soiltestcorr

A compilation of functions designed to assist users on the correlation analysis of crop yield and soil test values. Functions to estimate crop response patterns to soil nutrient availability and critical soil test values using various approaches such as: 1) the modified arcsine-log calibration curve (doi:10.1071/CP16444); 2) the graphical Cate-Nelson quadrants analysis (Cate & Nelson (1965)), 3) the statistical Cate-Nelson quadrants analysis (doi:10.2136/sssaj1971.03615995003500040048x), 4) the linear-plateau regression (doi:10.2307/2529422), 5) the quadratic-plateau regression (doi:10.2134/agronj1994.00021962008600010033x), and 6) the Mitscherlich-type exponential regression (doi:10.2134/asaspecpub29.c1). The package development stemmed from ongoing work with the Fertilizer Recommendation Support Tool (FRST) and Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification (SIIL) projects.

Last 30 days

This package has been downloaded 277 times in the last 30 days. More than a random curiosity, but not quite a blockbuster. Still, it's gaining traction! The following heatmap shows the distribution of downloads per day. Yesterday, it was downloaded 8 times.

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Last 365 days

This package has been downloaded 4,037 times in the last 365 days. That's enough downloads to impress a room full of undergrads. A commendable achievement indeed. The day with the most downloads was Apr 17, 2024 with 55 downloads.

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