** Norwegian fertilizer producer Yara's YAR.OL shares rise 4.3% after Q1 EBITDA beat, driven by higher volumes and improved margins
** The company says results were also supported by ongoing cost cuts and portfolio optimization, positioning it for continued growth amid a tightening nitrogen market
** "We are pleased with reporting an improved first quarter result, as a solid commercial and production performance has led to higher deliveries and improved margins," CEO Svein Tore Holsether said
** Jefferies highlighted Yara's strong EBITDA beat, driven by volume growth, price realisation and cost control
** If gains hold, shares will be on track for a best day since September 2024
(Reporting by Jesus Calero)
((jesus.calero@thomsonreuters.com))