Abstract
This study was conducted to evaluate the performance of thirty three synthetic varieties of white maize in addition to the local variety (Bohoth 106) which obtained from Centro Internacional de Mejoramiento de Maiz Y Trigo (CIMMYT).The synthetic varieties were planted in two seasons ; spring and autumn at the first of April and the twelfth of July 2008 in farms of Al-rahmanya village near Mosul University by using randomized complete block design with three replications.The studied characters were: tasseling and silking date, plant height, plant ears, maturity date, ear diameter, ear rows, ear grain, 500 grain weight , grain yield per plant and oil and protein percents. The synthetic varieties showed significant difference in all the studied characters in spring season, also all the characters except silking date in autumn season.The synthetic variety Bohoth 106 showed more earliness in tasseling and silking date, while the synthetic variety SO3 TLW-Bm-RE gave higher number of plant ears in spring season. In autumn the SO3TLW-2-AB gave higher yield per plant and SO5 TLWQ-HG-B showed superiority in oil and protein percent. The grain yield gave high significant negative genotypic correlation with number of days to tasseling , silking and maturity but positive with plant height, and ear grain. The selection index including grain yield, number of days to tasseling and silking, ear rows was the best one which gave high relative efficiency.
