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  1. A study of the value of crop rotation in relation to soil productivity /
    By: Weir, Wilbert Walter,
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1926.
    Subjects: AgSpace  crop production  Crop rotation  crop yield  experiment stations  Fertilizers  Internet resource  land management  long term experiments  research methods  Rothamsted  Soil management  Soil productivity  Yields  
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  2. Soil productivity indexes for Illinois counties and soil associations / [prepared by P. W. Mausel, E. C. A. Runge, and S. G. Carmer].
    By: Mausel, P. W. - Carmer, S. G. - Runge, Edward C. A.
    Publication info: Urbana :University of Illinois at Urbana-Champaign, College of Agriculture, Agricultural Experiment Station,1975.
    Subjects: Illinois  Soil productivity  Soils  
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  3. Distribution of active ectomycorrhizal short roots in forest soils of the inland Northwest : effects of site and disturbance /
    By: Harvey, A. E. - Intermountain Research Station (Ogden, Utah)
    Publication info: [Ogden, Utah] :U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station,1986.
    Subjects: Ectomycorrhizas  Northwestern States  Soil management  Soil microbiology  Soil productivity  
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