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| Not so sure high P (100+ppm) when associated with high Ca high OM clay suppresses MF....they were in association with sweet potato in the garden this fall at digging....just an observation...should have made it a Kodak moment...very distinct hyphal network present in soil conditions some say won't work! Resilient OM IMO is key to fungi presence, very similar to rumen fungi, where fracture of lignocellulolistic bonds of resilient fiber is the 'forte of that microbial type'. Shift the diet fed to the cow then shift the rumen microbial community....shift the diet fed to the soil then shift the soil microbial community....I see them somewhat related and one in the same, O2 presence being the difference tween cow and soil, but both need a balanced diet.
Brassica are said to excrete strong root exudates capable of increasing plant available P from fairly insoluble P salts in the soil around the brassica root zone....the taproot of brassica can also bring up P from subsoils which would otherwise be unavailable to crop roots. Ray Weil's reserched showed a 10% or so increase in soil P test after 3 yr of successive radish....this may also explain some of the yield boost seen when radish is co-cropped with wheat for example, a crop with history of soil P sensitivity/availability/fertility etc. Some other papers have shown that MF return to soil plant association with a host crop within 6 months after termination of a solid brassica crop.
Anyway, I like to think of brassica roots as being able to create a 'vat of soluble phosphate to bath in' whereas plants which associate with MF direct use the ultra fine filaments of MF as 'adopted root hairs' to probe soil crevaces where said crop true roots would not be able to dine. Hope that makes sense, Bill?
One question I hope to see answered in the next few years is the diet we need to feed the soil to alter the microbial community in a favorable way to get past certain crop/soil issues. Rick Haney's soil test is 'on the edge of wetness' there....others may follow suit. | |
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Some thoughts on fungi and nutrients
