The effect of plant density on seed yield and yield components in modern and old wheat cultivars

Plant density can be as a supplementary section in the increase of the yield of Wheat products. in order to research the effect of density on the yield and yield components in Wheat, an experiment was conducted in the agricultural research farm located in Araghi Mahalleh, Gorgan city using three density levels (150, 262, 375 plant in square meter) and three cultivars of Wheat (Tajan, Falat, N-81-18) during 2007-8. The experimental design was a randomized complete block, with 4 replications in factorial arrangement. The findings indicated that the increase of density resulted in the decrease of the number of fertile tillers, the number of seeds in main ear and the increase of seed yield, biological yield and harvest index. The maximum amount of seed yield, biological yield and harvest index for the cultivar of N-81-18 was gained that was introduced as a new cultivar in the region. The cultivar of Tajan had the highest rate of weight for one thousand seeds and the highest length of ear that ear been as old under the cultivation in the region.