| 摘要 |
The improvements consist, on the one hand, in making the holes 5 for cascade passage both of the nutrient liquid and of the roots of the plants 3, said holes being substantially distant from the base 6 of the intermediate channels 4-4'-4", which allows a certain flooding of the lower region of each channel, the water having to overflow via the aforesaid upper (raised) holes 5. Moreover, provision has also been made for it to be possible for the supply of nutrients to take place alternately, in addition to individually, for example every two plants, or in-line, i.e. a single supply for all the plants 3. <IMAGE> |
