Hydraulic and earth engineering – Drainage or irrigation
Patent
1985-08-05
1986-04-22
Hafer, Robert A.
Hydraulic and earth engineering
Drainage or irrigation
A01G 2700
Patent
active
045838801
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cultivation plant of the type comprising means buried in the ground for providing an artificial irrigation of plants above and at least slightly aside of the irrigation means buried in the ground.
An apparatus of the said type is known for instance from the German laid open publication No. 2 610 384. The known apparatus comprises a number of interconnected tanks which are partly filled with water and which can successively be refilled from a central source of water. A wick is from above introduced in the water tanks, and the wick is intended to soak up water and to emit moisture to the ground above and aside of the respective water tank.
The known apparatus is disadvantageous in some respects. A fresh wick has a relatively good ability of soaking up water, sometimes even too a strong soaking ability for being suited for some plants. By time, however, small particles in the ground chokes the pores of the wick so that the soaking ability of the wick successively is reduced or may even be stopped.
Further, the water tank substantially is only suited for being placed horizontally, and if the ground is slooping problems appear in that the water at one end of the tank is on a higher level than at the opposite end of the tank, and therefore there is a risk that the wick provides an uneven soaking up and distribution of water to different parts of the ground above the tank. Further there is a risk that the water, especially when refilling the tank with water, completely or partly flows out through a tank located on a high level and enters water tanks located on a lower level. In order to solve this problem the said German laid open publication suggests the introduction of special types of drain traps between the respective tanks when the cultivation plant is provided in slooping ground.
The previously known cultivation plants also are disadvantageous in that the water remains still-standing during relatively long periods of time what may lead to the formation and re-formation of harmful bacteria in the water. Further the water tanks have no supply of air and therefore the cultivation plants cannot assist in introducing oxygen into the ground above the water tanks. Also the known plants are formed so that the water tanks cannot receive excess of rain water, and at rain the ground above the water tanks may get to a strong moisture in that moisture is supplied both from the water tanks underneath the ground surface and from above by the rain.
Since further the water tanks are directly interconnected to each other and to water supply conduits the filling of the tanks are made successively from the highest located tank and further down to the subsequent tank or tanks. It is difficult to watch the filling of the tank, and in some previously known cultivation plants a tank located on a low level gets a substantially higher water pressure than the water tanks placed on a higher level.
The object of the invention therefore is to solve the problem of providing a cultivation plant comprising one or several water accumulators buried in the ground underneath the area to be irrigated and in which the water accumulators are formed so that they can be placed in any wanted position or levelling without the risk that the water accumulators get different water level at their ends or that a tank located on a low level gets a higher water pressure than a tank located on a higher level. The cultivation plant according to the invention further is designed so that each water accumulator is directly connected to a source for filling the tank with water. The water accumulator is a closed container which at the top and/or at the side thereof is formed with moisture distribution openings, and the closed container is filled with a porous, water-soaking substrate of a type which is capable of binding essential amounts of water. The cultivation plant further is formed so that the water accumulators are continuously maintained at a predetermined degree of moisture or alternatively so that the degree of moisture
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DeMille Danton
Hafer Robert A.
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