مقایسه عملکرد ارقام ذرت در کشت تابستانه پس از برداشت محصولات پاییزه

In order to study the effect of various fall crops on the morphological traits, yield and yield components of seed corn, an experiment was done in the reaserch field of Sarabe Changay located in Khoramabad at - . RCBD as split-plot was used with four repetitions. The fall crop factor included wheat, barley , clover, annual alfalfa and canola in main plots and after harvesting them three corn varieties (SC , SC and SC ) were sown as sub plot in summer. Location of main- and sub plots was fixed during three years of experiment. The result showed that the fall crops factor had a Significant effect ( ) on biological yield, harvest index, grain yield and yield components (exept of row ear- ). Corn fallowing canola produced the highest biological yield in first year of experiment, which was not significantly different from corn fallowing clover and annual alfalfa; biological yield of corn fallowing clover and annual alfalfa had an increasing trend in second and third years. Corn grain yield fallowing clover, canola and annual alfalfa due to higher growth-induced fertile soil was higher than corn grain yield fallowing wheat and then barley due to compact and low fertile soil and allelopaty effect yearly. Complete analysis of variance showed that corn grain yield as summer plantig fallowing clover, canola, annual alfalfa, wheat and barley trend was , , , and ton ha- , respectively, but differences between canola with annual alfalfa and wheat with barley were not significant. Higher -grain weight, grain row- and grain ear- caused increasing grain yield. Effect of variety showed that longer maturity SC grain yield of ton ha- was better than other two varieties due to higher grain row- , grain ear- and harvest index. Key words : Seed corn, Fall crops, Grain yield.