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 4221 IREC Farmers' Newsletter No. 196 — Summer 2016 Variety results When averaged across all row spacings and targeted plant densities, the grain yields of both Djakal and N005A-80 were significantly higher than Bidgee. The highest yielding variety treatments were Djakal and N005A-80, both at 40 plant/m2 targeted plant density on 30 cm row spacing, with yields of 4.79 and 4.64 t/ha respectively (Figure 1). There was a significant interaction between variety and row spacing for peak dry matter production (Figure 2). Both Djakal and N005A-80 achieved their highest dry matter yield at the 60 cm row spacing; however there was no statistical difference between 30 and 60 cm in dry matter production for these varieties. Bidgee dry matter declined linearly with widening row spacing, with 90 cm row spacing significantly lower than 30 and 60 cm row spacing (Figure 2). Few changes in seed protein were found in response to row spacing and target plant density, but seed protein differed largely between varieties. When averaged across all row spacings and targeted plant densities, Djakal had a significantly lower protein concentration than both Bidgee and N005A-80, at 42.2, 45.2 and 46.1% respectively. Row spacing results When averaged across all varieties and targeted plant densities, the grain yield of treatments with the 30 cm row spacing was significantly higher than both the 60 and 90 cm row spacings, at 4.1, 3.6 and 3.3 t/ha respectively. 3.99 3.45 2.97 4.79 3.97 3.81 4.64 3.79 3.66 2.00 2.50 3.00 3.50 4.00 4.50 5.00 30 60 90 30 60 90 30 60 90 Bidgee Djakal N005A-80 Yield (t/ha) Variety x row spacing (30, 60, 90 cm) Figure 1. Soybean grain yield for variety x row spacing interaction at the 40 plants/m2 targeted plant density Figure 2. Soybean dry matter for variety x row spacing interaction at the 40 plants/m2 targeted plant density The experiment tested one new breeding line and two commercial varieties, planted at three row spacings and two targeted plant densities and irrigated by overhead sprinkler. 10.2 8.8 7.6 10.3 12.0 9.0 9.6 10.5 8.9 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 30 60 90 30 60 90 30 60 90 Bidgee Djakal N005A-80 Dry matter (t/ha) Variety x row spacing (30, 60, 90, cm) Table 1. Site details of overhead irrigation trial. Site details Location Finley, NSW Trial period Summer growing season 2014–15 Soil type Red brown, fine sandy clay loam over light clay Previous crop/s Wheat (stubble baled) Establishment irrigation Rainfall and post-sowing irrigation Irrigation method Overhead irrigation Sowing date 20 November 2014 Inoculation Water injected peat slurry Group H Fertiliser 125 kg/ha legume starter Herbicides pre-emergent Roundup® 450 @ 1.5 L/ha + trifluralin @1.6 L/ha Insecticides Indoxacarb 150 g/L @ 400 mL/ha by air In-crop rainfall 179 mm Irrigations 7.83 ML/ha Harvest date 15–16 April 2015 Table 2. Treatment details of overhead irrigation trial. Treatments Varieties Djakal, Bidgee, N005A-80 (unreleased breeding line) Row spacing 2 rows/plot (90 cm), 3 rows/plot (60 cm), 6 rows/plot (30 cm) Targeted plant density 25 plants/m2, 40 plants/m2 Variety x row spacing (30, 60, 90 cm) Variety x row spacing (30, 60, 90 cm) l.s.d.(P=0.05) = 1.88 t/ha l.s.d.(P=0.05) = 0.44 t/ha Yield (t/ha) Dry matter (t/ha)