محمد شریفی الحسینی

In order to determine the effects of planting date on the grain yield of four cultivars of wheat, a statistical split-plot design with four replications was used over a period of three years (1993-1995) at the experimental station of Birjand. In this experiment four planting dates (Sep. 22, Oct.6, Oct. 21, Nov. 6) were considered the main plots and four wheat cultivars (Ghods, Falat, No. 11, and Hirmand) were placed in the sub plots. The results showed that the best planting date was 7 th Sep. to 21 th Oct. For all cultivars. The falat variety had the lowest yield when the date of planting was 22th Sep. The No. 11 cultivar had the highest susceptibility to date of planting and its yield decteased considerably in early planting dates.

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