Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Alexandru BRAN1, Viorel ION
For a given sunflower hybrid, even the length of the growth period is a specific characteristic, this being determined by the genetics of the hybrid, this is influenced between some limits by the growing conditions. These limits of variation are important to be known by the farmers as they could predict the time when the plants reach a certain growing stage or the maturity. The aim of the present paper is to identify the variation limits of the growth period of an assortment of 18 sunflower hybrids cultivated in 2018 and 2019 in five locations covering the most important regions for growing sunflower in Romania. Sunflower hybrids behave differently regarding the duration of the growth period, according to the specific growing conditions of the location and the year. The variation limits of the growth period at the sunflower hybrids studied in the five location from the most important regions for growing sunflower in Romania and in the years 2018 and 2019 were of 52-74 days for the period from emergence to beginning of flowering process (10% flowered heads) and of 101-135 days for the period from emergence to maturity.
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