Publication Date
1989
Description
Annual medics improve production and quality of herbage in winter and are naturalised in inland eastern Australia to lat. 24° S. In southern inland Queensland (lat. 24 to 29 °S, mean annual rain 500 to 800 mm with two-thirds in summer), productivity of the summer-growing grass pasture is limited by rainfall and soil N in summer, and by low temperature and frost in winter. Thus, I tested medic as a self-regenerating winter forage component. Because rainfall is highly variable in our region, I also used rainfall over the past 120 years to estimate the production of medics and so provide a broader view of their adaptation and productivity. To help investigate medic adaptation in marginal areas, this paper derives regression models for predicting both yields ( dry matter and seed) and N-fixation of medic from winter rainfall.
Citation
Clarkson, N M., "Regression Models to Assess Adapatation of Annual Medics (Medicago spp.) in Semi-Arid Subtropical Australia" (2025). IGC Proceedings (1989-2023). 22.
https://uknowledge.uky.edu/igc/1989/session13b/22
Included in
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Regression Models to Assess Adapatation of Annual Medics (Medicago spp.) in Semi-Arid Subtropical Australia
Annual medics improve production and quality of herbage in winter and are naturalised in inland eastern Australia to lat. 24° S. In southern inland Queensland (lat. 24 to 29 °S, mean annual rain 500 to 800 mm with two-thirds in summer), productivity of the summer-growing grass pasture is limited by rainfall and soil N in summer, and by low temperature and frost in winter. Thus, I tested medic as a self-regenerating winter forage component. Because rainfall is highly variable in our region, I also used rainfall over the past 120 years to estimate the production of medics and so provide a broader view of their adaptation and productivity. To help investigate medic adaptation in marginal areas, this paper derives regression models for predicting both yields ( dry matter and seed) and N-fixation of medic from winter rainfall.
