Farmers in Hardin County Are Making a Difference
Soils that Are Prone to Flood
Karl and Alex Forsbach farm in Hardin County. They are our 31st Profiles of Soil Health Heroes. They farm below Pickwick Dam near Savannah, Tennessee. The lands are unique in that they may flood from time to time when the Tennessee Valley Authority must flood the terrace soils due to excess rain. Talking to farmers in the area, there are resistances to no-till and use cover crops due to the threat of seasonal floods that will move crop residue in large piles. Flood threats also can drown out cover crops or crops too for that matter. I first visited the Forsbachs and discussed their unique situation in April of 2015. I met Alex my first month as the Soil Specialist for Tennessee Association of Conservation Districts (TACD) at the Milan No-till Field Day, July of 2014. We discussed soil properties that factored into the rainfall simulator showing good infiltration and less erosion. We discussed cover crops and no-till. He invited Mark Roberts, NRCS District Conservationist, Savannah, Tennessee and me to their farm.. We finally were able to meet with him and his father, Karl in April of 2015. They had been using some vertical tillage to anchor the residue hoping to slow the movement of residue when flooding occurs. I discussed the effects of any tillage. Tillage destroys aggregates regardless of depth and leaves a restrictive zone or tillage pan that restricts infiltration. Live roots and soil biology aggregates the soil which leaves voids in the soil that leads to a granular or sub-angular blocky soil structure. This structure is like marbles in a glass. They fill up the space in the glass, but there are voids or space for air, water, and roots to freely move. That what roots and soil biology do for the soil. Tillage will destroy aggregates and consolidate the soil causing soil crusts and limited infiltration.