Výsledky vyhledávání - "R. D. Hammer"

Autor: R. D. Hammer, A. L. Thompson, J. Yang, R. W. Blanchar

Publikováno v: Plant and Soil. 250:175-182

A soil-based productivity index (PI) has been developed and is being tested as a means of quantitatively assessing potential soil productivity and predicting crop yield. Validation of the PI requires the PI-yield calibration for various soil-crop-cli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe26966a4edd98812ef5b4a7c0a4e6ee
https://doi.org/10.1023/a:1022801322245

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Soil-Landform Relationships on a Loess-Mantled Upland Landscape in Missouri

Autor: F. J. Young, R. D. Hammer

Publikováno v: Soil Science Society of America Journal. 64:1443-1454

Soil survey users are requesting statistically valid distributions of soil attributes that are important for management and land use. The hypothesis that many soil attributes vary predictably with landscape positions was tested with 257 pedons from p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::08922f9515fa279681f72f531af8babb
https://doi.org/10.2136/sssaj2000.6441443x

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Defining Geographic Soil Bodies by Landscape Position, Soil Taxonomy, and Cluster Analysis

Autor: F. J. Young, R. D. Hammer

Publikováno v: Soil Science Society of America Journal. 64:989-998

The key Soil Taxonomy is based upon the idea that certain properties can be used to define populations of soils from the soil continuum. The soil mapping paradigm is that similar soil populations exist within landforms. High taxonomic variability has

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56e6805f0f886041d538aca40487a9ee
https://doi.org/10.2136/sssaj2000.643989x

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Frequency Distributions of Soil Properties on a Loess-mantled Missouri Watershed

Autor: F. J. Young, D. Larsen, R. D. Hammer

Publikováno v: Soil Science Society of America Journal. 63:178-185

Frequency distributions of soil property values are largely unknown, yet they are important to studies of soil variability. Our objectives in this paper were to (i) evaluate the distributional normality of soil properties within and among upland geom

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::744fb5c0ccbcfaeac45ec7cf94c0100c
https://doi.org/10.2136/sssaj1999.03615995006300010025x

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Soybean Growth and Rhizosphere pH as Influenced by A Horizon Thickness

Autor: A. L. Thompson, R. D. Hammer, J. Yang, R. W. Blanchar

Publikováno v: Soil Science Society of America Journal. 60:1901-1907

Crop growth and yield are known to be limited by A horizon thickness and may be related to more abundant and metabolically active roots in A than B horizon soil. The influence of A horizon thickness on root distribution and rhizosphere pH was observe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f6297de38d5ce583547b56bd3f396032
https://doi.org/10.2136/sssaj1996.03615995006000060040x

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MICROSCALE PH SPATIAL DISTRIBUTION IN THE AP HORIZON OF MEXICO SILT LOAM

Autor: R. W. Blanchar, R. D. Hammer, J. Yang

Publikováno v: Soil Science. 160:371-375

Conventional pH measurements treat soil pH as a random, independent variable for providing the mean pH of soil samples. This is assumed to represent the unsampled neighborhood. However the measurement will be inadequate if spatially dependent heterog

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3eae4150fb3bc1f64caffd5245598ebf
https://doi.org/10.1097/00010694-199511000-00006

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Slope Class Maps from Soil Survey and Digital Elevation Models

Autor: N. C. Wollenhaupt, T. L. Barney, T. W. Haithcoate, R. D. Hammer, F. J. Young

Publikováno v: Soil Science Society of America Journal. 59:509-519

Special-purpose land use maps based on slope attributes form digital elevation models (DEMs) often are produced with geographic information system technology. Field verification is lacking for accuracy and precision of computer-generated slope class

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::416ef5b3b1a667bb67fc8c602c15221f
https://doi.org/10.2136/sssaj1995.03615995005900020034x

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