KA5

How dose fertiliser increase crop yield

Adding nutrients to the soil

Explain the process of algal bloom

Fertiliser travel through the soil into neer water the algal population increases causing algal bloom, this then stops light from reaching the water this kills aquatic plants, this provides food for bacteria, the bacteria uses up more oxygen in the water, no oxygen for aquatic animals they are killed biodiversity decreases

Why do farmers spray pesticides

To protect crops by killing pests and other plants

What are alternatives

Geneticly modified crops