Productivity of sunflower reached a plateau in recent years due to poor seed filling and seed set, excessive vegetative growth and lack of photosynthetic activity at the time of seed filling and improper translocation of photosynthates. To improve the productivity, translocation of photosynthates from vegetative organs to seed is very important. In this direction to achieve higher yield, a field experiment was conducted to study the influence of source and sink manipulations on crop growth and yield in sunflower hybrid, KBSH-44 by manipulating the source size and sink capacity by applying plant growth regulators, growth retardant, higher dose of nitrogen with micronutrients and source size was reduced by defoliation. Application of double dose of nitrogen at sowing with micronutrient mixture markedly increased growth parameter indices and it had a profound effect on oil content too. Total biomass increased significantly due to more vegetative growth which in turn increased harvest index. This treatment resulted in 33.8 % increase in leaf area duration which improved seed yield by 32.6 %. Manipulation of sink capacity by spraying 240ppm TIBA with 120ppm NAA and 0.2% boron improved the rate of translocation which in turn increased the productivity by 33 to 36 percent. Due to more biomass and yield, harvest index was also increased by 32 percent. Application of 3000ppm cycocel at star bud stage increased productivity by 1.2 per cent and significantly reduced the plant height which minimized the distance between the source and sink thereby enhancing the rate of translocation of photosynthates especially during grain filling period.