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Browsing by Author Ochsner, T.E.

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  • Estimating Deep Drainage Using Deep Soil Moisture Data under Young Irrigated Cropland in a Desert‐Oasis Ecotone, Northwest China

    • Authors: Zhang, Y.;  Advisor: -;  Participants: Zhao, W.; Ochsner, T.E.; Wyatt, B.M.; Liu, H.; Yang, Q. (2019)

  • The objective of this study was to estimate the deep drainage rate using the HYDRUS‐1D model based on soil moisture data in the deep vadose zone. Soil moisture at depths ranging from 0 to 200 cm was measured using HydraProbe II soil sensors in maize (Zea mays L.) and wheat (Triticum aestivum L.) fields in 2015 and 2017, respectively. Using a novel simulation approach based on soil moisture data in the deep vadose zone, the HYDRUS‐1D model provided reliable estimates of deep drainage as confirmed by comparison with estimates from the soil water balance method and prior studies in the region. The annual deep drainage averaged 468 mm, and the annual deep drainage coefficient averaged 43%...
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  • Soil Water Dynamics and Nitrate Leaching Under Corn–Soybean Rotation, Continuous Corn, and Kura Clover

    • Authors: Ochsner, T.E.;  Advisor: -;  Participants: Schumacher, T.W.; Venterea, R.T.; Feyereisen, G.W.; Baker, J.M. (2018)

  • This study examines differences in soil water dynamics and nitrate‐nitrogen (N) leaching among cropping systems and N fertilizer sources in a long‐term experiment in southeastern Minnesota. Drainage and leachate concentrations were measured for 4 yr using automated equilibrium tension lysimeters installed below the root zone in replicated, large plots on a well‐drained silt loam soil. Soil water storage was monitored using water content reflectometers. Corn–soybean and continuous corn cropping systems exhibited similar soil water dynamics, drainage rates (145–202 mm yr−1), leachate nitrate N concentrations (21.3–25.6 mg L−1), and nitrate N leaching loads (30–75 kg ha−1 yr−1). Nitrate‐...