Abstract
No study has defined how the comparative adaptation of agricultural and weed species to aluminium and manganese toxicity may influence plant competition in acid soils. Root growth data from glasshouse and laboratory investigations were used in a non-linear dose response model to define the relative tolerance of some common agricultural, native and weed species to toxic concentrations of aluminium and manganese ions. One ryegrass ecotype was highly tolerant to both toxicities, Austrodanthonia linkii was highly susceptible and several weed species were tolerant. In addition, a rapid bioassay procedure was developed and used to broaden the range of plant species/cultivars evaluated for plant tolerance to Ca2+, H+ and Al3+. Another glasshouse experiment demonstrated that annual ryegrass (Lolium rigidum) ecotypes taken from soil types that were either acid (pH 3.7, 2.34 µg/mL Al3+) or alkaline (pH 8.2, 0.01 µg/mL Al3+) regulated the level of their competition with sensitive phalaris (cv. Sirolan, suppressed) or tolerant cocksfoot (cv. Porto, not suppressed). These results indicated the potential difficulty of establishing a sensitive plant type on acid soils if an adapted competitor also is present as a weed.
| Original language | English |
|---|---|
| Title of host publication | System Solutions for Complex Problems |
| Subtitle of host publication | Proceedings of the 20th Australian Agronomy Conference, Toowoomba Queensland, 18-22 September 2022 |
| Publisher | Australian Society of Agronomy |
| Number of pages | 4 |
| Edition | 20 |
| Publication status | Published - 2022 |
| Event | 20th Australian Agronomy Conference - Empire Theatre, Toowoomba, Australia Duration: 18 Sept 2022 → 22 Sept 2022 https://agronomyconference.com/ https://www.agronomyaustraliaproceedings.org/index.php/2022 (Proceedings) https://az659834.vo.msecnd.net/eventsairseasiaprod/production-expertevents-public/8313fc094e3043ceadc259e62364da10 (Program) |
Conference
| Conference | 20th Australian Agronomy Conference |
|---|---|
| Abbreviated title | System solutions for complex problems |
| Country/Territory | Australia |
| City | Toowoomba |
| Period | 18/09/22 → 22/09/22 |
| Other | The theme of the conference is System Solutions for Complex Problems. The theme underpins the need to strengthen collaborations between practitioners and researchers from a wide range of disciplinary backgrounds to address increasingly complex problems and uncertainties. So, the question is not If, but when and how, multidisciplinary collaborations will be developed. The 20th Australian Agronomy Conference will feature leading international and national speakers addressing issues such as the need to foster soil biology for enduring profitability, carbon sequestration, herbicide resistance, and the interwoven relationships between food production, energy and the environment. We will discuss and share our latest research findings amongst circa 300 agronomists from Australia and the world, as well as farmers, consultants, agribusinesses and farmer peak bodies. |
| Internet address |