Effect of Soil Type Differences on Crop Yields on Clarion‐Webster Soil in Iowa¹

Abstract

Sypnosis Several different methods of evaluating the relative effects of soil type differences on crop yields obtained in a long time rotation‐fertility experiment at the Agronomy Farm, Ames, Iowa, are presented. All methods of analysis used indicate that yield differences are associated with soil type differences. The relative productivity of the different soils was found to be dependent upon the crop and management system under consideration.

The Significance of Subsoil and Soil Series in Nebraska Soil Testing1

“…It is logical that readily discernible profile characteristics of the soil series should have a bearing on the nutrient economy of crops grown on that soil. Some attempts have been made at establishing the fertility connotation of the soil series (2,5,6,8,10,11), but much work remains to be done.…”

Class separability, correlation to biomass, parsimony and homogeneity of classes as criteria to decide on the goodness-of-classification when comparing Hungarian soil classification to World Reference Base inside a slightly saline plot

“…The most widespread classification systems, USDA Soil Taxonomy and the World Reference Base for Soil Resources (WRB) (ROSSITER et al, 2017;ESFANDIARPOUR et al, 2018;SALEHI, 2018) were compared according to parent material (SOROKIN et al, 2021), classification levels, physical and chemical properties, and other features by many researchers. SHRADER et al (1960) WEBSTER et al (1977, ALLGOOD & GRAY (1978), OGUNKULE & BECKETT (1988), BUOL et al (2011 studied the utility of soil classification systems for predicting selected properties and productivity, and our work follows this tradition.…”

Knowledge and decision support for variable rate application of materials in prescription farming

“…While it is true that, on average, different soil types have different yield potentials (Odell and Smith, 1940;Shrader et al, 1957), in fact, it is veiy difficult to establish a strong correlation between yields and fertility or soil type at a specific location (Tisdale etal., 1985, Chapter 2;Karlen, 1993;Birrell et.al., 1993). Consider, for example, the simimaty given Birrell et al (1993, page 7) of a two year stutfy mapping yields and nutrient levels:…”