Effect of plant density on physiological characteristics of growth and yield of varieties of dry farming wheat in Lorestan province

In order to study the effect of densities different sowing on physiological characteristics of growth four varieties of dry farming wheat, the experiment was conducted in split plot design in randomized complete block design (RCBD) with four replication in cropping year 2009-2010 in Research Station of Agricultural and Natural Resources of Boroujerd. In this experiment, sowing densities in four levels as main plots at four Levels 250, 300, 350 and 400 seed in square meter and the varieties in four Levels (Azar-2, sardary, rasad and pato) also be considered as sub - plots. Grain yield, plant yield, biological yield, spike length, height of plant before heading, height of plant in harvest stage, number of spike in plant, number of sterile tiller, number of grain in spike, thousand grain weight, number of spike in the area unit and harvest index were measured.The results of the analysis of variance showed that among the varieties existed significance difference according to studied characteristics. Except biological yield, thousand grain weight, and harvest index, the effect of density on all characteristics were significant. The interactions of variety density for characteristics of number of spike in plant and grain yield was significant. Except height of plant in harvest, the simple correlation of grain yield with other characteristics was positive. The number of grain in spike has the highest correlation with the yield in probability level %1 r: 0.847. The most yield was related to the pato variety with average yield of 2972.2 kg/ha and the densities between 300 to 350 of seeds in square meter.