**3. Results**

There was a significant interaction between the cropping systems (C) and mineral fertilization (M) for all growth variables, as well as for the dry mass of the morphological components and total sorghum production in the double crop. However, plant height (PH), panicle length (PL), and panicle dry mass (PDM) had no significant interaction between cultivation systems and mineral fertilization (Table 3). The leaf content of P and the sorghum yield in the double crop presented no interaction between the variables (C × M). Moreover, the foliar contents of N, K, and Mg also presented no interaction (C × M) (Table 4).


**Table 3.** Summary of the analysis of variance of the growth components as well as the dry mass of the morphological components and total forage sorghum

Plant height (PH), stem diameter (SD), panicle diameter (PD), panicle length (PL), leaf dry mass (LDM), stem dry mass (SDM), panicle dry mass (PDM), dry mass of the dead material (DMDM), total green mass (TGM), total dry mass (TDM), and root dry mass (RDM). \* = Significant at 5% probability; ns = Not significant. **Table 4.** Summary of the analysis of variance of the stem leaf ratio, foliar macronutrient content, and forage sorghum yield submitted to the combination of alleys and mineral fertilization.


*Agronomy* **2019**, *9*, 636
