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TZ-OH6 · April 3, 2011

I copied that article but it's on my broken computer. I remember it because I looked it up twice. IIRC, myco-free plants did well in high phos soil, while the myco inoculated plants did better in low phos soil.

This might be the article.

http://www.mendeley.com/research/myc...ze-phosphorus/

This is an interesting quote form another study.

"At high plant phosphorus (P) status, the mycorrhizal Pi uptake pathway was almost completely repressed and the mycorrhiza-inducible Pi transporter genes were down-regulated"

http://www.ncbi.nlm.nih.gov/pubmed/19140941

also

"It seems also that under medium soil P levels, as that of the 335 experimental condition, P fertilization has a very limited effect on tomato growth and yield. Instead the presence of the mycorrhizal infection improves P availability, but, in order to avoid negative effect on mycorrhizal effectiveness, P fertilization should not exceed the rate of 60 kg·ha-1 P2O5."

from here
http://www.reforest.com/desk/questio...ion+and+Tomato

I just I found this which seems to say the opposite, but looking at the results, the nonmyco plants grown with high soil phosphorus had better results than myco plants grown under low soil phos. They didn't do myco plants with high soil phos.

http://afrsweb.usda.gov/SP2UserFiles...logist2002.pdf

The point of using myco inoculant on tomatoes may be mute if organic fields experience phosphous buildup due to repeated inputs of manures etc to provide nitrogen.

April 3, 2011	#3
TZ-OH6 Tomatovillian™ Join Date: Feb 2008 Location: Mid-Ohio Posts: 847	I copied that article but it's on my broken computer. I remember it because I looked it up twice. IIRC, myco-free plants did well in high phos soil, while the myco inoculated plants did better in low phos soil. This might be the article. http://www.mendeley.com/research/myc...ze-phosphorus/ This is an interesting quote form another study. "At high plant phosphorus (P) status, the mycorrhizal Pi uptake pathway was almost completely repressed and the mycorrhiza-inducible Pi transporter genes were down-regulated" http://www.ncbi.nlm.nih.gov/pubmed/19140941 also "It seems also that under medium soil P levels, as that of the 335 experimental condition, P fertilization has a very limited effect on tomato growth and yield. Instead the presence of the mycorrhizal infection improves P availability, but, in order to avoid negative effect on mycorrhizal effectiveness, P fertilization should not exceed the rate of 60 kg·ha-1 P2O5." from here http://www.reforest.com/desk/questio...ion+and+Tomato I just I found this which seems to say the opposite, but looking at the results, the nonmyco plants grown with high soil phosphorus had better results than myco plants grown under low soil phos. They didn't do myco plants with high soil phos. http://afrsweb.usda.gov/SP2UserFiles...logist2002.pdf The point of using myco inoculant on tomatoes may be mute if organic fields experience phosphous buildup due to repeated inputs of manures etc to provide nitrogen.