Water requirement and the effect of simulated drought on several winter wheats

The water requirement on a grain basis and the length of epicotyl measured at a tension of 7 atmospheres after 7 days yielded a significant, high correlation. This indicates that the varieties which gave long epicotyl growth under stress were apparently the ones which required more water for grain production.;The varieties high in straw yield were low in water requirement. Minter, Blackhull and Yogo had a lower water requirement on a straw basis at both moisture levels.;The varieties in general had a higher water requirement on a straw basis at the low moisture level than those growing at field capacity. But on the grain yield basis the reverse situation was found.;The weight per kernel was found to be higher at the low moisture level than at field capacity.;Six varieties of winter wheat showed significant differences in water requirement on straw basis, straw yield and number of heads per pot at both levels of moisture under study.;High significant negative correlations were found between water requirement on a grain basis and grain yield as well as water requirement on a straw basis and straw yield.;A negative relationship was noted between grain yield and straw yield, though the ''r'' value was not statistically significant. This suggests the possibility that dwarf varieties may give a higher yield than the tall ones under drouth conditions,...