ORGANIZATIONS
Council of Grain Growers Organisations (COGGO)
https://www.coggo.net.au
Dept of Primary Industry and Regional Development
https://www.dpird.wa.gov.au/businesses/plant-and-crop-farming/grains/wheat/
has some online tools.
The "MyPaddock" one has, under "nutrition", N-fertilizer.
more about mypaddock
Katanning Research Station
https://www.dpird.wa.gov.au/research/laboratory-and-research-facilities/katanning-research-station/
(mostly about sheep ...)
East Australia
Birchip Cropping Group
https://www.bcg.org.au
GRDC Code: BWD2303-004BGX
ARG001 NRMI Nitrogen Decisions Project - BCG
REFERENCES
d'Abbadie, C, Kharel, S, Kingwell, R, and Abadi Ghadim, A. (2023), Profitable, low-emission nitrogen application strategies
in Western Australian dryland cropping. Crop and Pasture Science, 75 (1).
https://library.dpird.wa.gov.au/fc_researchart/38
christophe.dabbadie@dpird.wa.gov.au
sud.kharel@dpird.wa.gov.au
ross.kingwell@dpird.wa.gov.au
amir.abadighadim@dpird.wa.gov.au
https://grdc.com.au/resources-and-publications/grdc-update-papers/tab-content/grdc-update-papers/2024/02/back-to-nitrogen-basics-soil-testing-and-nitrogen-budgeting-fundamentals
Back to nitrogen basics – soil testing and nitrogen budgeting fundamentals
Author: James Hunt (The University of Melbourne) | Date: 06 Feb 2024
COGGO Research Fund project completed by Yuna Farm Improvement Group
This project sought to establish a stronger understanding of soil nitrogen supply and how this supply is affected by seasonal conditions.
The project also assessed the impact planting density can have on nitrogen leaching losses. The project treatments consisted of three nitrogen application rates (0N,25N, 80N) across two sowing densities (75kg/ha wheat, 150kg/ha wheat), for two seasons (2023,2024).
Date completed: March 2025
To find out more, please contact Nick Eyres, Committee Advisor, GSA yuna.fig@gmail.com
and Planfarm PTY LTD
https://library.dpird.wa.gov.au/cgi/viewcontent.cgi?article=2935&context=journal_agriculture4
Mason, M G. (1982) "Getting the best from fertiliser nitrogen," Journal of the Department of Agriculture, Western Australia,
Series 4: Vol. 23: No. 4, Article 8.
Available at: https://library.dpird.wa.gov.au/journal_agriculture4/vol23/iss4/8
Coupling decision of water and nitrogen application in winter wheat via UAV hyperspectral imaging
Xuguang SunBaoyuan ZhangZiyi Zhang[...]Xiaohe Gu
December 2025 Field Crops Research 334:110159
DOI: 10.1016/j.fcr.2025.110159
Various models and modeling systems, including APSIM (Keating et al., 2003;Holzworth et al., 2014), DSSAT (Jones et al., 2003b;Basso et al., 2016;Hoogenboom et al., 2019a), EPIC (Wang et al., 2012), AquaCrop (Kheir et al., 2021b) and STICS (Brisson et al., 2003) that have been developed for simulating wheat growth and development and predicting yield for various regions
Calibration and Validation of AQUACROP and APSIM Models to Optimize Wheat Yield and Water Saving in Arid Regions
https://www.researchgate.net/publication/356991062_Calibration_and_Validation_of_AQUACROP_and_APSIM_Models_to_Optimize_Wheat_Yield_and_Water_Saving_in_Arid_Regions
https://www.dpird.wa.gov.au/research/research-areas/grains-research/soil-science-and-crop-nutrition/?accordion=accordioncdaa5715dee24265879b172471a97890
https://www.agronomyaustraliaproceedings.org/images/sampledata/2024/2024ASAverburg_kirsten_2-164-560-Verburg-Kirsten.pdf
Review of APSIM’s soil nitrogen modelling capability: Lessons and implications
Verburg, et al.
Review of APSIM's soil nitrogen modelling capability for agricultural systems analyses. Agricultural Systems, 224, Article 104213
https://pure.au.dk/portal/en/publications/review-of-apsims-soil-nitrogen-modelling-capability-for-agricultu/
https://doi.org/10.1016/j.agsy.2024.104213
https://www.soilquality.org.au/factsheets/mineral-nitrogen
https://www.soilquality.org.au/factsheets/soil-nitrogen-supply
"the amount of mineral nitrogen in soil six weeks after sowing had no effect on grain yield (Murphy et al. 2009)"
SYN (Select Your Nitrogen) from the Department of Agriculture and Food, Western Australia,
Attachment 1 Users Manual for Select Your Nitrogen
Centre for eResearch and Digital Innovation
https://grdcfinalreports.cerdi.edu.au › view_attach...
SYN is a weekly time step, simulation model which is designed to give the user a quantitative feel for how different components of the farming system impact on
Attachment 1 Users Manual for Select Your Nitrogen
Centre for eResearch and Digital Innovation
https://grdcfinalreports.cerdi.edu.au
SYN is a weekly time step, simulation model which is designed to give the user a quantitative feel for how different components of the farming system impact on
Esperance (2007)
https://library.dpird.wa.gov.au/cgi/viewcontent.cgi?article=1080&context=bulletins
"While common practice is to apply all the fertiliser nitrogen at sowing or within a few weeks of sowing, nitrogen can be applied later if there is a good chance that rainfall after
application will wash the fertiliser into the active root zone. Delayed applications are required in leaching high rainfall environments,..."
"Yield Prophet®
Yield Prophet® is a web based daily time-step crop
growth simulation model based on the Agricultural
Production Simulation (APSIM) model. Subscribers ..."
and NuLogic from the commercial fertiliser company CSBP (Wesfarmers)
https://nulogic.csbp.com.au
(requires login)
CBH makes and sells N-fertilizers.
ecogrowth - seems to focus on trace elements, etc.
https://ecogrowth.com.au/crop-solutions/agronomic-support-testing/
retailers includ Nutrien Ag Solutions
https://www.nutrienagsolutions.com.au/digital-ag
"variable rate solutions"
https://grdc.com.au/resources-and-publications/all-publications/factsheets/2014/12/denitrification
https://www.mathsjournal.com/pdf/2021/vol6issue3/PartA/6-3-11-525.pdf
International Journal of Applied Mathematics and Statistics
Mathematical modeling of flow of fertilizer-water mixture through soil and its effect on concentration and plant growth
Rutto Kipkorir Timothy, Julius Shichikha Maremwa and Joseph Kipchirchir Kandie
(Kenya, 2021)
(pde, Richards equation, advection and diffusion ...)
https://pmc.ncbi.nlm.nih.gov/articles/PMC7053935/
Plant Signal Behav. 2020 Jan 27;15(2):1709718. doi: 10.1080/15592324.2019.1709718
Logistic Models for Simulating the Growth of Plants by Defining the Maximum Plant Size as the Limit of Information FlowTomonori Kawano a,✉, Nigel Wallbridge b, Carrol Plummer b
parameters may alter either or both of
carrying capacity K and/or rate r values
in Lotka’s Logistic equation
du/dt = r*(1- u/K)*u
Félicien Meunier et al.
Water movement through plant roots – exact solutions of the water flow equation in roots with linear or exponential piecewise hydraulic properties.
https://www.researchgate.net/publication/321974661_Water_movement_through_plant_roots_-_exact_solutions_of_the_water_flow_equation_in_roots_with_linear_or_exponential_piecewise_hydraulic_properties