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Stephen >We expect to apply four นไ irrigations in the first two >weeks with greater, less frequent, applications afterwards. >A six inch total application is anticipated over 3 months. > >Are there recommendations from this group concerning soil >moisture measurements or sensing at essentially the soil >surface? The circumstances were not really similar but I was looking at using the Theta probe to determine soil water changes at 4"(0.1 m) depth last summer. The crop was lettuce, which is quite sensitive following transplanting. At that time conditions remained quite moist. Several weeks later a deficit of about 20 mm developed and appeared to be tracked quite well by the Theta probe. I'd imagine that the Environscan would do a similar job. Theta probe and logger are attractive in being more compact and less susceptible to damage by field machinery. However, downloading of data from loggers appears not so straight forward. A 6mm application at about 18 mm deficit, together with some nitrogen (unfortunately from the experimental point of view), made a significant difference to final crop yield. regards Martin Parkes WasteTrim at Technology Transfer Centre, Alrick Building, Mayfield Road, Edinburgh EH9 3JL, SCOTLAND tel (44) 131 472 4708 fax (44) 131 662 4678