A tractor spreading pig manure on a field. This is usually done before ploughing and planting a new crop during the winter season. Pig manure contains nitrogen compounds which are used by the plants for their growth. An inappropriate use of nitrogen fertilisers represents a major hazard for the environment if nitrogen compounds find their way to ground waters,rivers and lakes | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Nunuk, David |
Taille de l’image : | 5431 px × 3643 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |