چكيده لاتين :
The effect of water deficit on growth and development, yield and yield components of maize at vegetative (V8) and grain filling stages (R3) was investigated. Six hybrids including three commercial hybrids (SC301, SC647, SC704) and three leafy hybrids (Leafyl, Leafy2, Leafy3) were evaluated. A split plot laid out a complete block design with three replications was used. Water deficit at vegetative stage caused delay in phenological stages, but stress in grain filling stage and both of two stages reduced the duration of reproductive stage. Biological yield was reduced, significantly, by stress at evaluated growth stages. In stress and control treatments, leafy hybrids had high potential in total and leaf dry matter production. Water stress during the both of vegetative and grain filling stages reduced the yield of all hybrids. SC704 and SC301 hybrids had highest and lowest reduction in grain yield with 43% and 32% losses, respectively. Furthermore, stress in grain filling stage had more destructive effect than vegetative stage on grain yield. Water deficit at both of two stages had most reductive effect on growth and development, stress at grain filling stage and water deficit at vegetative stage have less reductive effect, respectively.
