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 42 Page 43 Page 4415 IREC Farmers' Newsletter No. 197 — Autumn 2017 Table 3. Grain yield, oil content and crop lodging response to nitrogen treatments in the irrigated canola experiment at Leeton in 2016. The experimental nitrogen treatments (Table 2) included various rates of urea applied at visible buds (as the canola plant begins to elongate before flowering). The topdressed nitrogen treatments were surface applied by hand. The total nitrogen available varied between treatments and ranged from 150 kg N/ha at the lowest rate to 300 kg N/ha at the highest rate. Crop performance Grain yield Grain yield averaged 3.70 t/ha across all treatments. Pioneer 45Y88 (CL) yielded significantly higher than all other varieties (4.47 t/ha), followed by Nuseed Diamond (4.09 t/ha), which was statistically similar to Pioneer 45Y25 (RR) and Hyola 577CL. ATR-Bonito was the lowest yielding variety (3.24 t/ha) but was statistically similar to Hyola 559TT, ATR-Gem and Victory V3002 (Figure 1). Oil content Grain oil content averaged 45.86% across all variety and nitrogen treatments. Pioneer 45Y88 (CL) had the highest oil content (46.69%) but was statistically similar to Pioneer 45Y25 (RR), Hyola 559TT, AV-Garnet, Nuseed Diamond, Hyola 575CL and ATR-Bonito. Victory V3002 had the lowest oil content (44.51%) but was statistically similar to Nuseed GT- 50 (Figure 2). Lodging Lodging was assessed on 22 November using a scale of 0 to 9, with 0 indicating no lodging and 9 indicating the plants were horizontal. Hyola 600RR had the most severe lodging with an average score of 4.40 but was statistically similar to AV-Garnet, Nuseed GT-50 and Hyola 559TT. Pioneer 45Y88 (CL) had significantly less lodging than all other varieties with a score of 0.33 (Figure 3). Nitrogen response The high nitrogen treatment (250 kg N/ha) resulted in the highest average yield (3.85 t/ha) but was statistically similar to the medium (200 kg N/ha) and very high (300 kg N/ha) nitrogen treatments. The low nitrogen treatment (150 kg N/ha) was significantly lower yielding (3.46 t/ha) than all other nitrogen treatments (Table 3). The low nitrogen treatment gave the highest oil content (46.91%) but was statistically similar to the medium nitrogen treatment. The very high nitrogen treatment was significantly lower in oil content (44.39%) than all other nitrogen treatments (Table 3). The low nitrogen treatment had significantly less lodging (score of 1.34) than all other nitrogen treatments. The very high nitrogen treatment had significantly more lodging (score of 4.31) than all other nitrogen treatments (Table 3). Treatment Grain yield (t/ha) Oil content (%) Lodging score (0-9) Low (150 kg N/ha) 3.46 a 46.91 a 1.34 a Medium (200 kg N/ha) 3.72 b 46.73 a 2.00 b High (250 kg N/ha) 3.85 b 45.41 b 3.60 c Very high (300 kg N/ha) 3.79 b 44.39 c 4.31 d Trial mean 3.70 45.86 1.25 l.s.d. (P