Modelling of tropical pasture growth using DairyMod: Model parameterisation and validation across multiple environments

Article

Jayasinghe, J.M.P., Pembleton, Keith G., Barber, David G., Donaghy, Daniel J. and Ramilan, Thiagarajah. 2024. "Modelling of tropical pasture growth using DairyMod: Model parameterisation and validation across multiple environments." European Journal of Agronomy. 156. https://doi.org/10.1016/j.eja.2024.127146
Article Title

Modelling of tropical pasture growth using DairyMod: Model parameterisation and validation across multiple environments

ERA Journal ID5307
Article CategoryArticle
AuthorsJayasinghe, J.M.P., Pembleton, Keith G., Barber, David G., Donaghy, Daniel J. and Ramilan, Thiagarajah
Journal TitleEuropean Journal of Agronomy
Journal Citation156
Article Number127146
Number of Pages13
Year2024
PublisherElsevier
Place of PublicationNetherlands
ISSN1161-0301
1873-7331
Digital Object Identifier (DOI)https://doi.org/10.1016/j.eja.2024.127146
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S1161030124000674
AbstractTropical forages are the primary feed source for livestock production in tropical and subtropical regions. Biophysical modelling has been an effective tool to explore the likely performances of forage species under different edaphoclimatic and agronomic management practices. The existing models are lacking in parameterised and validated tropical pastures, thus hindering their use for tropical and subtropical regions. The aims of this study were to parameterise the DairyMod, a mechanistic biophysical pasture model and robustly validate the species-specific parameters for the prediction of the growth of the three tropical pastures; Megathyrsus maximus ‘Gatton Panic’ (GP), Brachiaria ruziziensis x B. decumbens x B. brizantha ‘Brachiaria Mulato II’ (BM), and Chloris gayana ‘Rhodes grass cv. Reclaimer’ (RR). The model was calibrated using measurements of biomass components, canopy structure, and carbon assimilation collected from a field experiment at the Gatton Research Dairy Farm Queensland, Australia. The model was tested extensively using the published data from a diverse set of environments and management practices (16 data sets, 32 experiments, 14 different locations across South America, North America, Australia, and Africa). In the model parameterisation stage, DairyMod model predicted the aboveground biomass with good agreement for all tropical pastures with a high R2 of 0.92, 0.98, 0.74 and low RMSE of 341, 583, 848 kg DM ha–1 for BM, GP and RR, respectively. The model agreement was good for the validation data with R2 of 0.86, 0.80, 0.87 and RMSE of 954.5, 790.5, 633.2 kg DM ha–1 for the BM, GP and RR, respectively. The model predicted leaf and stem partitioning relatively poorly, and the model also struggled to simulate realistic pasture growth in Mediterranean and desert environments (R2 < 0.50). The study has improved the robustness and accuracy of DairyMod in relation to tropical pastures under tropical and subtropical climate conditions. Our robust and widely tested model can be successfully used for broader explorations of tropical pastures for improving livestock production systems in the tropics and subtropics, while calling for future improvement of the model accuracy in the areas of tropical pasture biomass partitioning, stubble dynamics and low temperature stress recovery function.
KeywordsBrachiaria Mulato II; Tropical pasture modelling ; Gatton panic ; Rhodes grass Reclaimer ; DairyMod
Contains Sensitive ContentContains sensitive content
ANZSRC Field of Research 2020300403. Agronomy
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Byline AffiliationsMassey University, New Zealand
Uva Wellassa University of Sri Lanka, Sri Lanka
Centre for Sustainable Agricultural Systems
School of Agriculture and Environmental Science
University of Queensland
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Pembleton, K. G.. 2015. "Plantain and chicory could potentially complement the perennial ryegrass dominant dairy feedbase." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Hobart.
Comparing within paddock yield variability of perennial ryegrass monocultures and perennial ryegrass, white clover and plantain mixtures using yield mapping
McLaren, David K. and Pembleton, Keith G.. 2015. "Comparing within paddock yield variability of perennial ryegrass monocultures and perennial ryegrass, white clover and plantain mixtures using yield mapping." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
Effect of defoliation management on expression of the ‘high sugar’ cultivar trait in Tasmania
Turner, Lydia R., Donaghy, Daniel J, Pembleton, Keith G. and Rawnsley, Richard P. 2013. "Effect of defoliation management on expression of the ‘high sugar’ cultivar trait in Tasmania." 22nd International Grassland Congress: Revitalising Grasslands to Sustain Our Communities. Sydney, Australia 15 - 19 Sep 2013 Australia.
Effect of nitrogen fertiliser applications on botanical composition
Turner, Lydia R., Donaghy, Daniel J., Pembleton, Keith G. and Rawnsley, Richard P.. 2013. "Effect of nitrogen fertiliser applications on botanical composition." 22nd International Grassland Congress: Revitalising Grasslands to Sustain Our Communities. Sydney, Australia 15 - 19 Sep 2013 Australia.
Impact of grazing on the silage yield of forage oat crops
Pembleton, Keith G., Harrison, Matthew T. and Rawnsley, Richard P.. 2013. "Impact of grazing on the silage yield of forage oat crops." 22nd International Grassland Congress: Revitalising Grasslands to Sustain Our Communities. Sydney, Australia 15 - 19 Sep 2013 Australia.
Early sowing and irrigating of rape crops in cool temperate environments boosts forage yield potential
Harrison, Matthew T., Pembleton, Keith G. and Rawnsley, Richard P.. 2013. "Early sowing and irrigating of rape crops in cool temperate environments boosts forage yield potential." 22nd International Grassland Congress: Revitalising Grasslands to Sustain Our Communities. Sydney, Australia 15 - 19 Sep 2013 Australia.
Frost risk associated with growing maize for silage on Tasmanian dairy farms
Pembleton, Keith. 2012. "Frost risk associated with growing maize for silage on Tasmanian dairy farms." Rawnsley RP (ed.) 16th Australian Agronomy Conference: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy (ASA 2012). Armidale, Australia 14 - 18 Oct 2012 Armidale, Australia.
Partitioning of taproot constituents and crown bud development are affected by water deficit in regrowing alfalfa (Medicago sativa L.)
Pembleton, Keith G., Volenec, Jeffrey J., Rawnsley, Richard P. and Donaghy, Daniel J.. 2010. "Partitioning of taproot constituents and crown bud development are affected by water deficit in regrowing alfalfa (Medicago sativa L.)." Crop Science: a journal serving the international community of crop scientists. 50 (3), pp. 989-999. https://doi.org/10.2135/cropsci2009.03.0140
Yield, yield components and shoot morphology of four contrasting lucerne (Medicago sativa) cultivars grown in three cool temperate environments
Pembleton, K. G., Donaghy, D. J., Volenec, J. J., Smith, R. S. and Rawnsley, R. P.. 2010. "Yield, yield components and shoot morphology of four contrasting lucerne (Medicago sativa) cultivars grown in three cool temperate environments." Crop and Pasture Science. 61 (6), pp. 503-511. https://doi.org/10.1071/CP09351
Genotype by environment interactions of lucerne (Medicago sativa L.) in a cool temperate climate
Pembleton, K. G., Smith, R. S., Rawnsley, R. P., Donaghy, D. J. and Humphries, A. W.. 2010. "Genotype by environment interactions of lucerne (Medicago sativa L.) in a cool temperate climate." Crop and Pasture Science. 61 (6), pp. 493-502. https://doi.org/10.1071/CP09269
Effect of summer irrigation on seasonal changes in taproot reserves and the expression of winter dormancy/activity in four contrasting lucerne cultivars
Pembleton, K. G., Cunningham, S. M. and Volenec, J. J.. 2010. "Effect of summer irrigation on seasonal changes in taproot reserves and the expression of winter dormancy/activity in four contrasting lucerne cultivars." Crop and Pasture Science. 61 (11), pp. 873 - 884. https://doi.org/10.1071/CP10030
Utilising leaf number as an indicator for defoliation to restrict stem growth in rhodes grass (Chloris gayana) cv. Callide
Pembleton, K.G., Lowe, K.F. and Bahnisch, L.M.. 2009. "Utilising leaf number as an indicator for defoliation to restrict stem growth in rhodes grass (Chloris gayana) cv. Callide." Tropical Grasslands. 43, pp. 79-85.
Water deficit alters canopy structure but not photosynthesis in regrowing alfalfa (Medicago sativa L.)
Pembleton, Keith, Rawnsley, Richard P., Donaghy, Daniel J. and Volenec, Jeffrey J.. 2009. "Water deficit alters canopy structure but not photosynthesis in regrowing alfalfa (Medicago sativa L.)." Crop Science: a journal serving the international community of crop scientists. 49 (2), pp. 722-731. https://doi.org/10.2135/cropsci2008.08.0456
Effect of defoliation interval and height on the growth and quality of Arachis pintoi cv. Amarillo
Sinclair, K., Lowe, K.F. and Pembleton, K.G.. 2007. "Effect of defoliation interval and height on the growth and quality of Arachis pintoi cv. Amarillo." Tropical Grasslands. 41 (4), pp. 260-268.
Potential of tropical forages for the Tasmanian dairy industry
Pembleton, Keith, Rawnsley, Richard, Donaghy, Danny and Chamberlain, Peter. 2006. "Potential of tropical forages for the Tasmanian dairy industry." 13th Australian Agronomy Conference 2006. Perth, Australia 10 - 14 Sep 2006 Australia. Australian Society of Agronomy.