The formula for CGR is {(mass 2 - mass 1) / (time 2 - time 1)} / ground area. I told our dean that I was making hay while the sun shines, and he wants verification. I harvested two 2-m2 field samples of alfalfa on a 10-day interval, and after drying the samples, the weights of the two samples were 1.289 and 2.925 kg. What is the crop growth rate in kg/m2/day