**2.5. Emissions and energy model**

**Type of burning Emissions factors (kg/t)**

**Figure 4.** Parameters used in the emissions and energy model.

**Figure 5.** Emissions and energy model developed in iThink®.

**Table 2.** Emissions factors.

72 Global Wheat Production

Headfire 11 64 2 Backfire 6 54 1.3

**PM CO CH4**

Based on the selected parameters and with the purpose of facilitating the analysis of the emissions associated with wheat straw burning during the 1987–2015 period, a dynamic model was developed on iThink®, whose simplified version is illustrated in **Figure 5**. The development of the model allows to establish and observe practically and graphically the interrelations of the different variables used to estimate the emissions corresponding to wheat straw burning and the quantity of energy generated during the combustion of the agricultural waste under study and associated emissions.
