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Phosphorous Nutrient Deficiency of Sunflowers, Helianthus Annuus Phosphorous Nutrient Deficiency of Sunflowers, Helianthus Annuus Phosphorous Nutrient Deficiency of Sunflowers, Helianthus annuus Ngoc Chau Tran Cal State Fullerton Abstract: The objective of this experiment was to determine whether or not a complete nutrient solution would have increased stem width, height, and leaf length compared to 25%.