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Volume 81 Issue 2, March-April 2017



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  • SOIL PHYSICS & HYDROLOGY up

    • Y. Saulick, S.D.N. Lourenço and B.A. Baudet
      A Semi-Automated Technique for Repeatable and Reproducible Contact Angle Measurements in Granular Materials using the Sessile Drop Method
      Core Ideas
      • Large standard deviations in contact angle measurements are frequently encountered.
      • Image exposure and baseline position considerably affect contact angle measurements.
      • Techniques to fit contact angles differ significantly from each other at high contact angles.
      • A new technique has been developed to enhance contact angle measurements.
      • Improvements in standard deviations by 30 to 40% have been found in hydrophobic materials.
      doi:10.2136/sssaj2016.04.0131
      Soil Science Society of America Journal 2017 81:241-249
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    • Chong Chen, Kelin HuTusheng Ren, Yin Liang and Emmanuel Arthur
      A Simple Method for Determining the Critical Point of the Soil Water Retention Curve
      Core Ideas
      • A fixed tangent line method was developed to estimate the critical point of the soil water retention curve as an alternative to the commonly used flexible tangent line method.
      • The critical points of the soil water retention curve from the proposed method and the flexible tangent line method were compared.
      • Particle-size distribution and specific surface area had significant effects on the critical point of the soil water retention curve.
      doi:10.2136/sssaj2016.06.0187
      Soil Science Society of America Journal 2017 81:250-258
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    • Tongchuan Li, Ming’an Shao and Yuhua Jia
      Characteristics of Soil Evaporation and Temperature under Aggregate Mulches Created by Burrowing Ants ( Camponotus japonicus )
      Core Ideas
      • We studied a new material of mulch made by soil-dwelling ants.
      • Ants burrowed aggregates significantly affected soil evaporation and temperature.
      • Hydrolyzed aggregates could not restrain soil evaporation after rain.
      doi:10.2136/sssaj2016.08.0259
      Soil Science Society of America Journal 2017 81:259-267
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  • SOIL CHEMISTRY up

    • Xinmin Liu, Wuquan Ding, Rui Tian, Wei Du and Hang Li
      Position of Shear Plane at the Clay–Water Interface: Strong Polarization Effects of Counterions
      Core Ideas
      • A nonlinear Poisson–Boltzmann equation including ionic polarization effects was developed.
      • A new approach was developed to estimate the shear plane position at solid–liquid interface.
      • The strong polarization is an important factor in the change of shear plane position.
      doi:10.2136/sssaj2016.08.0261
      Soil Science Society of America Journal 2017 81:268-276
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  • SOIL BIOLOGY & BIOCHEMISTRY up

    • Francisco J. Calderón, Steve Culman, Johan Six, Alan J. Franzluebbers, Meagan Schipanski, Joshua Beniston, Stuart Grandy and Angela Y. Y. Kong
      Quantification of Soil Permanganate Oxidizable C (POXC) Using Infrared Spectroscopy
      Core Ideas
      • Infrared spectroscopy and chemometrics can be used to quantify soil labile C.
      • Soils amended with organic materials need to be taken into account during calibration development.
      • Selection of spectral regions can give parsimonious predictions of soil total and labile C.
      doi:10.2136/sssaj2016.07.0216
      Soil Science Society of America Journal 2017 81:277-288
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    • Jen Owens, Tim J. Clough, Johannes Laubach, John E. Hunt and Rodney T. Venterea
      Nitrous Oxide Fluxes and Soil Oxygen Dynamics of Soil Treated with Cow Urine
      Core Ideas
      • Heavy irrigation, surface flooding, and urine decrease soil oxygen.
      • When soil oxygen decreases, N2O fluxes rapidly increase when nitrogen is available.
      • Nitrous oxide fluxes are explained well using relative soil gas diffusivity.
      doi:10.2136/sssaj2016.09.0277
      Soil Science Society of America Journal 2017 81:289-298
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      [ Supplement 1 ]
      unlockOPEN ACCESS
  • SOIL FERTILITY & PLANT NUTRITION up

    • Nina Siebers, Matthias Sumann, Klaus Kaiser and Wulf Amelung
      Climatic Effects on Phosphorus Fractions of Native and Cultivated North American Grassland Soils
      Core Ideas
      • Influence of climate on phosphorus dynamics in soil.
      • Regression analyses for climosequence in Great Plains.
      • Influence of cultivation and size fractions on phosphorus dynamics.
      doi:10.2136/sssaj2016.06.0181
      Soil Science Society of America Journal 2017 81:299-309
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    • Sarah M. Collier, Matthew D. Ruark, Mack R. Naber, Todd W. Andraski and Michael D. Casler
      Apparent Stability and Subtle Change in Surface and Subsurface Soil Carbon and Nitrogen under a Long-Term Fertilizer Gradient
      Core Ideas
      • Long-term fertilizer rate affected soil properties to 1 m under continuous corn.
      • Inorganic N fertilization was a benefit rather than a detriment to soil C and N.
      • The most productive treatments maintained but did not build soil C and N.
      • All fertilizer rate treatments had less topsoil than the field edge.
      doi:10.2136/sssaj2016.09.0299
      Soil Science Society of America Journal 2017 81:310-321
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      [ Supplement 1 ]
      unlockOPEN ACCESS
    • Richard Engel, Clain Jones, Carlos Romero and Rosie Wallander
      Late-Fall, Winter and Spring Broadcast Applications of Urea to No-Till Winter Wheat I. Ammonia Loss and Mitigation by NBPT
      Core Ideas
      • Urea volatility was greater following late-fall and winter applications to cold soils compared with spring applications to warmer soils.
      • NBPT reduced cumulative NH3 loss from urea by 66%.
      • Urea applications in the late-fall and winter resulted in prolonged periods of NH3 flux.
      doi:10.2136/sssaj2016.10.0332
      Soil Science Society of America Journal 2017 81:322-330
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    • Carlos M. Romero, Richard E. Engel, Chengci Chen, Roseann Wallander and Clain A. Jones
      Late-Fall, Winter, and Spring Broadcast Applications of Urea to No-Till Winter Wheat II. Fertilizer N recovery, Yield, and Protein as Affected by NBPT
      Core Ideas
      • Fertilizer 15N recovery of urea (with and without NBPT) was directly related to cumulative NH3 loss.
      • Spring applied urea provided better recovery than late-fall and winter applications.
      • NBPT improved fertilizer 15N recovery, particularly for late-fall and winter applications that were most susceptible to volatility.
      doi:10.2136/sssaj2016.10.0333
      Soil Science Society of America Journal 2017 81:331-340
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  • PEDOLOGY up

    • Canying Zeng, Lin Yang and A-Xing Zhu
      Construction of Membership Functions for Soil Mapping using the Partial Dependence of Soil on Environmental Covariates Calculated by Random Forest
      Core Ideas
      • This study develops a method to construct membership functions representing knowledge on soil–environment relationships from partial dependence.
      • Use of representative samples as training samples is recommended when applying the proposed method.
      • Training samples (including representative samples and other samples) with good coverage in the environmental feature space would allow Random Forest to obtain more accurate soil maps than using representative samples.
      • Partial dependence plots generated by Random Forest imply an association between soil and environmental variables.
      doi:10.2136/sssaj2016.06.0195
      Soil Science Society of America Journal 2017 81:341-353
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    • Matthew R. Levi
      Neighborhood Size of Training Data Influences Soil Map Disaggregation
      Core Ideas
      • Focal summaries of covariate data around sampling points affect model performance.
      • Support vector machine and random forest approaches produced the best results.
      • A 150-m neighborhood emerged as the best model, albeit with a general soil map.
      • Multiscale covariate data reflect realistic patterns of soil–landscape features.
      doi:10.2136/sssaj2016.08.0258
      Soil Science Society of America Journal 2017 81:354-368
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      [ Supplement 1 ]
    • Carrie-Ann Haydu-Houdeshell, Robert C. Graham, Adam C. Peterson, Paul F. Hendrix and Sylvie A. Quideau
      Morphology and Genesis of Humus Profiles under Chaparral Shrubs in Southern California
      Core Ideas
      • Litter layers of chaparral soils differ dramatically under different plant species.
      • The rate of litterfall, balanced by the rate of decomposition, influences the type of litter layers that develop.
      • Macrofauna, such as earthworms, are inhibited by dry conditions and have minimal effects on litter layer characteristics.
      doi:10.2136/sssaj2016.09.0290
      Soil Science Society of America Journal 2017 81:369-379
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  • SOIL & WATER MANAGEMENT & CONSERVATION up

    • Lotfollah Abdollahi, Gizachew Tarekegn Getahun and Lars Juhl Munkholm
      Eleven Years’ Effect of Conservation Practices for Temperate Sandy Loams: I. Soil Physical Properties and Topsoil Carbon Content
      Core Ideas
      • Moldboard plowing decreased VESS score and soil penetration resistance.
      • Reduced tillage combined with residue retention enhanced soil structural stability.
      • Residue retention alleviated unfavorable soil structure effects of reduced tillage.
      • Clay and SOC were confirmed as key factors affecting soil structure.
      • Combining minimal soil disturbance and residue retention improved soil structure.
      doi:10.2136/sssaj2016.06.0161
      Soil Science Society of America Journal 2017 81:380-391
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    • Lotfollah Abdollahi and Lars Juhl Munkholm
      Eleven Years’ Effect of Conservation Practices for Temperate Sandy Loams: II. Soil Pore Characteristics
      Core Ideas
      • Long-term effects of tillage, rotation, and residue management studied.
      • Residue retention increased porosity, air permeability, and gas diffusivity.
      • Residue retention alleviated negative effects of reduced tillage on soil pores.
      • Moldboard plowing caused best topsoil (0-20 cm depth) quality.
      • Direct drilling resulted in highest air permeability at the 18- to 27-cm depth.
      doi:10.2136/sssaj2016.07.0221
      Soil Science Society of America Journal 2017 81:392-403
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    • Richard E. Engel, Perry R. Miller, Brian G. McConkey and Roseann Wallander
      Soil Organic Carbon Changes to Increasing Cropping Intensity and No-Till in a Semiarid Climate
      Core Ideas
      • After 10-yr, NT annual cropping systems resulted in greater soil organic C mass relative to tilled fallow-wheat.
      • Cropping system intensity was more important to SOC mass than tillage.
      • Changes in SOC mass were directly related to NPP and total C inputs.
      • Annual cropping with NT management resulted in greater SOC mass (0–30 cm) than F-W systems.
      • SOC accretion was greatest in the CRP system.
      doi:10.2136/sssaj2016.06.0194
      Soil Science Society of America Journal 2017 81:404-413
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    • Manbir K. Rakkar, Humberto Blanco-Canqui, Rhae A. Drijber, Mary E. Drewnoski, James C. MacDonald and Terry Klopfenstein
      Impacts of Cattle Grazing of Corn Residues on Soil Properties after 16 Years
      doi:10.2136/sssaj2016.07.0227
      Soil Science Society of America Journal 2017 81:414-424
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  • BOOK REVIEW up

    • Bruce L. Vasilas
      Wetland Soils: Genesis, Hydrology, Landscapes, and Classification, Second Edition
      doi:10.2136/sssaj2017.0001br
      Soil Science Society of America Journal 2017 81:425-425
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    • Jim J. Wang
      Trace Elements in Waterlogged Soils and Sediments
      doi:10.2136/sssaj2017.0002br
      Soil Science Society of America Journal 2017 81:426-426
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