Farm Table says:
The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.
- Sowing time for sorghum can be moved earlier than the traditional 16-18 °C soil temperature threshold without significant negative impact on crop establishment and grain yield
- At temperatures of 12°C or greater at sowing depth and good soil moisture at sowing depth, 70% or greater of the target population is usually achieved
- Testing for seed vigour prior to planting is fundamental as seed lot quality, rather than genetics, is the main driver for establishing a sorghum crop into colder soils.
Figure 2. Sorghum establishment conditions for the Emerald trials over the past 3 years. The blue bars indicate 10-day average soil temperature at 8am after sowing, the grey bars indicate average air temperature at 8 am 10 days after sowing and the orange line shows percentage establishment of the target population.