Four sulphur sources, i.e., ammonium sulphate, potassium sulphate, calcium sulphate, and ferrous sulphate, each at 0.5 mM of SO4 in the root medium, were used to grow sunflowers under controlled conditions. Five harvests with the time intervals of 0, 6, 24, 48, and 16g hours were taken. Root and shoot growth was proportional to the time irrespectively of the sources. significant relationships (r=o.99) were shown by fresh weight and dry matter yield (DMY) with respect to the harvest time, irrespective of the sources. Ammonium sulphate and ferrous sulphate shared a positive relationship with SO4 uptake (r=0.85) in the root. After 48 hours, the various sources showed distinct contributions for root DMY.