Abstract: Leaf water potential (y leaf) was measured in culture solution in hydroponic system under controlled condition of the two crosses involving diverse rice genotypes to investigate the inheritance pattern and heritability. Polygenes were involved in this trait and theψleaf was governed either by no-dominant or partial dominant alleles and that was controlled by genes with additive effects in upland and hill rice. The heritability estimates were low (25-28%). Leaf water potential was significantly and positively correlated with root thickness, root volume, root length, plant height and leaf area in one of the two crosses. Negative relationship was found with shoot dry weight.