Two field experiments were carried out at Gemmeiza Agricultural Research
Station in 1999 and 2000 seasons to study dynamics of yield of fourteen white and
yellow maize hybrids. These hybrids were nine white single and three way crosses
i.e. SC10. SC21. SC22. SC23 and SC24, TWC321. TWC 322.TWC 323 and TVVC
324; and five yellow Single and three-way crosses i.e. SC 51. SC52 and SC 155;
lWC 351 and lWC 352. Results obtained can t.G summarized as follows: •   1- Variety differences were obtained in growth parameters, t.e. grain yield and its
components. and pnotcsynthates partitioning. where maize hybrids differed in
glucose required for synthesis. carbon equivalent. yield energy per plant and/or
per ted. for grain and straw yield. biological yield per fed (above ground
biomass/fed). coefficient of crop index and harvest index.   2- Maize grain yield could be increased by growing white single crosses 10 and 22.
yellow single cross 155: white three way crosses 321 and 322 and the yellow
three way cross 352. where. these hybrids characterized by their highest value
from vegetative growth; grain yield and its components and photosynthetic
partitioning towards the economic yield in comparison with other eight white and
yellow hybrids under study.