Fertility (noun)

1. The natural ability to produce offspring.
2. The ability of land or soil to produce crops or plants.
3. The productive capacity of an area of land or soil, especially with reference to the quality and quantity of crops produced.

Origin:

Late middle english: from latin fertilis, from ferre "to bear".

Examples:

1. The couple sought medical help to increase their fertility.
2. The high fertility of the soil was ideal for growing crops.
3. The fertility of the land declined due to overuse and neglect.
4. Her advanced age was affecting her fertility.
5. The fertility clinic offered a range of treatments to help couples conceive.