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Ladies and Gentlemen, Aug. 23. 1996 We need advice on the following problem: An experiment with drip irrigation in pickling cucumbers is carried out at our institute. The drip tape is laid out in different ways (on ground under the mulch-foil, subsurface under the mulch-foil, between the rows, between every other row). After culture has ended (approx. Mid-September) it is planned, to give one additional watering, with color-marked water. Immediately afterwards trenches will be digged, and the wetted zone under the emitters of the drip-tape will be visible because of the colormarker in the irrigation water. So far the theory. We hope to gain more information on water infiltration patterns into the soil on our specific site. Example: The size of the wetted zone for apropriate placing of moisture sensors (we use tensiometers). As far as we know methyl-blue or amaranth (red colour) are usable substances for colormarking of the irrigation water. But we donīt know which amount of colour-marker per liter of water is advisable to use, and for how long the colourmarker will be visible in the soil. Does anybody know more about the described technique, or were to get more information on it? Has anybody already worked with this technique? We are certainly very grateful for any tips and hints on the subject. In case you have any more questions on the project you are very welcome! Thanks very much in advance T.C. Mosler adress: T.C. Mosler Technische Universitaet Muenchen Section Vegitable Production Versuchsstation Duernast D-85350 Freising-Weihenstephan Tel: 49-(0)8161-713157 Fax: 49-(0)8161-713433 e-mail: veginst3@pollux.edv.agrar.tu-muenchen.de