phosphorus

The data originate from the long-term Exhaustion Land field trial at Rothamsted Research, which examines the relationship between crop yield and soil fertilizer inputs. In 1986, the yields of spring barley (variate Yield) were recorded from 20 plots. For each plot, the available soil phosphorus content was also measured using the Olsen P method (variate OlsenP). This dataset allows for the analysis of how variations in soil phosphorus levels influence barley yield under field conditions.

datasets

All data in the book "Statistical Methods in Biology" by Welham et al. (2015) <doi:10.1201/b17336> with a corresponding documentation and illustrative analysis of the data.

Emi Tanaka

smbdata

Data from "Statistical Methods in Biology"

Sue Welham

Salvador Gezan

Suzanne Clark

Andrew Mead

phosphorus function

A data frame with 3 variables: <code>DPlot</code>, <code>OlsenP</code>, <code>Yield</code>.<dl>
 <dt>DPlot</dt>
<dd>Factor. Unique identifier for each field plot.</dd> <dt>OlsenP</dt>
<dd>Numeric. Available soil phosphorus content measured as Olsen P (mg/kg or ppm).</dd> <dt>Yield</dt>
<dd>Numeric. Yield of spring barley from each plot (typically in tonnes per hectare, t/ha).</dd>
</dl>

Format

Olsen Phosphorus — phosphorus

A data frame with 3 variables: <code>DPlot</code>, <code>OlsenP</code>, <code>Yield</code>.<dl>
 <dt>DPlot</dt>
<dd>Factor. Unique identifier for each field plot.</dd>

 <dt>OlsenP</dt>
<dd>Numeric. Available soil phosphorus content measured as Olsen P (mg/kg or ppm).</dd>

 <dt>Yield</dt>
<dd>Numeric. Yield of spring barley from each plot (typically in tonnes per hectare, t/ha).</dd>


</dl>

phosphorus: Olsen Phosphorus

Description

Usage

Arguments

Format

Examples