Combining Seed Dressing and Foliar Applications of Phosphorus Fertilizer Can Give Similar Crop Growth and Yield Benefits to Soil Applications Together With Greater Recovery Rates

Peter J. Talboys, John R. Healey, Paul J. A. Withers, Tiina Roose, Anthony C. Edwards, Paulo S. Pavinato, Davey L. Jones*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Phosphorus (P) fertilizers have a dramatic effect on agricultural productivity, but conventional methods of application result in only limited recovery of the applied P. Given the increasing volatility in rock phosphate prices, more efficient strategies for P fertilizer use would be of economic and environmental benefit in the drive for sustainable intensification. This study used a combination of controlled-environment experiments and radioisotopic labeling to investigate the fertilizer use efficiency of a combination of seed (grain) dressing and foliar applications of P to spring wheat (Triticum aestivum L.). Radioisotopic labeling showed that the application of foliar P in the presence of photosynthetic light substantially increased both P-uptake into the leaf and P-mobilization within the plant, especially when an adjuvant was used. When compared with soil application of inorganic P buried into the rooting zone, a combination of a 3 μmol seed dressing and three successive 46.3 μmol plant−1 foliar applications were far more efficient at providing P fertilization benefits in P-limiting conditions. We conclude that a combination of seed dressing and foliar applications of P is potentially a better alternative to conventional soil-based application, offering greater efficiency in use of applied P both in terms of P-uptake rate and grain yield. Further work is required to evaluate whether these results can be obtained under a range of field conditions.
Original languageEnglish
Article number605655
JournalFrontiers in Agronomy
Volume2
Early online date4 Dec 2020
DOIs
Publication statusFirst published - 4 Dec 2020

Keywords

  • Agronomy
  • crop nutrition
  • foliar feeding
  • food security
  • integrated nutrient management
  • precision agriculture
  • fertilizer management
  • phosphorus use efficiency (PUE)

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