Abstract
Parental lines of hybrid rice-A lines (IR62829A and IR58025A), B lines (IR62829B and IR58025B), and R lines (IR10198-66-2R, AS 89044, and Pusa 150R)-were raised at monthly intervals from August 1994 to July 1995. The recommended cultivation practices were adopted and observations were made in 10 randomly selected plants from each population. During the cropping period, data on maximum and minimum temperature and hours of sunshine and daylength were obtained from agrometeorological documentation records. From this, heat unit concepts-growing degree days (GDD), relative temperature disparity (RTD), photothermal units (PTU), and heliothermal units (HTU)-were derived for correlation and regression studies. Variations were observed in different parameters, not only because of genotype characters and seasonal influence but also because of the interaction between them. Most floral characters were better expressed in the summer season (February to May) than in the samba season (October to January).
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