اثر رقابت علف هرز چاودار بر شاخص هاي رشد ، عملكرد و اجزاي عملكرد گندم

Competitive effects of rye (Secale cereale L.) on growth indices, yield and yield components of wheat

In order to evaluate effect of rye competition on wheat, an experiment was conducted in Varamin Agricultural Research Center in 2000-2001. The experimental design was complete randomized block in factorial arrangement with three replications. The treatments included wheat density at four densities (350,450, 550 and 650 plant/m2), and rye density at five levels (0, 10, 30, 50, and 70 plant/m2). In order to analyze wheat growth, samples was taken from tillering to harvest stages. Leaf area index (LAI), total dry matter accumulation (TDM), and crop growth rate (CGR) of wheat were affected by rye densities. Grain yield of wheat and number of spike per square meter were significantly decreased by increasing rye density. The biological yield of wheat was linearly affected by rye densities at plant density of wheat more than 450 plant/m2. In the wheat fields infested by rye, wheat plant density of 450 plant/m2 can be recommended, due to reduce of wheat yield is a good density for reducing rye damage in wheat.