Author: Meyer Bohn

Evaluating the Accuracy of Ensemble Machine Learning and Statistical Uncertainty: Spatial Prediction of Topsoil Thickness in Iowa

Posted on | Meyer Bohn

Meyer Bohn and Bradley Miller – Iowa Water Center Conference April 6-8, 2021 Abstract The objectives of this study were to assess spatial predictions of topsoil thickness from models produced from ensemble machine learning algorithms along with assessing the uncertainty estimations associated with those models. Boosting is one example of an ensemble method, which attempts …Continue reading “Evaluating the Accuracy of Ensemble Machine Learning and Statistical Uncertainty: Spatial Prediction of Topsoil Thickness in Iowa”

Iowa Soil Drainage Class Maps [gSSURGO]

Posted on | Meyer Bohn

“Drainage class (natural)” refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the water regime by human activities, either through drainage or irrigation, are not a consideration unless they have significantly changed the morphology of the soil. Seven classes of natural soil drainage …Continue reading “Iowa Soil Drainage Class Maps [gSSURGO]”

Iowa Depth to Water Table Maps [gSSURGO]

Posted on | Meyer Bohn

“Water table” refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors (redoximorphic depletions) in the soil. A saturated zone that lasts for less than …Continue reading “Iowa Depth to Water Table Maps [gSSURGO]”

Iowa Soil pH Maps [gSSURGO]

Posted on | Meyer Bohn

Soil reaction is a measure of acidity or alkalinity. It is important in selecting crops and other plants, in evaluating soil amendments for fertility and stabilization, and in determining the risk of corrosion. In general, soils that are either highly alkaline or highly acid are likely to be very corrosive to steel. The most common …Continue reading “Iowa Soil pH Maps [gSSURGO]”

Iowa Soil Saturated Hydraulic Conductivity (Ksat) Maps [gSSURGO]

Posted on | Meyer Bohn

Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a saturated soil transmit water. The estimates are expressed in terms of micrometers per second. They are based on soil characteristics observed in the field, particularly structure, porosity, and texture. Saturated hydraulic conductivity is considered in the design of soil drainage systems and …Continue reading “Iowa Soil Saturated Hydraulic Conductivity (Ksat) Maps [gSSURGO]”

Iowa Soil Clay Content Maps [gSSURGO]

Posted on | Meyer Bohn

Clay as a soil separate consists of mineral soil particles that are less than 0.002 mm in diameter. The estimated clay content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 mm in diameter. The amount and kind of clay affect the fertility and …Continue reading “Iowa Soil Clay Content Maps [gSSURGO]”

Iowa Soil Silt Content Maps [gSSURGO]

Posted on | Meyer Bohn

Silt as a soil separate consists of mineral soil particles that are 0.002 to 0.05 mm in diameter. In the database, the estimated silt content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 mm in diameter. The content of sand, silt, and clay …Continue reading “Iowa Soil Silt Content Maps [gSSURGO]”

Iowa Soil Sand Content Maps [gSSURGO]

Posted on | Meyer Bohn

Sand as a soil separate consists of mineral soil particles that are 0.05 mm to 2 mm in diameter. In the database, the estimated sand content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 mm in diameter. The content of sand, silt, and …Continue reading “Iowa Soil Sand Content Maps [gSSURGO]”

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