Agronomic features
LAI
The water deficit and hybrid as well as the interaction of WD×H had the significant effect on the leaf area index
(Table 4). The means comparison showed that the water stress reduced LAI and the most reduction effect obtained
from I3 treatment (Fig 2). In well-irrigated treatment, the Euroflor and Allestar hybrid had the highest and lowest LAI,
respectively. While, the difference in LAI was not significant among Euroflor and Karaj hybrid. In moderate water deficit,
the LAI among hybrids had a decline order of Euroflor› Karaj› Azargol› Allestar. In extreme irrigation deficit, the
highest and lowest LAI was observed in Euroflor and Allestar hybrids. Although, the difference in LAI was not significant
among Euroflor and Karaj hybrids (Table 4). There was a high and negative relationship between LAI and seed
yield under water deficit conditions (Table 6 and 7).