Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

Hybrid seed set on the female line depends primarily its flowering synchronization with restorer (R), therefore, sowing of male and lines must be planned properly to achieve this. Field experiments different dates (May 1st, May 15th, 30th) R (Giza 178R, Giza 179R, 181R) cytoplasmic sterile (CMS) (IR69625A, IR70368A, IR58025A, K17A, G46A) were carried out at farm Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt during 2019 2020 study effect in hybrid rice. The results indicated that between CMS has highly significant effects days 50% heading, number leaves, effective accumulated temperature (EAT), plant height, panicle exertion percentage, length, fertile panicles, weight, harvest index yield highest (1.72 1.41 t ha−1, respectively 2020) was recorded from date 1st combination 178R × IR58025A (2.06 2.12 ha−1 2020, respectively). grain had a positive correlation height (cm), panicles plant−1, index. In Egypt, is best time for rice may recommended better performance.