the effect of water logging stress at filling stage on yield and yield components of wheat (triticum aistivum)

water logging stress is one of the most important factors which affect wheat production particularly in western regions of golestan province. this experiment was carried out in order to evaluate of six genotypes (n-81-18, arta, moghan, n-80-19, urwyt-82-11 and urwyt-82-17) of bread wheat in water logging condition at 2006-2007 growing season in gorgan agricultural research station. the experimental design was strip- plot whit five replications. the common traits such as biological yield, grain yield, harvest index, plant height, length of peduncle, and spike no per m2, length of spike, spike weight, no spike let per spike, no of grain per spike, and grain weight were measured. results of anova in two conditions (with water logging stress and with out water logging stress) showed all traits have significant different (p