Skip to main content

Assessing the phosphorus status of winter wheat crops: inorganic orthophosphate in whole shoots

  • H. M. BOLLONS (a1) and P. B. BARRACLOUGH (a1)
    • Published online: 01 November 1999

Winter wheat (Triticum aestivum L., cv Mercia) was grown at Rothamsted over three seasons (1992/94/95) with plant-available soil P (Olsen-P) ranging from very deficient to superoptimal (1–52 mg P/kg; ADAS soil P Index 0–4). Critical Olsen-P for 95% maximum grain yield changed little between years and averaged 9 mg P/kg. Total-P and inorganic-P (Pi) were measured in whole shoots several times between late tillering and anthesis to see if Pi was a better indicator than total-P of the adequacy of P supply for maximum grain yield. Inorganic-P accumulated in shoot tissue water with increasing Olsen-P to a maximum concentration of c. 15 mM. Inorganic-P was a better indicator of crop P status as there was less variation in critical values between seasons and with crop growth stage. Expressing Pi concentrations on a tissue water basis (Piw) reduced the effect of differences in soil water supply and also offers the prospect of in situ testing. Over the three seasons, critical shoot Piw for 95% maximum grain yield averaged 4.7 mM (range 4·3–5·8 mM) during stem elongation.

Corresponding author
To whom all correspondence should be addressed. Email:
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

The Journal of Agricultural Science
  • ISSN: 0021-8596
  • EISSN: 1469-5146
  • URL: /core/journals/journal-of-agricultural-science
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
Type Description Title

 PDF (464 KB)
464 KB


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed