Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 1
Written by Nesho NESHEV
The influence of the crop rotation on sunflower (Helianthus annuus L.) yield and yield components is limited. Therefore a study in three consecutive growing seasons of sunflower (2018, 2019, and 2020) was conducted. The trial was performed on the experimental field of the department of “Agriculture and herbology” at the Agricultural University of Plovdiv, Bulgaria. The experiment was performed by the long plots method. Two crop rotations were evaluated: 1. Winter wheat - sunflower and 2. Sunflower - sunflower (monoculture). All evaluated parameters of sunflower as plant height at the end of the vegetation, head diameter, seed yield, seed oil content, as well as the absolute mass of 1000 seeds and hectoliter seed mass were influenced by the preceding crop. The highest results for the rotation of winter wheat - sunflower were reported, while statistically lower results for the sunflower monoculture were found.
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