Use Efficiency Web Page
(most recent postings appear at the top)
Also see project to identify inefficient phosphorus plants (as indicators)
Therese McBeath, University of Adelaide
Shiping Deng, OSU
Mike McLaughlin, CSIRO
Daniel Edmonds, OSU
Brian Arnall, OSU
Bram Govaerts CIMMYT
Ivan Ortiz-Monasterio CIMMYT
Ken Sayre CIMMYT
Hailin Zhang OSU
Art Klatt OSU
Randy Taylor OSU
Wolfgang Pfeiffer, CIAT
Ricardo Melchiori, INTA"
Agustin Bianchini, AAPRESID
John Solie, OSU
Bill Raun, OSU
Kefyalew Girma, OSU
Jagadeesh Mosali, Noble Foundation
Marv Stone, OSU
Kent Martin, KSU
Steve Phillips, IPNI
OSU Graduate Students
Link on Phytic Acid (
OSU Research Publications on Foliar P, P Spectral Indices
Determination of Optimum Rate and Growth Stage for Foliar Applied Phosphorus in Corn. Commun. Soil Sci. Plant Anal.
Effect of Foliar Application of Phosphorus on Winter Wheat Grain Yield, Phosphorus Uptake and Use Efficiency J. Plant Nutr. 29: 2147 - 2163 (pdf)
Detection of Nitrogen and Phosphorus Nutrient Status in Winter Wheat Using Spectral Radiance. J. Plant Nutr. 21:1207-1233.
Detection of Nitrogen and Phosphorus Nutrient Status in Bermudagrass Using Spectral Radiance. J. Plant Nutr. 21:1189-1206.
The reference of Shiping to the importance of phytate is very interesting.
There is a research group working here on identifying organic P compounds who believe that there has been alot of inaccurate speciation of phytate (Smernik et al.,SSSAJ, 71, pp1045-1050). I can see this discussion is going to get very interesting with such a range of specialists!
In respect to the work I would be able to get funding for in Australia, I expect that the focus would be wheat. There has been some breeding work done in Australia to increase the P use efficiency of crops by solubilising organic P but I think this work has found limited success in field testing.
Dr Therese McBeath
Discipline of Soil and Land Systems
DX650-DP614, Waite Campus,
University of Adelaide
Glen Osmond, SA, 5064
Ph : +61 8 8303 8107
Fax : +61 8 8303 6717
CRICOS Provider Number 00123M
From: Deng, Shiping [mailto:firstname.lastname@example.org]
Sent: Friday, 11 July 2008 1:47 AM
To: Raun, Bill; email@example.com
Cc: Desta, Birehane Kasaye; firstname.lastname@example.org; email@example.com; Ortiz-Monasterio, Ivan (CIMMYT); Klatt, Art
Subject: RE: Foliar P funding application
Thanks for the information and for the invitation to join the team. It would be most useful if you already have P-use efficient and non-efficient plants identified. Otherwise we can go fishing for a needle in the ocean and hope to be lucky.
The website has some interesting information exchange. With respect to global P cycling, it was estimated that about 70% of fertilizer P applied every year is converted to phytate (a P storage compound in plants). I have a reference for this, but I think that it is more likely 70% of P taken up by plants (considering the low P use efficiency for plant uptake). In any case, phytate is an important compound in the global P cycling. If resource available, it would be helpful to identify plants that have the ability to take up phytate directly (to my knowledge, there are evidence, but not confirmed). Phytate is a small and water-soluble compound. Theoretically it is possible that this compound can get inside plants without breaking down to pieces.
Should we focus on wheat or include corn and other plants as well? I suspect what we are going to try could be plant specific.
There is also a lot of information from Australian studies on the relative availability of phytate versus other sources of organic P to plants by only via root uptake - works ok in solution culture or low P retention soils, but not in sorbing soils as phytate is very strongly held in soil.
Nothing done in the foliar uptake area with phytate as far as I know as yet.
Could be interesting.
Adams MA, Pate JS (1992) Availability of organic and
inorganic forms of phosphorus in lupins (Lupinus spp.). Plant and Soil 145,
Armstrong RD, Helyar KR
Utilisation of labelled mineral and organic phosphorus sources by
Martin JK, Cartwright B (1971) The comparitive plant
availability of 32P myo-inositol hexaphosphate and KH2PO4 added to soils.
Communications in Soil Science and Plant Analysis. 2, 375-381.
Anderson G, Williams EG, Moir JO (1974) A comparison of the sorption of inorganic orthophosphate and inositol hexaphosphate by six acidic soils. Soil Science 25, 51-62.
This is going to be fun! Kefyalew Desta (one of our recent PhD graduates and who is now an OSU Assistant Professor) has some ideas that he will be sharing with the entire group soon. Also, a while back we started a collaborative "non funded" project with several people identifying "P indicator plants", in this case wheat (see link below, and several articles on the site).
Ivan Ortiz-Monasterio (CIMMYT agronomist) has already started work with Art Klatt (wheat breeder) to identify "non-p-use efficient" plants that we could plant "randomly", then recognize them and treat those areas based on sensed data. We already have some wavelengths that Birhane Desta has looked at that we think will work for recognizing P deficiencies, similar to what we have done with the entire GreenSeeker project on N.
We haven't tested the new indices but what I've seen thus far looks ok.
With time, I'll try to start a page (similar to the one we started above) where we can share thoughts on foliar P. Lastly, Shiping Deng (Soil Microbiologist and Professor at OSU) has some pretty unique ideas on what she thinks we should be doing with foliar P applications. With time, we just have to develop a better P fertilization strategy, especially with P prices going through the roof, and P mines that aren't "growing." Ha.