Sorghum And Maize – Avoiding Yield Loss To Heat At Grain Fill Through Agronomy And Changing The Sowing Window

GRDC - Loretta Serafin, Mark Hellyer, Annie Warren and Andrew Bishop, NSW DPI Tamworth

Type: Research Paper
Knowledge level: Advanced

Farm Table says:

The authors of this paper note in the conclusion: “The inclusion of final plant, grain yield and quality data from the three trial sites will add significant information to allow interpretation of the value of these treatments. It is important to consider that this data is only from one season so additional years data will add to the value of this dataset”.   Please access the full paper via the link below if this research interests you.

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.

Take home messages from the paper include:

Sorghum

  • Sorghum emerged in 2017 at cold soil temperatures (~ 8°C at Breeza) but establishment percentages were low. The first time of sowing (TOS1) was 57% of the established population of the third time of sowing (TOS3).
  • Plants were still emerging 47 days post sowing of the very early sowing time (TOS1).
  • The very early and early sowing times (TOS 1 and 2) resulted in patchy, uneven plant stands which were more prone to weed competition.
  • The very early and early sowing times did not achieve the target plant population of 50,000 plants/ha.
  • Sowing deeper (~7-8 cm) resulted in higher establishment losses compared to the shallow sowing.
  • There were differences in the establishment between hybrids, however these were often not consistent across sites and times of sowing.
  • High quality seed; germination and vigour; is required to achieve the best results – especially under colder soil temperatures.

Maize

  • Maize establishment in 2017 was delayed at TOS 1 and 2 by sowing into cold soil temperatures
    (~ 8°C and ~10°C at the Breeza site) but final plant populations were comparable to sowing into warmer soil temperatures.
  • There was no difference in the establishment of the three hybrids in this experiment.

2018 - Australia - GRDC - Loretta Serafin, Mark Hellyer, Annie Warren and Andrew Bishop, NSW DPI Tamworth
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