Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 4217 IREC Farmers' Newsletter No. 196 — Summer 2016 events). The irrigation treatments began after the fourth irrigation and continued until the end of the irrigation season. Irrigation frequency of the two treatments was based on: 1.  standard grower irrigation practice (average 45 kPa matric potential) 2.  reduced or short irrigation deficit (average 30 kPa matric potential). Matric potential was monitored in each bay by installing two Watermark sensors at 5, 15, 30 and 45 cm depth. Average measurements at 15 cm were used for scheduling the irrigations. A nitrogen application rate of 218 kg N /ha was calculated using a nitrogen budget for the site. Nitrogen was applied as urea and the two application strategies were: 1.  ‘up-front’ where 75% of the total nitrogen was applied prior to planting and the remainder was water-run in-crop during the third irrigation event (16 December) 2.  ‘split’ where 40% of the total rate was applied prior to planting and the remainder was water-run in-crop during the third and fourth (25 December) irrigation events. Whole plants from 2 metres of plant row at six locations across each bay were taken at establishment (i.e. 7-leaf stage) and physiological maturity. The samples were analysed to determine nitrogen uptake. Each bay was harvested with a commercial header and the harvested grain unloaded into a weigh bin to determine yield, before being loaded into a truck for delivery. Crop nitrogen uptake and yield Crop nitrogen uptake at establishment, when irrigation treatments had not yet been imposed, was not influenced by nitrogen management strategies, with an average crop nitrogen uptake of 32 kg N/ha. At physiological maturity there was a significant effect on crop nitrogen uptake from each of the irrigation and nitrogen treatments, as well as a significant interaction between the two. Crop nitrogen uptake at physiological maturity increased from 149 to 167 kg N/ha (LSD, P=0.06) by reducing the irrigation interval from 45 to 30 kPa (average) matric potential. Similarly, crop nitrogen uptake increased from 140 to 176 kg N/ha (LSD, P