Impacts of nitrogen fertilization and planting date on the physiology and yield of purple sweet potato at the extreme Northern edge of cultivation. by Ivar Zekker, Astrid Kännaste, Viacheslav Eremeev, Kaia Kask, Pille Meinson, Helina Nassar, Erkki Mäeorg, Eve Runno-Paurson, Ülo Niinemets

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