Effect of sowing date and plant density on yield and yield components of Cow Pea (Vigna sinensis L.) in Ahwaz

Sowing date and plant density are important factors in grain yield of cow pea. Inorder to study effect of sowing date and plant density on yield and yieldcomponents of cow pea, an experiment was conducted in research farm of RaminUniversity of Agricultural and Natural Resources in 2008. The experimental designwas split plots in randomized complete design with four replications. Theexperimental factors were sowing date (7 Jun., 22 Jun., 7 Jul. and 22 Jul.) in mainplots and inter row spacing (10, 15, 20 and 25 cm) in sub plots. The results showedthat sowing date had significant effect on all of traits, in the other hands, inter rowspacing had significant effect on number of pods in plant, number of grains in podand grain yield, but had not significant effect on 1000 grain weight and harvestindex. Interaction effect of sowing date and inter row spacing was significant onlyfor grain yield. Also, comparison of means showed that with delay in sowing dateand increase of inter row spacing, decreased the grain yield.