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2022. 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. Pakistan Journal of Science. 64, 2 (Dec. 2022). DOI:https://doi.org/10.57041/vol64iss2pp%p.