Reference

Elke Bloem, S. Schroetter, Abdallah S.M. El-Khayat, Ewald Schnug (2011): Influence of Sulphur and Nitrogen Supply on the Pigment Content of Oilseed Rape, Marigold and Beetroot – Phyton, Annales Rei Botanicae, Horn – 50_2: 301 - 317.