Annual Research & Review in Biology

Aims: Investigation of responses of different maturity type wheat’s cultivar to planting date.
Study Design: A split-plot arrangement within a randomized complete block design with 4 replication.
Place and Duration of Study: This study was carried out from 2007-2008 in Neyshabur agricultural research station.
Methodology: Theeffect of planting date and maturity type wheat’s cultivar on yield components containing spike number at square meter, spike number per spike, seed number at spikelet, seed number at spike, 1000 seed weight, economic yield and biological yield were assessed. Planting date (11 oct, 15, nov, 30nov) as a main plot andmaturity type wheat’s cultivar (Alamot and Mv17 9(winter type) Toos and Alvand (intermediate type) Marvedasht and Pishtaz (spring type) as sub plot.
Results: The result showed that the number of tillers, number of spike, number of grains spike and biological yield was not affected by the planting date. The maximum and minimum economic yield was obtained on November 30th and October 11th, respectively. Yield components were not affected by maturity type. Wheat cultivar had a different response to planting date. With a delay in planting date, winter type had more of a decrease in economic yield than spring and intermediate types. Decreases of spike number were the main reason for the decreasing of economic yield in the winter type cultivar.
Conclusion: Overall, the most suitable planting date for the winter types was in the middle of October and for spring types in the middle of NovemberIn temperate regions, spring type had more economic yield than the winter and intermediate types.