A Filed experiment was conducted in two consecutive seasons,2002/2003 and
200312004 at Gemmeiza Agricultural Research Station ,EL-Garbeia Governorate
(Middle Delta),to study the effect of late sowing date on yield and yield components of
five barley genotypes. Split Plot Design in three replications was used . Four sowing dates ( 1 st
December .is" December,1 st January and 15^th January) were arranged in the main
plots. Five barley genotypes were arranged randomly in the sub-plots. Data were recorded for heading date, maturity date , plant height , spike length ,
number of spikes 1m², number of grains Ispike , weight of kernels Ispike , grain yield,
straw yield and biological yield. The results could be summarized as follows : sowing dates and genotypes
treatments showed significant effect on grain , straw and biological yields as well as
yield attributes for both seasons with some exception. The highest values of grain , straw and biological yields were recorded for the
two sowing dates, Dec.1 and Dec.15. Delaying sowing date up to Jan.1 decreased
grain yield on the average of the two seasons about (19 %) as compared with sowing
date Dec.15 and about (34%)when Delaying sowing date up to Jan.15. Giza 128
recorded the highest values of plant height, weight of kernels Ispike ,while Giza 127
recorded highest values of number of spikes 1m2 and grain yield.