مطالعه اثر تراکمهای متفاوت بوته بر خصوصیات زراعی فیزیولوژیکی ژنوتیپهای مختلف یولاف زراعی در اهواز

To study the effect of differen plant densities on agronomic and physiological characteristics of five genotypes of oat during 2013-2014 growing season as field experiment at research field of Agronomy and Plant Breeding Department of Shahid Chamran University of Ahvaz. Experimental design was factorial based on RCB with three replications. Two factors were studied in this experiment. The first factor was five oat genotypes included V1, V2, V3, V4 and V5, and second factor was different plant densities of 300, 400 and 500 plant in per m2. . The results showed that the genotype V4 highest level of forage yield, dry matter yield, LAI and chlorophyll content in the dough stage.
Probably with increasing plant density, green cover percentage increased, and with increased absorption of solar radiation, the yield per unit area increases. Also, with increased rates of photosynthesis, , dry matter production is increasing. Probably not enough space for the expanding lamina and shading the plants on each other and creat a narrow leaves of high density, reason of decrease in LAI at high densities. With density increases, flag leaf chlorophyll content increased for use maximum light, due to increased shading of leaves on each other.