الفهرس 
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Abstract
Nadia Issa Azeez Al-Hwaidi. Study on growth, yield, yield components and nutritive value of two barley cultivars as affected by sowing date and harvesting dates published master of Science in Agriculture Science, Department of Agronomy, Faculty of Agriculture, Benha University, 2021.
Two field experiments were conducted at Moshtohor region, Kalubia Governorate, Egypt, in 2019/2020 and 2020/2021seasons, to study the effect of three sowing dates and three harvesting dates on growth, yield and yield components as well as nutritive value of two barley cultivars. The experimental design was a Randomized Complete Blok Design using a split split-plot with three replicates. The three sowing dates were allocated with main-plots and two barley cultivars were randomly distributed in the sub-plots, while the three harvesting dates were arranged random in the sub sub-plots. The area of sub sub-plot was 3.5mx3m= 10.5 m2 (1/400 fed).
The results could be summarized as follows:
1- Sowing on 1st or 15th of November gave the highest values of all studied traits, except spike length and harvest index in the first season and No. tillers plant-1, plant height in the second season.
2- Bhoth 244 cultivar gave the highest values of No. tillers plant-1, spike length, No. spikelets spike-1, spike weight, No. grains spike-1, grain yield fed-1 and straw yield fed-1, whereas Giza 2000 cultivar gave the highest values of heading date, flag leaf area, plant height, 1000-grains weight and harvest index in both seasons.
3- Harvesting at 150 days increased significantly plant height, spike weight, No. grains spike-1, 1000-grains weight and straw yield fed-1 compared with the other harvesting dates, while spike length, No. spikelets spike-1, grain yield fed-1 and harvest index increased significantly by harvesting at 180 days in both seasons.
4- the interaction effect, among sowing date, barley cultivars and harvesting date were significant differences of heading date, plant height, spike weight, No. grains spike-1, 1000-grain weight, grain yield fed-1, straw yield fed-1 and harvest index in both seasons, except straw yield fed-1 and harvest index as well as all studied traits of nutritive value for barley grains and flour were significant in average two seasons.