REQUIREMENTS FOR THE DETERMINATION OF WATERS USED FOR A CULTURAL SUPPLY TREATY AND CULTURAL CONTAINES FOR THEIR USE.

摘要

PCT No. PCT/FR91/00615 Sec. 371 Date Mar. 26, 1992 Sec. 102(e) Date Mar. 26, 1992 PCT Filed Jul. 25, 1991 PCT Pub. No. WO92/01365 PCT Pub. Date Feb. 6, 1992.The device for determining the quantity of water required by a cultivation medium placed in a tray (100), comprises a vertically disposed measuring wheel (10) mounted on a vertical partition (106) in such a manner as to be free to rotate about a horizontal axis (19), while being unbalanced. The bottom portion of the measuring wheel (10) is situated a few millimeters from the bottom of the tank of the tray. The measuring wheel comprises a first portion (14) which is not very hydrophilic and which has a mean relative density of less than unity, and a second portion provided with hydrophilic means (13) that cause the unbalance of the wheel to vary as a function of the quantity of water retained in the hydrophilic means (13). The measuring device includes display means (15) for displaying the angular position of the measuring wheel (10), thereby providing an indication of the watering requirements of the medium.