Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 1
Written by Victorița MARIN, Lenuța Iuliana EPURE, Nicoleta ION, Viorel ION
Sunflower grain yield is positively correlated with head yielding elements (head diameter, the number of grains per head, the weight of grains per head and the 1000-grain weight - TGW), but the correlations of grain yield are stronger with some yielding elements and lower with some others. The present paper aims to identify the particular correlation of sunflower grain yield with head yielding elements according to row spacing and plant density. The analysed data were obtained in the research performed in 2019, 2020, and 2021 in field experiments under rainfed conditions located in four locations in Romania (one in East, one in South-East, and two in South Romania). The experimental factors were the following: Factor A – row spacing, with 3 graduations: a1 - 70 cm; a2 - 60 cm; a3 - 50 cm; Factor B – plant density, with 3 graduations: b1 - 50,000 plants/ha; b2 - 60,000 plants/ha; b3 - 70,000 plants/ha; Factor C – sunflower hybrid, with 4 graduations: c1 - KWS Acer; c2 - NK Neoma; c3 - P64LE25; c4 - Subaro. In the performed research, generally, the coefficient of correlation of sunflower grain yield with the head yielding elements decreases with row spacing decrease and increases with plant density increase. The highest correlation coefficient of grain yield was registered with grain weight per head and TGW regardless of row spacing and plant density. But regardless of plant density, as the row spacing decreases, it decreases the value of the correlation coefficient of grain yield with grain weight per head and increases the value of the correlation coefficient of grain yield with TGW.
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