Document Type : Research Paper

Authors

1 Agronomy Department, Faculty of Agriculture, Azad Islamic University of Takestan

2 PhD student in Agriculture, Crop Ecology, Islamic Azad University, Takestan Branch

3 Professor, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

4 Assistant Professor and Faculty Member of Islamic Azad University, Takestan branch

5 faculty member of Takestan University, Faculty of Agricultural Sciences

Abstract

In order to evaluate the planting date delay on phenological traits, yield components, grain yield and linoleic and linolenic fatty acids of new sunflower hybrids, an experiment as split plot in a randomized, completely block design, with four replicates at the field of oilseed section of seed and plant Improvement during 2014-2016 growing season. The treatments include seven sunflower hybrids (Barzegar, Farrokh, Haysan 36, Qasem, Shams, Azargol and Haysan 25) on three planting dates (15 days after harvest of autumn (wheat), July 1, July 15 and July 30, respectively) was evaluated. The experimental results showed significant effects of planting date on all traits except number of seeds per head and linolenic acid at the level of 1% and on the percentage of oil and linoleic acid at the level of 5%. The studied hybrids were significantly different in all traits except linoleic and linolenic fatty acids. The latest experimental hybrids included Barzegar and Azargol hybrids and the earliest hybrid was Farrokh. The highest grain yield was obtained from the date of the first sowing at the rate of 2840 kg / ha and in the case of delayed sowing the yield was reduced to 41%.

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