Study of effects of cultivar, weeds and plant density on yield and yield components of sweet corn under Iranian warm environment

The objective of the study was to determine important agronomic traits of sweet corn hybrids under weeds fully controlled and not-controlled conditions at different plant densities. The study was carried out in Hajiabad, Hormozgan, Iran in 2006. It was a split-split plot design based on a randomized complete block design with four replications. The main plots included sweet corn hybrids, namely KSC403 and Shimmer, the sub-plots included two levels, namely weeds fully controlled and not-controlled conditions, and the sub-sub-plots included three densities of 53000, 67000 and 89000 plants/ha. The results of analysis of variance showed that the variations of Shimmer and KSC403 in grain yield, 100-grain weight, grain number/row and row number/ear were significant. Also, weeds full control increased the grain yield by 7.8%. The highest grain yield was 9700 kg/ha for Shimmer at the density of 89000 plants/ha under weeds fully controlled conditions. In total, Shimmer exhibited superior traits over KSC403. In addition, Shimmer produced the highest grain yield at the density of 89000 plants/ha under weeds fully controlled conditions.