BETEROSIS AND COMBINING ABILITY FOR EARLINESS AND YIELD COMPONENTS IN COMMON WHEAT (Tritium aestivum L.)

Abstract

Wheat is the world's most important strategic food crop. In EuDt it's the main winter cereal crop as it occupies approximately 2.5 million feddan producing 6.6 million tons. Moreover, wheat is the primary stable food source of the most Egyptian population, it's straw is an important fodder. Since 1 970,s attempts have been made to develop high yielding wheat cultivars aiming to decreasing its imports and to meet the consumption of the rapid growing