Photosynthetic activity and productivity of durum wheat (Triticum durum Desf.) affected by certain preparations and various terms of sowing

P. Nikolov1*, G. Delchev2 1Institute of Agriculture and Seed Science “Obrazcov Chiflik”, 7007 Ruse, Bulgaria 2Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 31 May 2021; accepted for publication 23 July 2021)
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