Don't understand difference between Number of runs and replications
Hello,I am trying to design a sugarcane fertilization experiment with 4 levels of nitrogen, 3 levels of phosphorus, and 3 levels of potassium in a fractional factorial design. I got this design with 12 runs :Can I use only 12 plots (= to 12 runs) or should use replications (3 or 4 replications) of the 12 runs ? Thank you for your help.