To assess the impact of increased crop inputs, specifically nitrogen, phosphorus and manure, across various spring canola variety types.

• The high-input management strategy (225 kg/ha N + 30 kg/ha P + 5 t/ha chicken manure) resulted in yields 0.69 t/ha higher than the low-input approach (150 kg/ha N + 15 kg P/ha), reflecting a substantial 26% increase in yield.
• Yield differences within herbicide tolerance groups was greater than differences between herbicide tolerance groups.
• For oil concentration, the Glyphosate Tolerant (GT) varieties had higher oil than Clearfield (CLF) and Triazine Tolerant (TT) varieties.
• Hybrid Clearfield canola 45Y95 CL achieved the highest yield at 3.35 t/ha. This was 19% higher than the lowest yielding variety Hyola Blazer TT.
• Dry matter assessments were taken at 100°C.days and 500°C.days after the start of flowering and again at crop maturity. 45Y95 CL and 45Y28 RR had more biomass than HyTTec Trifecta by the second biomass assessment. This higher biomass was maintained through to maturity but resulted in lower harvest index (HI).
• Growth through the crop critical period (between 100 and 500°C.days after the start of flowering) was > 4 t/ha for 45Y95 CL and 45Y28 RR, but < 3 t/ha for HyTTec Trifecta. The difference in growth during the crop critical period likely drove the higher yield of these two varieties. Similarly, there was > 4 t/ha growth through the critical period with the High input nutrition strategy compared with < 3 t/ha for the low input strategy.
• Applying the extra nutrition and selecting the best hybrids were additive factors in achieving the highest yields in this trial.
• No significant interaction between variety and management strategy was observed for yield and biomass.

Trial design: Factorial

2022 Crop: Barley
Soil type & management: Sandy loam duplex
Available Nitrogen 0-40 cm: 67 kg/ha
Colwell P 0-10 cm: 28 mg/kg
pH (CaCl2) 0-20 cm: 5.6
Organic Carbon 0-20 cm: 2.8%