Mariano Cossani1, 2, Andrew Ware2, Victor O. Sadras1
1 SARDI, Waite Building 11a Hartley Grove, Adelaide, SA, 5001, http://pir.sa.gov.au/research , firstname.lastname@example.org
2 SARDI, 1 Hinmarsh St., Port Lincoln, SA, 5606
The co-limitation approach has mainly been used in ecological studies. Fewer studies tested co-limitation in crops, providing insights into the link between water and N co-limitation and yield gaps in rainfed wheat. The current work analysed a set of modern and old wheat cultivars in terms of water and N co-limitation in a low rainfall location of Eyre Peninsula. The objective was to improve the understanding in water and N economy of wheat crops, and to test the co-limitation theory using an empirical approach under experimental field conditions. Results indicated genetic gains in wheat yields are associated with better resource use efficiency mostly driven by a higher capacity of N uptake per each mm of water used and improved root systems.