Determination of Critical Period of Weed Control in Sunflower (Helianthus annuus cv. Sandra) in Mobarekeh Esfahan Region

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Nazarian Somayeh; YADAVI ALIREZA; MOVAHEDI DEHNAVI MOHSEN; BALOUCHI HAMIDREZA

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Journal: IRANIAN JOURNAL OF WEED SCIENCE Year:2016 | Volume:12 | Issue:1 Page(s): 17-29

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Title

Determination of Critical Period of Weed Control in Sunflower (Helianthus annuus cv. Sandra) in Mobarekeh Esfahan Region

Author(s)

Nazarian Somayeh | YADAVI ALIREZA | MOVAHEDI DEHNAVI MOHSEN | BALOUCHI HAMIDREZA | Issue Writer Certificate

Keywords

Critical periodQ2

interferenceQ3

sunflowerQ2

seed yeildQ2

weed controlQ3

Abstract

In order to determine the Critical period of weed control in sunflower (Helianthus annuus L. cv. Sandra) a field study was conducted in the Mobarakeh region during 2013. The experiment was carried out in a randomized complete blocks design with three replications. Treatments were based on the days after emergence of sunflower in two series. The first series consisted of weed removal, 10, 20, 30, 40, 50 and 60 days after sunflower emergence and then weed maintained until harvest. The second series consisted of weed maintaining till mentioned stages and then weed removal until harvest. Also, two control treatments (weed free and weed infested for all of the growth season) were applied. Results showed that with increasing period of weed interference, grain yield, oil yield, seed number per head and 1000 seed weight decreased significantly. Increasing period of weed control, above characteristics increased significantly. Increasing period of weed interference, weed dry weight significantly increased, but weed density first increased and then decreased. With increasing period of weed control, weed dry weight and density significantly reduced. Considering 10% acceptable grain yield losses, the Critical period of weed control of sunflower was determined to be 12-40 days after emergence (between 4 leaves and flowering stage).

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APA: Copy

Nazarian, Somayeh, YADAVI, ALIREZA, MOVAHEDI DEHNAVI, MOHSEN, & BALOUCHI, HAMIDREZA. (2016). Determination of Critical Period of Weed Control in Sunflower (Helianthus annuus cv. Sandra) in Mobarekeh Esfahan Region. IRANIAN JOURNAL OF WEED SCIENCE, 12(1 ), 17-29. SID. https://sid.ir/paper/185269/en

Vancouver: Copy

Nazarian Somayeh, YADAVI ALIREZA, MOVAHEDI DEHNAVI MOHSEN, BALOUCHI HAMIDREZA. Determination of Critical Period of Weed Control in Sunflower (Helianthus annuus cv. Sandra) in Mobarekeh Esfahan Region. IRANIAN JOURNAL OF WEED SCIENCE[Internet]. 2016;12(1 ):17-29. Available from: https://sid.ir/paper/185269/en

IEEE: Copy

Somayeh Nazarian, ALIREZA YADAVI, MOHSEN MOVAHEDI DEHNAVI, and HAMIDREZA BALOUCHI, “Determination of Critical Period of Weed Control in Sunflower (Helianthus annuus cv. Sandra) in Mobarekeh Esfahan Region,” IRANIAN JOURNAL OF WEED SCIENCE, vol. 12, no. 1 , pp. 17–29, 2016, [Online]. Available: https://sid.ir/paper/185269/en

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