Give a full explanation why it is not recommended to spread nitrogen fertiliser on grassland in late autumn. - Leaving Cert Agricultural Science - Question h - 2014

The application of nitrogen fertiliser can lead to leaching, especially during autumn rains. This process can wash nitrates away from the root zone and into water bodies, causing environmental issues.

When nitrogen is not absorbed by the grass, it can contribute to denitrification. This process releases nitrogen gases into the atmosphere and can lead to pollution of groundwater and surface waters.

Spreading nitrogen fertiliser in late autumn is often wasteful. Because grass growth slows down in the colder months, the fertiliser is less likely to be used effectively by the plants.

Lower temperatures during autumn inhibit the activity of soil bacteria that are essential for nitrogen uptake by plants. This further reduces the effectiveness of applied nitrogen fertiliser.