**3.5 Scatter plots and linear regression outputs of the relationship between fertilisers/nutrients and sorghum yields in Morocco**

In the context of nitrogen fertilisers used in sorghum cultivation, it can be observed that an R2 of 0.075 (7.5%) is obtained. This implies that only 7.5% of changes in sorghum yield can be explained by changes in nitrogen fertiliser application (**Figure 6a**). In terms of phosphate fertilisers used in sorghum cultivation, it can be observed that an R<sup>2</sup> of 0.23(23%) is obtained. This implies that only 23% of changes in


**Table 1.**

*Linear regression outputs of the relationship between maize yield and fertilisers.*


#### **Table 2.**

*Linear regression outputs of the relationship between maize yield, water withdrawal and fertilisers.*
