A - Human Necessities – 01 – G
Patent
A - Human Necessities
01
G
A01G 27/00 (2006.01) A01G 25/00 (2006.01)
Patent
CA 2237925
Thousands of newly planted trees die due to lack of water shortly after being planted, especially in semi-arid, arid and mountainous areas. Although the planted trees were enough watered, the water content in root area becomes lower quickly, because the irrigated water either evaporates from the soil surface, flows away or sinks underneath root horizon. Therefore, increasing irrigation efficiency has been a concern in irrigation technique research. The key to solving this problem is related to three factors. First, there should be a continuous water supply. Second, the supplied water should directly enter the root area. Third, the amount of water supplied should be equal to the needs of the plant. Tree Irrigation System with a controller of negative pressure is composed of three parts. A water container is needed in order to supply water continuously. Porous ceramic cups, connecting the water container and soil, are used as the water transfer system and, also as sensors of water potential in soil. The cup allows water to directly enter root area and transmits water potential into the container. A porous ceramic column in the water container is used as a controller of optimal point of water potential according to plant requirements. The capillary force in the porous ceramic column matches this optimal point. This product can save water and cost of production compared with other irrigation methods, such as sprinkler irrigation, drip irrigation etc. It can be used for irrigation of trees and individual plants in pots. It can be fixed in a greenhouse, at home garden and graveyard (especially in European). The flowers do not need frequent watering. Using this apparatus, crop experiments of agricultural and biological research can be conducted according to the water potential (water content) goals of research work require.
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