What are the main purposes of fertilizers and what are the outputs of cattle farming? Calculate the yield for crop Q, expected yield for crop R, and area required for crop S.

These nutrients are vital for healthy growth, development of strong roots, lush foliage, and increased fruit or seed production.

The main reason for applying fertilizer during plant growth is to replenish soil nutrients and enhance plant growth and yield.

The second and third outputs are meat and milk.

Yield (Y) is unknown.
Area planted = 2.0 Hectares
Expected Yield = 5.2 tonnes

$\text{Yield} = \frac{\text{Expected Yield}}{\text{Area planted}}$.

The yield for crop Q is $\boxed{\text{2.6 tonnes/hectare}}$.

Yield = 1.7 tonnes/hectare
Area planted = 5.0 Hectares
Expected Yield (E) is unknown.

$\text{Expected Yield} = \text{Yield} \times \text{Area planted}$.

The expected yield for crop R is $\boxed{\text{8.5 tonnes}}$.

Yield = 2.3 tonnes/hectare
Expected Yield = 11.5 tonnes
Area required is unknown.

The area required for crop S is $\boxed{\text{5.0 Hectares}}$.