Significance of root hairs at the field scale - modelling root water and phosphorus uptake under different field conditions

S. Ruiz (Lead / Corresponding author), N. Koebernick, S. Duncan, D. McKay Fletcher, C. Scotson, A. Boghi, M. Marin, A. G. Bengough, T. S. George, L. K. Brown, P. D. Hallett, T. Roose

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Abstract

Background and aims: Root hairs play a significant role in phosphorus (P) extraction at the pore scale. However, their importance at the field scale remains poorly understood.

Methods: This study uses a continuum model to explore the impact of root hairs on the large-scale uptake of P, comparing root hair influence under different agricultural scenarios. High vs low and constant vs decaying P concentrations down the soil profile are considered, along with early vs late precipitation scenarios.

Results: Simulation results suggest root hairs accounted for 50% of total P uptake by plants. Furthermore, a delayed initiation time of precipitation potentially limits the P uptake rate by over 50% depending on the growth period. Despite the large differences in the uptake rate, changes in the soil P concentration in the domain due to root solute uptake remains marginal when considering a single growth season. However, over the duration of 6 years, simulation results showed that noticeable differences arise over time.

Conclusion: Root hairs are critical to P capture, with uptake efficiency potentially enhanced by coordinating irrigation with P application during earlier growth stages of crops.

Original languageEnglish
Pages (from-to)281-304
Number of pages24
JournalPlant and Soil
Volume447
Issue number1
Early online date6 Dec 2019
DOIs
Publication statusPublished - Feb 2020

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Keywords

  • Mathematical modelling
  • Plant roots
  • Rhizosphere
  • Soil
  • Water
  • Phosphorus
  • Root hairs
  • Field

Cite this

Ruiz, S., Koebernick, N., Duncan, S., McKay Fletcher, D., Scotson, C., Boghi, A., Marin, M., Bengough, A. G., George, T. S., Brown, L. K., Hallett, P. D., & Roose, T. (2020). Significance of root hairs at the field scale - modelling root water and phosphorus uptake under different field conditions. Plant and Soil, 447(1), 281-304. https://doi.org/10.1007/s11104-019-04308-2