- Title
- Germination ecology of hairy fleabane (Conyza bonariensis) and its implications for weed management
- Creator
- Loura, Deepak; Sahil; Florentine, Singarayer; Chauhan, Bhagirath
- Date
- 2020
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/173308
- Identifier
- vital:14658
- Identifier
-
https://doi.org/10.1017/wsc.2020.28
- Identifier
- ISBN:0043-1745
- Abstract
- Hairy fleabane [Conyza bonariensis(L.) Cronquist] is a problematic weed in Australian no-till cropping systems. Consequently, a study was conducted to examine the effect of temperature, light, salt stress, osmotic stress, burial depth, and sorghum crop residue on germination and emergence in two populations (C and W: collected from chick pea [Cicer arietinumL.] and wheat [Triticum aestivumL.] fields, respectively) ofC. bonariensis. Both populations were able to germinate over a wide range of alternating day/night temperatures (15/5 to 35/25 C); however, the C population had optimum (and similar) germination over the range of 20/10 and 30/20 C, while the W population showed maximum germination at 25/15 C. A negative relationship was observed between osmotic potential and germination, with 31% and 14% germination of the C and W populations at -0.6 MPa, respectively. These observations suggest that population C was more tolerant to higher osmotic potentials than population W. Seeds of both populations germinated when exposed to a wide range of sodium chloride levels (NaCl, 0 to 200 mM); however, beyond 200 mM NaCl, no germination was observed in either population. Maximum germination of the C (70%) and W (41%) populations was observed on the soil surface with no emergence from a burial depth of 1 cm. The application of sorghum residue at an amount of 6,000 kg ha(-1)reduced emergence of the C and W populations by 55% and 58%, respectively, compared with the no-residue treatment. Knowledge gained from this study suggests that the following strategies could be used for more efficacious management ofC. bonariensis: (1) a shallow-tillage operation to bury weed seeds in conventional tillage systems, and (2) retention of sorghum residue on the soil surface in no-till systems.
- Relation
- Weed Science Vol. 68, no. 4 (Jul 2020), p. 411-417
- Rights
- Copyright © Weed Science Society of America 2020
- Rights
- This metadata is freely available under a CCO license
- Subject
- 0703 Crop and Pasture Production; Burial depth; Emergence; Light; Seed; Sorghum residue; Temperature; Weed; Ecology; Environmental-factors; Sorghum; Persistence; Wheat
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