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.
- Current Australian wheat cultivars contain dwarfing genes that reduce coleoptile length by 40%. New dwarfing genes are available that reduce plant height but don’t reduce coleoptile length
- Deep-sowing studies in NSW and WA show benefit with new dwarfing genes in increasing emergence at sowing depths of up to 120mm but without changing plant height
- Moisture-seeking points coupled with new genetics should reliably allow seed placement and emergence from sowing depths of 100mm or greater, and/or in warmer soils which reduce coleoptile length
- Large, plump seed containing larger embryos should be used when sowing deep and/or where potential for soil crusting could impede seedling emergence.
Figure 1. Patterns of emergence of wheat genotypes with different dwarfing genes sown at target depths of 40, 80, or 120mm at Mullewa and Merredin in 2016 (after French et al. 2017).