Published in Scientific Papers. Series A. Agronomy, Vol. LVII
Written by Viorel ION, Georgeta DICU, Marin DUMBRAVĂ, Adrian Gheorghe BĂȘA, Georgeta TEMOCICO, Daniel STATE, Lenuța Iuliana EPURE
There are several annual crops suitable to supply important biomass yields to be used as raw material for producing different kinds of energy, including the possibility to be used as substrate for biogas production. Sunflower is counted among these crops of great importance. Producing biomass in an efficient way become possible by using the most appropriate cultivation techniques and sunflower hybrids according to specific growing conditions. The aim of this study was to identify how the row spacing and plant population, associated with different soil and climatic conditions and cultivated sunflower hybrids are influencing the above-ground biomass yield at sunflower. Researches were performed in field experiments in 2013, in two locations from South Romania, respectively Fundulea (44o28’ N latitude and 26o27’ E longitude) from Călărași County, and Moara Domnească (44o29’ N latitude and 26o15’ E longitude) from Ilfov County. The studied sunflower hybrids were the followings: Pro 111, LG56.62, P64LE19, Pro 953. Each hybrid in the two locations was studied under three row spacing (75 cm, 50 cm, and twin-rows of 75/45 cm) and three plant populations (50,000, 60,000, and 70,000 plants ha-1). Determinations were performed in the early dough - dough plant growth stage taking into account that the biomass yield in this growth stage of the sunflower plants is of importance as raw material for biogas production.
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