الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 78 |  |  |
| | | from | 78 | | |
Abstract
Multi-cut gene pool of barseem was represented by four distinguished populations. These were; Khadarwi, Meskawi, Serow and Helaly. In (2014- 2015) winter season, seeds of the four populations were sown at the rate of 31.4 kg.ha-1 in hand drilled rows 4.0 m long and 20 cm apart (2.5g per plot). Populations were timely isolated by allowing a successive flowering started with Meskawi population, then Serow, then Helaly and finally Khadarawi populations. At flowering, 300 plants with overall visual characters in each population were selected. Those plants were left for open pollination and some heads were set in paper bags for self seed-setting .Seeds from each plant were harvested separately to represent a half-sib family. One hundred half-sib families from each population with adequate seed were saved. In (2015-2016) winter season, half-sib families of each population were evaluated in a separate experiment. Ten random plants from each plot were used to measure number of head.plant-1 , number of seeds.head-1 , seed weight.head -1, 1000 seed weight and total seed weight.plant-1. According to the results of evaluation the highest as well as the least seed yield producing five families in each set, were identified. This resulted in selection intensity of 20%. In the same 2015/2016 season, S1 seeds of the 100 evaluated half- sib families were planted in isolated strip. Depending on families evaluation, the excluded families were uprooted before flowering. selected families had allowed for intercrossing to produce seeds of the first cycle of half- sib family selection for high and low seed yield.