Use of a coupled soil-root-leaf model to optimise phosphate fertiliser use efficiency in barley

J Heppell, S Payvandi, P Talboys, KC Zygalakis, D Langton, R Sylvester-Bradley, AC Edwards, RL Walker, P Withers, DL Jones, T Roose

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Abstract

Aims Phosphorus (P) is an essential nutrient necessary for maintaining crop growth, however, it’s often used inefficiently within agroecosystems, driving industry to find new ways to deliver P to crops sustainably.We aim to combine traditional soil and crop measurements with climate-driven mathematical models, to give insight into optimising the timing and placement of fertiliser applications. Methods The whole plant crop model combines an above-ground leaf model with an existing spatially explicit below-ground root-soil model to estimate plant P uptake and above ground dry mass. We let P-dependent photosynthesis estimate carbon (C) mass, which in conjunction with temperature sets the root-growth-rate. Results The addition of the leaf model achieved a better estimate of two sets of barley field trial data for plant P uptake, compared with just the root-soil model alone. Furthermore, discrete fertiliser placement increases plant P uptake by up to 10 % in comparison to incorporating fertiliser. Conclusions By capturing essential plant processes we are able to accurately simulate P and C use and water and P movement during a cropping season. The powerful combination of mechanistic modelling and experimental data allows physiological processes to be quantified accurately and useful agricultural predictions for site specific locations to be made.
Original languageEnglish
Pages (from-to)341 - 357
Number of pages17
JournalPlant and Soil
Volume406
Issue number1
Early online date14 Apr 2016
DOIs
Publication statusFirst published - 14 Apr 2016

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Bibliographical note

1025062
1023377

Keywords

  • Above and below ground
  • Barley field study
  • Fertiliser strategy
  • Mathematical modelling
  • Phosphate
  • Phosphorus

Cite this

Heppell, J., Payvandi, S., Talboys, P., Zygalakis, KC., Langton, D., Sylvester-Bradley, R., Edwards, AC., Walker, RL., Withers, P., Jones, DL., & Roose, T. (2016). Use of a coupled soil-root-leaf model to optimise phosphate fertiliser use efficiency in barley. Plant and Soil, 406(1), 341 - 357. https://doi.org/10.1007/s11104-016-2883-4