الارتباطات الوراثية و المظهرية و دليل الانتخاب للحاصل و مكوناته في الهجن الفردية المدخلة من المركز الدولي لتحسين القمح و الذرة الصفراء Zea mays L. و الثلاثية للذرة الصفراء

Abstract EN

This study was conducted to evaluate the performance of twenty eight hybrids of maize introduced from Centro Internacional de Mejoramiento de Maiz Y Trigo (CIMMYT).The hybrids were planted in two seasons; spring and autumn on 1/4/2008 and 12/7/2008 in farms of Al-Rahmanya village near Mosul University.

The studied characters were: tasseling date, silking date, plant height in both seasons, as well as maturity date, ear diameter, ear rows, ear grains, 500 grain weight, grain yield per plant and oil and protein percentage in the autumn season.

The hybrids showed significant differences in all studied characters in both seasons .CMS043016 hybrid was early in tasseling and silking in the spring season, while CMSQ04301 and CMTQ03307 hybrids were earlier in tasseling and silking, respectively in the autumn season.

CMSQ04300 hybrid gave higher row number and grain number in ear, grain yield per plant and oil percentage; while CMSQ04301 hybrid showed superiority in protein percentage in the autumn season.

The grain yield gave high significant negative genotypic correlation with silking date, but positive correlations with plant height, ear length and diameter, row number and ear grains and 500 grain weight.

The selection index including grain yield, ear length and diameter, ear rows and ear grain was the best one which gave high relative efficiency.