The soil were collected from field and mixed thoroughly to assure uniformity. Soil was mixed with burnt rice husk. The mixed soil data analysis revealed a pH of 6.7, an organic matter of 1.16, and total nitrogen content of 0.04. Available P and extractable K were 176 and 96 ppm, respectively. The
proportions of sand, silt, and clay in the soil were 75, 18, and
7%, respectively. Temperature sums for each genotype in
each planting date were calculated from day after
transplanting to harvest (Table 2 and 3). Temperature sums
were calculated using the method described by Kocsis et al.
(2007a).