Upscaling models, downscaling data or the right model for the right scale of application?

Keynote


Sparks, Adam H., Garrett, Karen A., Gilligan, Christopher A., Nelson, Andrew and Pembleton, Keith. 2018. "Upscaling models, downscaling data or the right model for the right scale of application?" 11th International Congress of Plant Pathology (ICPP 2018): Plant Health in a Global Economy. Boston, United States 29 Jul - 03 Aug 2018 United States.
Paper/Presentation Title

Upscaling models, downscaling data or the right model for the right scale of application?

Presentation TypeKeynote
AuthorsSparks, Adam H. (Author), Garrett, Karen A. (Author), Gilligan, Christopher A. (Author), Nelson, Andrew (Author) and Pembleton, Keith (Author)
Number of Pages1
Year2018
Place of PublicationUnited States
Web Address (URL) of Paperhttps://apsnet.confex.com/apsnet/ICPP2018/meetingapp.cgi/Paper/4005
Conference/Event11th International Congress of Plant Pathology (ICPP 2018): Plant Health in a Global Economy
Event Details
11th International Congress of Plant Pathology (ICPP 2018): Plant Health in a Global Economy
Event Date
29 Jul 2018 to end of 03 Aug 2018
Event Location
Boston, United States
Abstract

Plant epidemiological models are used in a range of applications, from detailed simulation models that closely follow pathogen infection and dispersal, to generic template-based models for rapid assessment of invasive species. There is increasing interest in applying small scale models - e.g., based on tissue, organ or whole plants - using remotely collected daily data, to generate regional risk information (e.g., maps). The assumption made is that such small scale models “scale-up” appropriately to regional, continental or even global scale. However, these models are often constructed using locally collected, hourly data. By necessity data available are often at much coarser scale, both temporally and spatially, than the data used to develop the model. Computational requirements increase considerably when more detailed models that require fine resolution data (if available) are applied to large areas, while small scale models often add little useful information at these scales and may lead to error propagation. Ideally, detailed models should be used at small temporal and spatial scales and less detailed models used for larger temporal and spatial scales. This paper presents examples of different approaches for changing scales - including upscaling models, downscaling data, and developing new models - and the issues that these approaches create or solve, along with ideas about how we can ensure that the scale of model and data match the desired application.

Keywordsplant epidemiological models
ANZSRC Field of Research 2020300206. Agricultural spatial analysis and modelling
310805. Plant pathology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
Byline AffiliationsCentre for Crop Health
University of Florida, United States
University of Cambridge, United Kingdom
University of Twente, Netherlands
School of Agricultural, Computational and Environmental Sciences
Institution of OriginUniversity of Southern Queensland
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Gacenga, Francis, Sparks, Adam and Del Ponte, Emerson M.. 2019. "Open Data, Materials and Code Introduction." Panczack, R., Gacenga, F., Sparks, A., King, R., Baker, P., Li, L., Schnyder, N., Lim, C. and Vickers-Jones, R. (ed.) Re:Produce Workshop - A Theo Murphy Initiative. Brisbane, Australia 10 - 11 Dec 2019 Australia. https://doi.org/10.17605/OSF.IO/XQ7C5
Potential of summer-active temperate (C3) perennial forages to mitigate the detrimental effects of supraoptimal temperatures on summer home-grown feed production in south-eastern Australian dairying regions
Langworthy, Adam D., Rawnsley, Richard P., Freeman, Mark J., Pembleton, Keith G., Corkrey, Ross, Harrison, Matthew T., Lane, Peter A. and Henry, David A.. 2018. "Potential of summer-active temperate (C3) perennial forages to mitigate the detrimental effects of supraoptimal temperatures on summer home-grown feed production in south-eastern Australian dairying regions." Crop and Pasture Science. 69 (8), pp. 808-820. https://doi.org/10.1071/CP17291
Re-visiting management options for charcoal rot in sorghum [eXtension AUS Field Crop Diseases, 19 March 2018 - Online community]
Adorada, Dante, Vaghefi, Niloofar and Sparks, Adam. 2018. "Re-visiting management options for charcoal rot in sorghum [eXtension AUS Field Crop Diseases, 19 March 2018 - Online community]." eXtension AUS Field Crop Diseases. 19 March 2018, pp. 1-8.
PREDICTA®B update and new tests for 2018
McKay, Alan, Simpfendorfer, Steven, Gupta, Vadakattu, Bithell, Sean, Moore, Kevin, Daniel, Richard, Percy, Cassy, White, Jo, Sparks, Adam and Hollaway, Grant. 2018. "PREDICTA®B update and new tests for 2018." GRDC Update Papers.
Spatial and temporal patterns of rice production and productivity
Kannan, Elumalai, Paliwal, Ambica and Sparks, Adam. 2017. "Spatial and temporal patterns of rice production and productivity." Mohanty, Samarendu, Chengappa, P. G., Mruthyunjaya, Mruthyunjaya, Ladha, J. K., Baruah, Sampriti, Kannan, Elumalai and Manjuataha, A. V. (ed.) The future rice strategy for India. London, United Kingdom. Elsevier. pp. 39-68
Diagnosing plant diseases: what do we ask and why do we ask for it?
Adorada, Dante L., Sigel, Luise, Kelly, Lisa and Sparks, Adam H.. 2017. "Diagnosing plant diseases: what do we ask and why do we ask for it?" GRDC Extension AUS. 4 (8).
Modelling forage yield and water productivity of continuous crop sequences in the Argentinian Pampas
Ojeda, J. J., Pembleton, K. G., Caviglia, O. P., Islam, M. R., Agnusdei, M. G. and Garcia, S. C.. 2018. "Modelling forage yield and water productivity of continuous crop sequences in the Argentinian Pampas." European Journal of Agronomy. 92, pp. 84-96. https://doi.org/10.1016/j.eja.2017.10.004
Quantifying the interactions between defoliation interval, defoliation intensity and nitrogen fertiliser application on the nutritive value of rainfed and irrigated perennial ryegrass
Pembleton, K. G., Rawnsley, R. P., Turner, L. R., Corkrey, R. and Donaghy, D. J.. 2017. "Quantifying the interactions between defoliation interval, defoliation intensity and nitrogen fertiliser application on the nutritive value of rainfed and irrigated perennial ryegrass." Crop and Pasture Science. 68 (12), pp. 1100-1111. https://doi.org/10.1071/CP16385
Mungbean and sorghum disease update
Kelly, Lisa, White, Jo, Sharman, Murray, Brier, Hugh, Williams, Liz, Grams, Raechelle, Weir, Duncan, McKay, Alan and Sparks, Adam H.. 2017. "Mungbean and sorghum disease update." GRDC Grains Research Update (Jondaryan) (2017). Jondaryan, Australia 19 Jul 2017 Hornsby, NW, Australia.
bomrang: fetch Australian Government Bureau of Meteorology data in R [Journal of Open Source Software, vol. 2, no. 17, 411]
Sparks, Adam H., Padgham, Mark, Parsonage, Hugh and Pembleton, Keith. 2017. bomrang: fetch Australian Government Bureau of Meteorology data in R [Journal of Open Source Software, vol. 2, no. 17, 411]. Baltimore, Maryland, United States. NumFOCUS. https://doi.org/10.21105/joss.00411
Modelling of lucerne (Medicago sativa L.) for livestock production in diverse environments
Smith, Andrew P., Moore, Andrew D., Boschma, Suzanne P., Hayes, Richard C., Nie, Zhongnan and Pembleton, Keith G.. 2017. "Modelling of lucerne (Medicago sativa L.) for livestock production in diverse environments." Crop and Pasture Science. 68 (1), pp. 74-91. https://doi.org/10.1071/CP16176
Crop health and its global impacts on the components of food security
Savary, S., Bregaglio, S., Willocquet, L., Gustafson, D., Mason D'Croz, D., Sparks, A., Castilla, N., Djurle, A., Allinne, C., Sharma, Mamta, Rossi, V., Amorim, L., Bergamin, A., Yuen, J., Esker, P., McRoberts, Neil, Avelino, J., Duveiller, E., Koo, J. and Garrett, K.. 2017. "Crop health and its global impacts on the components of food security." Food Security: the science, sociology and economics of food production and access to food. 9 (2), pp. 311-327. https://doi.org/10.1007/s12571-017-0659-1
Plant pathogens as indicators of climate change
Garrett, K. A., Nita, M., De Wolf, E. D., Esker, P. D., Gomez-Montano, L. and Sparks, A. H.. 2016. "Plant pathogens as indicators of climate change." Letcher, Trevor M. (ed.) Climate change: observed impacts on planet Earth. Netherlands. Elsevier. pp. 325-338
Is rice improvement still making a difference? Assessing the economic, poverty and food security impacts of rice varieties released from 1989 to 2009 in Bangladesh, Indonesia and the Philippines
Raitzer, D. A., Sparks, A. H., Huelgas, Z., Maligalig, R., Balangue, Z., Launio, C., Daradjat, A. and Ahmed, H. U.. 2015. Is rice improvement still making a difference? Assessing the economic, poverty and food security impacts of rice varieties released from 1989 to 2009 in Bangladesh, Indonesia and the Philippines. Rome, Italy. CGIAR Independent Science and Partnership Council.
DAQ00186 2015 annual report
Sparks, Adam H., Kelly, Lisa, Sharman, Murray, Thompson, Sue, Wenham, Kylie and White, Jo. 2016. DAQ00186 2015 annual report. Australia. Grains Research and Development Corporation.
An introduction to key distributions and models in epidemiology using R
Garrett, Karen A., Esker, Paul D. and Sparks, Adam H.. 2015. "An introduction to key distributions and models in epidemiology using R." Stevenson, Katherine L. and Jeger, Michael J. (ed.) Exercises in plant disease epidemiology. St. Paul, Minnesota. American Phytopathological Society. pp. 3-14
getCRUCLdata: use and explore CRU CL v. 2.0 climatology elements in R
Sparks, Adam H.. 2017. getCRUCLdata: use and explore CRU CL v. 2.0 climatology elements in R. https://cran.r-project.org/package=getCRUCLdata. Comprehensive R Archive Network. https://doi.org/10.21105/joss.00230
GSODR: Global Summary Daily Weather Data in R
Sparks, Adam H., Hengl, Tomislav and Nelson, Andrew. 2017. GSODR: Global Summary Daily Weather Data in R. https://cran.r-project.org/package=GSODR. Comprehensive R Archive Network. https://doi.org/10.21105/joss.00177
Spatial modelling of rice yield losses in Tanzania due to bacterial leaf blight and leaf blast in a changing climate
Duku, Confidence, Sparks, Adam H. and Zwart, Sander J.. 2016. "Spatial modelling of rice yield losses in Tanzania due to bacterial leaf blight and leaf blast in a changing climate." Climatic Change: an interdisciplinary, international journal devoted to the description, causes and implications of climatic change. 135 (3-4), pp. 569-583. https://doi.org/10.1007/s10584-015-1580-2
Decision tools for bacterial blight resistance gene deployment in rice-based agricultural ecosystems
Dossa, Gerbert S., Sparks, Adam, Vera Cruz, Cassiana and Oliva, Ricardo. 2015. "Decision tools for bacterial blight resistance gene deployment in rice-based agricultural ecosystems." Frontiers in Plant Science. 6, pp. 1-5. https://doi.org/10.3389/fpls.2015.00305
Climate change may have limited effect on global risk of potato late blight
Sparks, Adam H., Forbes, Gregory A., Hijmans, Robert J. and Garrett, Karen A.. 2014. "Climate change may have limited effect on global risk of potato late blight." Global Change Biology. 20 (12), pp. 3621-3631. https://doi.org/10.1111/gcb.12587
A review on crop losses, epidemiology and disease management of rice brown spot to identify research priorities and knowledge gaps
Barnwal, M. K., Kotasthane, A., Magculia, N., Mukherjee, P. K., Savary, S., Sharma, A. K., Singh, H. B., Singh, U. S., Sparks, A. H., Variar, M. and Zaidi, N.. 2013. "A review on crop losses, epidemiology and disease management of rice brown spot to identify research priorities and knowledge gaps." European Journal of Plant Pathology. 136 (3), pp. 443-457. https://doi.org/10.1007/s10658-013-0195-6
Taking transgenic rice drought screening to the field
Gaudin, Amelie C. M., Henry, Amelia, Sparks, Adam H. and Slamet-Loedin, Inez H.. 2013. "Taking transgenic rice drought screening to the field." Journal of Experimental Botany. 64 (1), pp. 109-117. https://doi.org/10.1093/jxb/ers313
An economic assessment of the impact of mango pulp weevil on the agricultural sector of Palawan, Philippines
McKinley, Justin D., Sparks, Adam H., Pede, Valerien O. and Duff, Bart. 2012. "An economic assessment of the impact of mango pulp weevil on the agricultural sector of Palawan, Philippines." The Philippine Agricultural Scientist: an international journal of tropical agriculture and related sciences. 95 (3), pp. 286-292.
Complexity in climate-change impacts: an analytical framework for effects mediated by plant disease
Garrett, K. A., Forbes, G. A., Savary, S., Skelsey, P., Sparks, A. H., Valdivia, C., van Bruggen, A. H. C., Willocquet, L., Djurle, A., Duveiller, E., Eckersten, H., Pande, S., Vera Cruz, C. and Yuen, J.. 2011. "Complexity in climate-change impacts: an analytical framework for effects mediated by plant disease." Plant Pathology. 60 (1), pp. 15-30. https://doi.org/10.1111/j.1365-3059.2010.02409.x
International agricultural research tackling the effects of global and climate changes on plant diseases in the developing world
Savary, Serge, Nelson, Andrew, Sparks, Adam H, Willocquet, Laetitia, Duveiller, Etienne, Mahaku, George, Forbes, Greg, Garrett, Karen A., Hodson, David, Padgham, Jon, Pande, Suresh, Sharma, Mamta, Yuen, Jonathan and Djurle, Annika. 2011. "International agricultural research tackling the effects of global and climate changes on plant diseases in the developing world." Plant Disease: an international journal of applied plant pathology. 95 (10), pp. 1204-1216. https://doi.org/10.1094/PDIS-04-11-0316
A metamodeling framework for extending the application domain of process-based ecological models
Sparks, Adam H., Forbes, Gregory A., Hijmans, Robert and Garrett, Karen A.. 2011. "A metamodeling framework for extending the application domain of process-based ecological models." Ecosphere. 2 (8). https://doi.org/10.1890/ES11-00128.1
More milk from forage: Milk production, blood metabolites, and forage intake of dairy cows grazing pasture mixtures and spatially adjacent monocultures
Pembleton, Keith G., Hills, James L., Freeman, Mark J., McLaren, David K., French, Marion and Rawnsley, Richard P.. 2016. "More milk from forage: Milk production, blood metabolites, and forage intake of dairy cows grazing pasture mixtures and spatially adjacent monocultures." Journal of Dairy Science. 99 (5), pp. 3512-3528. https://doi.org/10.3168/jds.2015-10542
Yield and water-use efficiency of contrasting lucerne genotypes grown in a cool temperate environment
Pembleton, K. G., Rawnsley, R. P. and Donaghy, D. J.. 2011. "Yield and water-use efficiency of contrasting lucerne genotypes grown in a cool temperate environment." Crop and Pasture Science. 62 (7), pp. 610-623. https://doi.org/10.1071/CP11094
The morphological and physiological responses of perennial ryegrass (Lolium perenne L.), cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.; syn. Schedonorus phoenix Scop.) to variable water availability
Turner, L. R., Holloway-Phillips, M. M., Rawnsley, R. P., Donaghy, D. J. and Pembleton, K. G.. 2012. "The morphological and physiological responses of perennial ryegrass (Lolium perenne L.), cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.; syn. Schedonorus phoenix Scop.) to variable water availability." Grass and Forage Science. 67 (4), pp. 507-518. https://doi.org/10.1111/j.1365-2494.2012.00866.x
Environmental influences on optimum nitrogen fertiliser rates for temperate dairy pastures
Pembleton, Keith G., Rawnsley, Richard P. and Burkitt, Lucy L.. 2013. "Environmental influences on optimum nitrogen fertiliser rates for temperate dairy pastures." European Journal of Agronomy. 45, pp. 132-141. https://doi.org/10.1016/j.eja.2012.09.006
Evaluating the accuracy of the Agricultural Production Systems Simulator (APSIM) simulating growth, development, and herbage nutritive characteristics of forage crops grown in the south-eastern dairy regions of Australia
Pembleton, K. G., Rawnsley, R. P., Jacobs, J. L., Mickan, F. J., O'Brien, G. N., Cullen, B. R. and Ramilan, T.. 2013. "Evaluating the accuracy of the Agricultural Production Systems Simulator (APSIM) simulating growth, development, and herbage nutritive characteristics of forage crops grown in the south-eastern dairy regions of Australia." Crop and Pasture Science. 64 (2), pp. 147-164. https://doi.org/10.1071/CP12372
Complementary forages – integration at a whole-farm level
Rawnsley, R. P., Chapman, D. F., Jacobs, J. L., Garcia, S. C., Callow, M. N., Edwards, G. R. and Pembleton, K. P.. 2013. "Complementary forages – integration at a whole-farm level." Animal Production Science. 53 (9), pp. 976-987. https://doi.org/10.1071/AN12282
Quantifying the interactions between grazing interval, grazing intensity, and nitrogen on the yield and growth rate of dryland and irrigated perennial ryegrass
Rawnsley, R. P., Langworthy, A. D., Pembleton, K. G., Turner, L. R., Corkrey, R. and Donaghy, D. J.. 2014. "Quantifying the interactions between grazing interval, grazing intensity, and nitrogen on the yield and growth rate of dryland and irrigated perennial ryegrass." Crop and Pasture Science. 65 (8), pp. 735-746. https://doi.org/10.1071/CP13453
Opportunities and challenges in Australian grasslands: pathways to achieve future sustainability and productivity imperatives
Bell, Lindsay W., Hayes, Richard C., Pembleton, Keith G. and Waters, Cathy M.. 2014. "Opportunities and challenges in Australian grasslands: pathways to achieve future sustainability and productivity imperatives." Crop and Pasture Science. 65 (6), pp. 489-507. https://doi.org/10.1071/CP13420
Giving drought the cold shoulder: a relationship between drought tolerance and fall dormancy in an agriculturally important crop
Pembleton, Keith G. and Sathish, Puthigae. 2014. "Giving drought the cold shoulder: a relationship between drought tolerance and fall dormancy in an agriculturally important crop." AOB Plants. 6 (April), pp. 1-17. https://doi.org/10.1093/aobpla/plu012
Simple versus diverse pastures: opportunities and challenges in dairy systems
Pembleton, Keith G., Tozer, Katherine N., Edwards, Grant R., Jacobs, Joe L. and Turner, Lydia R.. 2015. "Simple versus diverse pastures: opportunities and challenges in dairy systems." Animal Production Science. 55 (7), pp. 893-901. https://doi.org/10.1071/AN14816
Longer defoliation interval ensures expression of the ‘high sugar’ trait in perennial ryegrass cultivars in cool temperate Tasmania, Australia
Turner, L. R., Donaghy, D. J., Pembleton, K. G. and Rawnsley, R. P.. 2015. "Longer defoliation interval ensures expression of the ‘high sugar’ trait in perennial ryegrass cultivars in cool temperate Tasmania, Australia." Journal of Agricultural Science. 153 (6), pp. 995-1005. https://doi.org/10.1017/S0021859614000628
Modelling the resilience of forage crop production to future climate change in the dairy regions of southeastern Australia using APSIM
Pembleton, K. G., Cullen, B. R., Rawnsley, R. P., Harrison, M. T. and Ramilan, T.. 2016. "Modelling the resilience of forage crop production to future climate change in the dairy regions of southeastern Australia using APSIM." The Journal of Agricultural Science. 154 (7), pp. 1131-1152. https://doi.org/10.1017/S0021859615001185
Evaluation of the agricultural production systems simulator simulating lucerne and annual ryegrass dry matter yield in the Argentine pampas and south-eastern Australia
Ojeda, J. J., Pembleton, K. G., Islam, M. R., Agnusdei, M. G. and Garcia, S. C.. 2016. "Evaluation of the agricultural production systems simulator simulating lucerne and annual ryegrass dry matter yield in the Argentine pampas and south-eastern Australia." Agricultural Systems. 143, pp. 61-75. https://doi.org/10.1016/j.agsy.2015.12.005
Production interactions between combinations of 4 perennial legumes and 5 perennial grasses, grown under high input management with and without applications of nitrogen
Smith, Rowan, Hall, Eric, Corkrey, Ross, Parsons, David, Pembleton, Keith and Rawnsley, Richard. 2015. "Production interactions between combinations of 4 perennial legumes and 5 perennial grasses, grown under high input management with and without applications of nitrogen." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
Summer production of alternative species in comparison to perennial ryegrass and white clover for high input pasture systems
Smith, Rowan, Hall, Eric, Corkrey, Ross, Parsons, David, Pembleton, Keith and Rawnsley, Richard. 2015. "Summer production of alternative species in comparison to perennial ryegrass and white clover for high input pasture systems." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
Stoloniferous red clover cv. Rubitas is a valuable companion to PRG and phalaris
Watson, Brigid, Pembleton, Keith, Smith, Rowan, Corkrey, Ross and Rawnsley, Richard. 2015. "Stoloniferous red clover cv. Rubitas is a valuable companion to PRG and phalaris." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
Chicory (Cichorium intybus L.) can beat the heat during summer drought in southeast Australian dairying regions
Langworthy, Adam, Pembleton, Keith, Rawnsley, Richard, Harrison, Matthew, Lane, Peter, Henry, David and Corkrey, Ross. 2015. "Chicory (Cichorium intybus L.) can beat the heat during summer drought in southeast Australian dairying regions." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
Response of the DCAD of plantain to potassium fertilisation
Pembleton, K. G, Hill, B. D. and Rawnsley, R. P.. 2015. "Response of the DCAD of plantain to potassium fertilisation." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australia.
APSIM Kale appropriately simulates spring and autumn grown forage kale crops in Tasmania
Pembleton, K.G, Harrison, M.T., Rawnsley, R.P., Zykowski, R., Chakwizira, E., de Ruiter, J. and Johnstone, P.R.. 2015. "APSIM Kale appropriately simulates spring and autumn grown forage kale crops in Tasmania." 17th Australian Agronomy Conference 2015: Building Productive, Diverse and Sustainable Landscapes (AAC 2015). Hobart, Australia 20 - 24 Sep 2015 Australlia.
Plantain and chicory could potentially complement the perennial ryegrass dominant dairy feedbase
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.