Determination of suitable planting density in one and two row sowing of open pollination sunflower cultivars in Isfahan

Opportunity of suitable sunflower grain yield depended to profiting of environment and suitable condition preparation for plant in wholl of growth duration and also moderate cultivars selection for secondary planting.In end of 3 years experience (200S-2007)for grain yield improvement of new Russian open pollination sunflower cultivars and also investigation on new and old open pollination cultivars, 2 cultivars named Master and Lakumka had more grain yield than other cultivars.In order to evaluation of suitable planting density in two planting condition (one and two sowing rows in a farrow),this experiment was conducted as spilit spilit plot statistical design with 4 replicates and two years. One and two rows spacing where main plots and plant density (8,10and 12 plants per square meter) and cultivars Master,Lakumka and Hysun 36 where sub plots and sub sub plots respectively. Phenological stages based days number from sowing till ever stage recorded in growth duration and also yield components recorded at phonological ripening on 5 plants of sub plots. Grain yield evaluated on the yield obtained from 5 square meter too. The results of combined analysis from two years experience showed that planting manner (1 and 2 rows) effects was significant in all of phonological stages and plant height in such a plants height was more in 2 rows manner. Planting manner has not affect on yield components except pod diagonal. Grain yield in 2 row spacing with 3746.4 kg/ha was more than 1 row spacing significantly.Increasing of plant density fro 8 to 12 plants per square meter affected on days number till phonological stages and also due to increasing plant height. Pod diagonal decreased in high plant density significantly.The most planting density obtained most grain yield(4076.6 kg/ha)generally.Cultivars Hysun 36 had the longest growth duration and plant height in comparison to others. Yield different between cultivars Master and Hysun 36 was significant.Cultivar Master has the most pod diagonal and at last obtained 3761.4 kg/ha grain yield without significant different to cultivar Lakumka and with significant different to cultivar Hysun 36.0il content in each year only affected by cultivar and the results showed cultivar Master has the highest oil percentage (% 42.23).