1. past tense and past participle of fertilise; to make soil or land more fertile by adding nutrients or organic matter
Usage: British English spelling (American English: fertilized); commonly used in agriculture and gardening
2. past tense and past participle of fertilise; to cause an egg or plant to develop by introducing male reproductive material
Usage: British English spelling (American English: fertilized); used in biology and reproduction contexts

Examples

• The farmer fertilised the fields with compost before planting the crops.
• The soil had been fertilised with nitrogen to improve its quality.
• The egg was fertilised and began to develop into an embryo.
• They fertilised the garden with organic matter to help the plants grow.
• The flower was fertilised by bees carrying pollen from other plants.
• After the land was fertilised, the grass grew much greener and thicker.