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Roseville Soils Testing Annual Report: Year 1 <br />December 29, 2022 <br />Page 4 <br />Soil pH <br />Minnesota Lab <br />Site <br />Site Description <br />vegetation <br />management <br />10/15/2021 <br />6/13/2022 <br />10/10/2022 <br />1 <br />swale <br />native <br />8.0 <br />8.0 <br />8.0 <br />2 <br />swale edge <br />turf <br />8.5 <br />8.0 <br />7.9 <br />3 <br />1 top of berm - compost <br />native <br />8.0 <br />8.0 <br />7.9 <br />4 <br />top of berm - CONTROL <br />native <br />8.0 <br />8.0 <br />8.0 <br />5 <br />toe of slope - compost <br />turf <br />7.9 <br />8.0 <br />7.8 <br />6 <br />toe of slope - CONTROL <br />turf <br />7.9 <br />7.9 <br />7.9 <br />Soil pH is considered optimal for most plants at 6.0-6.5 <br />Overall, fertility seems higher in composted areas. It also seems higher in at the toe of the slope compared to the summit. <br />Natural fertility in these fill soils seemed high to begin with as well. However, C:N ratio is not optimal in both composted <br />and control areas, suggesting that compost and erosion control blanket were too much feed stock for the microbes. Too <br />much feed stock creates a situation where microbes consume nitrogen, leaving less for plants. Soil pH is also a bit high <br />across all study areas. <br />Salts: <br />Salt <br />Nebraska Lab (mmho/cm) <br />Site <br />Site Description <br />vegetation <br />management <br />10/15/2021 <br />6/13/2022 <br />10/10/2022 <br />1 <br />swale <br />native <br />2 <br />swale edge <br />turf <br />3 <br />top of berm - compost <br />native <br />0.44 <br />0.09 <br />4 <br />top of berm - CONTROL <br />native <br />0.17 <br />0.09 <br />5 <br />toe of slope - compost <br />turf <br />0.61 <br />0.14 <br />6 <br />Ftoe of slope - CONTROL <br />turf <br />0.55 <br />0.19 <br />Salt can hinder plant growth at levels greater than 3.0 mmho/cm. <br />A look at salts was added this year because food waste compost can sometimes include higher salt content. Fortunately, <br />Ward Labs has been providing that test in the past. Salts do not seem to be present in high enough concentrations to affect <br />soil and plant health. <br />Page 36 of 69 <br />