Hello Jared, There are quite a few studies done with arbuscular mycorrhizas in the field. To add to Joel's list, I would also include: 1. Kabir, Z. and Koide, R. T, 2002, Effect of autumn and winter mycorrhizal cover crops on soil properties, nutrient uptake and yield of sweet corn in Pennsylvania, USA, Plant and Soil, 238(2):205-215. 2. Boswell, E. P., Koide, R. T., Shumway, D. L.,Addy, H. D., 1998, Winter wheat cover cropping, VA mycorrhizal fungi and maize growth and yield, Agriculture, Ecosystems, and Environment, 67(1):55-65. 3.Cheng, X. M., Baumgartner, K., 2004, Arbuscular mycorrhizal fungi-mediated nitrogen transfer from vineyard cover crops to grapevines, Biology and Fertility of Soils, 40(6): 406:412. As Joel mentioned, you can search for all the mycorrhiza literature on the Mycorrhiza Information Exchange database at http://mycorrhiza.ag.utk.edu/ <http://mycorrhiza.ag.utk.edu/> . Sincerely, michelle schroeder Michelle S. Schroeder, Ph.D. Assistant Professor, Agroecology Crop Science Department North Carolina State University 2406 Williams Hall Campus Box 7620 Raleigh, NC 27695-7620 USA Phone: (919) 513-0085 FAX: (919) 515-7959 Email: michelle_schroeder@ncsu.edu Personal webpage: http://www.cropsci.ncsu.edu/personnel/Schroeder_Michelle/Default.asp?fmtinfo=1,450,150 <http://www.cropsci.ncsu.edu/personnel/Schroeder_Michelle/Default.asp?fmtinfo=1,450,150> Agroecology program: http://www.cropsci.ncsu.edu/agroecology/ <http://www.cropsci.ncsu.edu/agroecology/> ________________________________ From: Sustainable Agriculture Network Discussion Group on behalf of Jarrod Gunn-Mcquillan Sent: Fri 3/17/2006 11:29 AM To: SANET-MG@LISTS.IFAS.UFL.EDU Subject: Re: [SANET-MG] Entrez PubMed Soil Quality & phosphate availability Does anyone know of any field studies using Mycorrhizae?? There seems to be lots of greenhouse, microcosm etc. etc. Thanks -----Original Message----- From: Sustainable Agriculture Network Discussion Group [mailto:SANET-MG@LISTS.IFAS.UFL.EDU]On Behalf Of Dale Wilson Sent: Friday, March 17, 2006 10:00 AM To: SANET-MG@LISTS.IFAS.UFL.EDU Subject: Re: [SANET-MG] Entrez PubMed Soil Quality & phosphate availability Hi Edna, >> I'm afraid I'm over my head on this subject. I'm interested, >> but I understood maybe about half of what I read and my >> unabridged dictionary didn't help me a whole lot.... >> Can anyone tell me if that is the take home message in this >> research? Unlike nitrogen and potassium, phosphorus in the soil is tightly bound to the mineral fraction. As water moves from the soil into the roots, potassium and nitrogen and most other minerals are swept along into the plant along with the water (yeah, I know, this is an oversimplification), but not so with phosphorus. The roots have to go GET phosphorus by intimate contact with soil particles. Most plants simply cannot produce enough root surface area to get the phosphorus they need, even when there is plenty around. Almost all crops form a symbiotic relationship with a class of fungus called "arbuscular mycorrhizae fungi" (AMF). The AMF live in the soil and have an extensive network of fine mycelia. As a young plant is established, the root system becomes infected by the AMF which transports phosphorus into the roots. http://en.wikipedia.org/wiki/Arbuscular_mycorrhiza "Mycorrhizae helper bacteria" work with the AMF to help dissolve P from the surfaces of soil particles. The abstract cited by Lawrence studied an association between the AMF and the "growth-promoting rhizobacteria" Bacillus subtilis and Entrobacter. Here is the full text of the paper: http://aem.asm.org/cgi/reprint/63/11/4408 Lawrence wrote: > I interpret this to mean that the researchers discovered that the > presence of a specific AM fungus innoculated with two phosphate- > solubilizing ("helper") bacteria in soils with low phosphate > bioavailability resulted in higher levels of plant available > phosphorus and "significantly increased biomass and N and P > accumulation in plant tissues". I don't think this is a new finding. The main point of the paper seems to be the use the isotopic dilution method as a tool. There is a lot of literature about this subject. > So, is anyone marketing a soil innoculant for organic and > sustainable farmers who periodically apply rock phosphate to > farmland with normally low P bioavailability (I assume this can > be detected in a soil test)? I wouldn't jump to the conclusion that inoculation with these organisms in normal field situations will be beneficial. I would try it out carefully in designed experiments and distrust promotional literature. AMF is normally present in most fields, and the bacteria mentioned are rugged and extremely common in soil. The paper does show why rock phosphate (RP) might be more available to plants than one would think from the soil chemistry per se. I still would make sure my RP is high-grade and finely ground. Dale __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ******************************************************** To unsubscribe from SANET-MG: 1- Visit http://lists.sare.org/archives/sanet-mg.html to unsubscribe or; 2- Send a message to <listserv@sare.org> from the address subscribed to the list. Type "unsubscribe sanet-mg" in the body of the message. Visit the SANET-MG archives at: http://lists.sare.org/archives/sanet-mg.html. Questions? Visit http://www.sare.org/about/sanetFAQ.htm. 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