How does flooding effect soil quality? Reducing Pore Space: Loss of pore space can result in decreased infiltration rate, ultimately exacerbating runoff.

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Presentation transcript:

How does flooding effect soil quality? Reducing Pore Space: Loss of pore space can result in decreased infiltration rate, ultimately exacerbating runoff potential. Lowering Soil Fertility: Anaerobic respiration can cause alterations in elemental availability. Decreasing Mycorrhizal Colonization: Mycorrhizae facilitates increased plant uptake of nutrients. What is Post Flood Syndrome? Post flood syndrome is the result of mycorrhizae loss in the soil. Mycorrhizae help increase the soil volume a plant has access to, aiding the plant in the uptake of nutrients. A study by Viebrock (1988) showed that plant roots with mycorrhizal colonization had access to phosphorus as much as 20-40X further than roots without mycorrhizal colonization. Mycorrhizae is a symbiotic fungus that inhabits cortical root cells. Without a host plant, mycorrhizae cannot live. Case Study #1: Does Soil Fertility with Small-Scale Elevation Differences? On four dates, soils were collected in and 18” field depression with an average difference of 2” in elevation. Over the course of one year, we found:  Higher correlations of elements and elevation during spring when soil has been minimally disturbed.  After the wettest two consecutive months recorded in Vermont, there was no correlation on such a small scale. Individual treatments did not have a significant effect on soil fertility. However, when considering success of cover crop, outcomes differed between plots with established and unestablished cover crops. Preliminary results indicate that elevation in field position significantly affected fertility and corn growth, suggesting that cover crops need to be managed with respect to field position. Case Study #2: Do Cover Crops Effect Soil Fertility? ConclusionAcknowledgements Six treatments were planted in October Soil samples from May 2013 were analyzed. Here’s what we found:  Effect on Ca, Fe, Mn, P, and S can be grouped as positive or negative by success of cover crop.  Treatments did not fall is such groupings for K, Mg, and Al. Special thanks to: Alan Howard Alison Brody Jonathon Gonzalez Purdue University Agronomy Department for right topmost picture of corn: Flooding, Soil Quality, and Cover Crops: Two Case Studies Two Case Studies Lindsey Ruhl*, Josef Görres *contact: Website: Case Study #2: Does Elevation in Field Location Affect Soil Fertility? Correlation of Elements with Elevation by Sampling Date *based on.05>p-value May 3, 2012Oct. 18, 2012April 9, 2013June 21, 2013 AlYES (-)NO CaNO FeYES (-)NO KYES (-)NOYES (+)NO MgNO MnYES (-)NO PYES (-)NOYES (+)NO Picture Date: May 7 th,2012 Picture Date: Oct. 9,,2012 Picture Date: May 27 th,,2013 Al Mg` K Ca Mn S P Fe Mycorrhizae Colonization in Root Wall Significant Correlations Between Al, Ca, Fe, S with Field Position In May 2013, soil samples were taken from over wintered cover crop stands. We found:  Fe, Mg, Mn, and moisture significantly correlated with elevation in field position. In late summer 2013, corn biomass and height were measured. Data shows:  Elevation in field position has a statistically significant impact on corn growth.  Lower elevations in field positions have lower plant growth than higher positions. K Mg Al Effect of Establishment Success: Ca, Mn, S Effect of Establishment Success: P and Fe Effect of Establishment Success: K, Mg, Al Picture Date: March 29 th, 2013