Effect of planting date and plant density on yield and yield components of rice

摘要

In order to detennine the best date of planting and plant density on rice yield of Fajr genotype an experiment was carried out at split plot in Randomized Completely Block Design with four replication in 2009, the dates of planting in 3 levels (May 30th, June 9th and June 19th) as main factors and 4 levels of plant density (17, 34, 51 and 68 plant/m~2), sub-factors were considered. The obtained results showed that the increase of plant density increased the yield, so that the highest yield was related to the density, of 68 plant/m~2. With the delay of planting the yield of rice decreased in level unit. The highest yield was related to the times of may 30th and June 9th. The interaction effect of planting date of Fajr genotype rice yield is really significant so that the highest yield related to the density of 34 plant/m~2 and planting date of June 9th and the least yield of grain obtained in plant density 17, 34 and 51 plant/m~2 in planting date of June 19th. Tiller number in each square meter considered as the most important and effective component yield that had a high and positive relation with yield grain.