The effect of cultivars and planting date on yield and yield components of maize in the tropical region of Kermanshah (Sarpool-Zahab)

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The project aims to increase corn yield by two separate experiments on late and medium maturity hybrids corn were done at three planting date. The projects were conducted split plot in a randomized complete block design in the second crop at the region of Sarpool-Zahab. The measured parameters include number of days to silking and physiological maturity, number of kernels per row, number of rows per ear, cob percent, grain moisture and grain yield. Analysis of variance showed that the effect of both groups were non-significant for the yield and yield component traits. Effect of planting date was a significant in most traits. Interaction between varieties and planting date were not significant on all traits. Maximum yield belonged to KSC647 and KSC604 × second planting date with 10.91 and 9.51 Ton ha-1, respectively.  Maximum yield belonged to KSC711 and KSC704 × second planting date with 10.63 and 10.13 ton ha-1, respectively. In the second sowing date, effect of temperature stress was very low on field corn. The emergence of reproductive organs and inoculation were very good and Kernel formation on the cob of corn was completely. Corn grain yield in both groups, increase on the second planting date than the other planting with 46.2 and 39 percent, respectively

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