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Fate of Avena sterilis ssp. ludoviciana seeds under different burial depths and wheat residue loads

Ali, M., Williams, A., Widderick, M. J. and Adkins, S. W. (2022) Fate of Avena sterilis ssp. ludoviciana seeds under different burial depths and wheat residue loads. In: Proceedings of the 20th Agronomy Australia Conference, 2022, 6 - 10 February 2022, Toowoomba Qld.

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Article Link(s): http://agronomyaustraliaproceedings.org/images/sam...

Abstract

Ludo wild oats (Avena sterilis ssp. ludoviciana) is a problematic winter weed across both conventional and conservation agriculture systems where soil disturbance and crop residue retention differ. To better understand its persistence, we compared the fate of primary and secondary seeds placed at 0, 2, 8, or 15 cm burial depths, and under 0, 2, or 3 t/ha wheat (Triticum aestivum L.) residue loads over a 16-month period. The experiment revealed both burial depth and wheat residue load affected the fate of both types of seed. Seedlings of primary and secondary seeds were able to emerge from 15 cm burial depth (17 %), however maximum emergence occurred from the 2 cm depth (71 %) and under 3 t/ha wheat residue (80 %). After 16 months, it was observed that 17 % of the primary and 24 % of the secondary seeds remained viable, but in a quiescent or dormant state. Burying seeds to a depth of >15 cm will be required to help prevent A. sterilis ssp. ludoviciana seedling emergence and possibly to reduce seed viability in the soil. When strategic tillage is applied, it will reduce the surface residue load and thereby reduce seedling emergence.

Item Type:Conference or Workshop Item (Paper)
Business groups:Crop and Food Science
Additional Information:Open access
Keywords:Conservation agriculture, reduced tillage, strategic tillage, wild oat emergence, wild oat viability
Subjects:Agriculture > Agriculture (General) > Agriculture and the environment
Agriculture > Agriculture (General) > Soils. Soil science > Soil and crops. Soil-plant relationships. Soil productivity
Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Agriculture > Agriculture (General) > Agricultural conservation
Plant culture > Field crops > Oats
Agriculture > By region or country > Australia > Queensland
Deposited On:24 Feb 2022 06:47
Last Modified:24 Feb 2022 06:49

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