irrigation level required by plants, the substrates begin to absorb water and fertilizer due to a capillary action;
• after the absorption ends, the water plug is opened, the remaining water and fertilizer flow to the settling pond along a slope under an action of gravity and flow into the settling pond through the filter tank;
• plant debris and substrate residues contained in the water and fertilizer are filtered when passing through the settling pond;
• the water and fertilizer flow through the settling pond, then flow to the water outlet through the two curved water channels and flow out of the water outlet;
• and the filter tank can be removed and can be assembled back to the settling pond after impurities are cleared;
• and the substrates flowing out with water can be removed by removing the filter tank without moving the sub-irrigation bed, thus the water flows from the first wall to the second wall irreversibly;
• and
• the sub-irrigation bed consists of a single reinforcing rib under the bottom, perpendicular to the same horizontal plane, and configured to support the bottom, wherein the cylindrical support structures disposed on the bottom from the first wall to the second wall and the cylindrical support structures disposed on the bottom from the third wall to the fourth wall form a rectangular shape;
• and the total number of the cylindrical support structures is 170;
• and
• a cultivation container, wherein the cultivation container is supported on the plurality of cylindrical support structures of the sub-irrigation bed.