R code analysis-ANOVA and Tukey Test on Effects of soil microbes on plants

This R code is a run down of the analysis done on the effects of soil microbes on plants under drought conditions. This code involes an ANOVA and Tukey Test. 

The data set includes results from biomass weights following 8 weeks of watering treatments (high and low) on native California plants (Phacelia parryi and Stipa pulchra) grown in soil inoculated with drought-tuned or ambient soil microbes. High: plants were watered every other day. Low was used to induce drought and plants were watered only when wilting. Ambient and drought-tuned microbes were collected from a long-term field water-manipulation experiement.