Reproducing analysis of Sirius model simulations of wheat yields, 1892-2016

R Markdown file showing analysis steps for graphics showing simulated wheat yields and harvest index from 1892-2016 from the Sirius model using observed meteorological data for Rothamsted, Hertfordshire, UK, combined with both observed CO2 levels from 1892 to 2016 and the CO2 level fixed at the 1892 value, for three cultivars (Claire, Mercia, Avalon) with contrasting growth characteristics.