Finally, plant growth analysis is an integrative indicator. The relative growth ratio (RGR) can be expressed as a function of leaf weight assimilation rate (LWAR) and the leaf weight ratio or the weigth of leaves per total weight (LWR or leafiness) in the following equation:

RGR = LWAR ~ LWR

where LWAR=1/LW*dW/dt; LWR=LW/W; W=total weight;

LW=leaf weight;

RGR components are presented in Table 5. It can concluded that the reduced dosis of fertilizer with ROOTS® increases assimilation rate which means that increases leaf effciency.