effects of planting date, plant density and planting pattern on yield of corn (zea mays l) in beiranshahr region

to study the effect of planting date, plant density and planting pattern on yield of corn (zea mays l) var. ksc 647 split plot factorial experiment in a randomized complete block design with four replications at bayranshahr lorestan province in crop year 2015 was conducted. factors examined included planting date in three levels: (25 may, 12 june and 29 june), density at three levels (60, 75 and 85 thousand plants per hectare) and planting a row and double row. the results of this study showed that planting date and plant density on grain yield were significant. the effect of sowing dates and planting pattern had no significant effect on grain yield. the highest grain yield (kg ha 14/653) at a density of 85 thousand plants per hectare, respectively. interactions between treatments was significant on grain yield. means comparison showed that grain yield, treatment interaction effect of sowing date, density and planting pattern significant superiority compared to other treatments.