Amjed Ali. PHENOLOGY AND YIELD OF SUNFLOWER (HELIANTHUS ANNUUS L) HYBRIDS AS AFFECTED BY VARYING PLANT SPACING AND NITROGEN LEVELS UNDER SEMI ARID CONDITIONS OF SARGODHA, PUNJAB. PJS [Internet]. 2022 Dec. 27 [cited 2024 May 12];64(2). Available from: http://pjosr.com/index.php/pjs/article/view/496