Abstract
In order to examine the effect of sowing date and seeding level on yield and yield components of cumin, a factorial experiment was conducted in 2009-2010 based on a randomized complete block design with three replications. The main plot was sowing date at four levels (December 9, January 8, February 7 and March 9) and the sub-plot was seeding level at three levels (15, 30 and 45 kg/ha) The results showed that sowing date significantly affected 1000-seed weight, seed and biological yields, seed and biomass yields of single plant at 1% probability level. Also, seeding level significantly affected biological yield and seed and biomass yields of single plant at 1% probability level and seed yield and harvest index at 5% probability level. The interaction between sowing date and seeding level significantly affected seed yield, 1000-seed weight, harvest index and seed and biomass yields of single plant. Means comparison showed that the delay in sowing from January 8 to March 9 decreased seed and biological yields by 59.04 and 63.01%, respectively. In addition, the delay in sowing from January 8 to February 7 and March 9 significantly decreased seed yield of single plant by 50.7 and 70.7%, respectively. According to the results, as seeding level was increased from 15 to 45 kg/ha, seed yield, decreased by 4%, but biological yield increased by 13.28%. Given the results, it can be recommended to use sowing date of January 8 with the seeding level of 15-30 kg/ha for the cultivation of cumin in Birjand, Iran.
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