Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Ioan RADU, Lorena-Roxana GURĂU
Morphological characteristics of six sunflower hybrids with different precocity were assessed to notice the effect of sowing time (ST). ST was set taking into account the Celsius degrees at the soil depth of 7 cm at 7 a.m.: ST1 at 5oC, ST2 at 7oC and ST3 at 9oC. The research was performed in the field experiments in Tulcea County in 2021 under rainfed conditions. The number of leaves per plant increased upon the sowing delay from 27.7 at ST1 to 30.9 at ST3, while the number of days from sowing to flowering decreased from 62.7 at ST1 to 48.5 at ST3. Stem diameter had the highest value at ST2. The average plant height for the five hybrids increased from ST1 to ST3. ST2 provide the highest head diameter (19.8 cm) followed by ST1 (19.3 cm) and ST3 (18.5 cm).
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