STUDIES ON HYBRID RICE SEED PRODUCTION OF EGYPTIAN CYTOPLASMIC GENETIC MALE STERILE LINE SAKHA 1A / B MULTIPLICATION

Two field experiments were carried out at the Experimental Farm of Sakha Agriculture Research Station, Egypt during the two successive seasons of 2014 and 2015 to study the effect of four wind directions, northsouth (W1 ), west-east (W 2), north west-south east (W3) and north east-south west (W4 ), five date of sowing intervals including 0, 3, 5, 7 and 9 days intervals between A and their B lines to get proper synchronization of flowering between the parental lines in the seed production plot and supplementary pollination during flowering period on important yield characters of hybrid rice seed production of cytoplasmic male sterile line (Sakha 1A) and their maintainer Sakha 1B) which used to produce hybrid rice seeds for EHR1,EHR2,EHR3 and other hybrids. Asplit split plot design with four replications was used. The main plot were devoted to the four natural wind direction, north-south (W1), west-east (W2), north west-south east (W3) and north east-south west (W4 ), while the dates of sowing intervals was arranged at random in the sub plots and the supplementary pollination.The highest F1 seed yield (2648.2 kg ha-1 and 2611.9 kg ha-1) ofCMS hybrid seed were obtained with an application of wind direction northsouth
(W1) and north east-south west (W4), respectively.The first date, 1o May for Sakha1A and 12, 15 May for their B with seed intervals of 3 and 5 days (D1) gave the maximum grain yield (2662 kgha-1) followed by the third date (2503.9 kg ha-1), 10 May for Sakha 1A and 15,17 and 19 May for their Sakha 1B with seed intervals of 5, 7, and 9 days (D3).Application of supplementary pollination (S2) significantly increasedgrain yield (3034.6 kg ha-1) while, the lowest one was obtained withoutsupplementary pollination. The all possible interaction between the three factors, wind direction, date of sowing and supplementary pollination affected significantly on grain yield and the other traits which studied in both seasons.