for the double purpose wheat cultivation, to obtain genotypes that simultaneously optimize both productions is necessary. understanding the interplay between forage yield and seed yield components is very important. therefore, the objective of this work is to ascertain the cause-effect relationship and assess the relative importance of agronomic yield components. the essay was conducted in cabildo (buenos aires, 38th 36'south and 61 ° 58'west). we compared seven. long-cycle wheat varieties on standard plots for wheat, using a randomized complete block design with four replicates. the seeding date was 03/03/2000. of each treatments eight plants per cultivar were sampled and number of tillers, total leaf number, dead and alive, leaf area, aerial dry weight, when each variety achieved the double ridge state, and yield of forage( dry matter/ m2), cutting on the same date, were measured. when the grain was ripe the filled and empty spikelets number, grains/spike number and grain/spike weight on each plant sampled, in addition to spikes number per unit area; 1000 grain weight and yield (grain weight / m2) were measured. on both data sets phenotypic correlations were calculated, and standard partial regression method known as path coefficient (li, 1956) was applied to partition the correlation. despite the high and significant values of r and (r2), the variability of the material conditioned the relationship of these variables, so only through the af and n ° g / pl changes in grass and grain performance, respectively, could be achieved as the variables considered are so strongly linked to the long cycle condition with early plantings, this could be the criterion to be considered, which would greatly simplified the selection.