**5.1 Unique properties of nano-particles (NPs)**

a. Very high specific surface area (**Figure 2** and **Table 1**)

### *Enhancing the Productivity of Field Crops through Nano-Fertilizer DOI: http://dx.doi.org/10.5772/intechopen.101146*

#### **Figure 2.**

*Probable mode of cellular uptake of nanoparticles in a plant cell [5].*


#### **Table 1.**

*Properties of various kinds of nano-fertilizers.*


#### **5.2 Classification of NPs**

(a) Carbonaceous NPs, (b) metal oxide NPs, (c) zero valent metals and (d) nano-polymers (**Figure 3** and e.g., **Tables 2–4**).

#### **Figure 3.**

*Novel properties of nanoparticles: surface area per unit weight increases, so more atoms come on the surface to interact occurred in nanoparticles.*


#### **Table 2.**

*Nano-scale fertilizer inputs.*


#### **Table 3.**

*Nano-scale fertilizer additives.*


#### **Table 4.**

*Nano-scale films and host materials.*
