Stock Photo - 02 June 2022, Saxony-Anhalt, Halle: A tractor harrows a strip of field next to the Centennial Rye on the grounds of the Teaching and Research Station of Martin Luther University Halle-Wittenberg. Since 1878, rye has been grown here in a long-term trial with six different fertilization variants. After more than 140 years, clear differences in plant growth can be seen between the fertilized and unfertilized cultivation types. (Aerial photo with drone) (to dpa ""Expert: ""Eternal rye"" also serves nutrition of the future"") Photo: Jan Woitas/dpa. - Halle/Saxony-Anhalt/Germany

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