A study of dry matter accumulation and N, P distribution andrn, ther agronomic characters was conducted on two hybrids of maizern(Zea mays ~.) and their parental lines.rnHighly s i gnificant di fference was observed in total and earrndry matter accumulation among the genotypes, the growth stagesrnand growth stage by genotype interacti on. The highest t otal and earrndry matter were produced a t the final stage of maturity. The analysisrnof l e af and stalk dry ma tter indicated that there was highly signj f '_'Oantrndifference among genotypes and growth stages. Howevere, there was norninteraction. I n general a decreasing tendency of dry matter accumulationrnwas observed in the non grain part as growth stage advancences.rnThis loss is assumed to be due to trans location of carbohydrat~ B t ornthe grain late in the season as grain development advances. Thernassocia tion bet ween l eaf number and total dry matter production wasrnfound t o be positive and significant (r= 0.86). 31 .4% and 68.6% averagedrnover all the geno types was grain and non grain , respectively. Therntransl ocati on of shoot dry matter into the ear indicated that H611rnrnand its parental lines are more efficient than S.R. 52 and itsrnparental lines. Highest harvest index of 0.44 and 0.43 was producedrnby H611 and SR52 , respective ly. Further more, an increasing andrna decreasing trend of dry matter production was obs erved in therndifferent plant parts as growth stage advances e xcept for the ear and 'rngrain . From this study it could be suggested tha t, Parental lines which ..rnLrnare effic~nt i n production and distribution of dry matter should bernincluded in future breeding program t o produce high yi e lding hybrids.:rnThe differences observed in the production and translocation of dryrnmatt er aft e r flowering suggested that genotypes having such charactersrnare very impor tant. Eventhough, it is imposible to point out arnparticular growth stage a t which hybrid vigor is expres ssed , insectrnpests , diseases , moisture and mutri ent deficienci es which affect thernrate o f l eaf development should be ~void e dÂ· inorder to have a healthyrnplant growth for muximum yie ld production.