EFFECT OF DIFFERENT WEEDS COMPETITION PERIODS ON THE YIELD OF SUNFLOWER, CV. ALLSTAR

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MIRSHEKARI B.; HOSSEIN ZADEH MOGHBELI A.H.; SHAHROKHI KHANEGHAH SH.

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Journal: JOURNAL OF RESEARCH IN CROP SCIENCES Year:2009 | Volume:2 | Issue:2 Page(s): 35-44

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Title

EFFECT OF DIFFERENT WEEDS COMPETITION PERIODS ON THE YIELD OF SUNFLOWER, CV. ALLSTAR

Author(s)

MIRSHEKARI B. | HOSSEIN ZADEH MOGHBELI A.H. | SHAHROKHI KHANEGHAH SH. | Issue Writer Certificate

Keywords

ALLSTARQ3

FULL SEASON COMPETITIONQ2

LEAF AREA INDEXQ2

WEED MANAGEMENTQ2

Abstract

In order to study the effect of different weed competition periods on sunflower yield, cv. ALLSTAR, an experiment was conducted in Islamic Azad University of Tabriz, Iran, during 2007 based on randomized complete block design with three replications. The first five treatments were the presence of weeds in the first 2, 4, 6, 8, 10 weeks and their subsequent control during the remaining growth season. The sixth treatment included the preservation of weeds in the whole growth period. The seventh treatment was chosen as a control and the weeds, in the whole period of growth, came under the control. Dominant weeds in experiments were redroot pigweed (Amaranthus retroflexus L.), lambsquarters (Chenopodium album L.), bermuda grass (Cynodon dactylon L.) and small bindweed (Convolvulus arvensis L.). Results showed that the effects of treatments on LEAF AREA INDEX (LAI), anthodium diameter, grain number per anthodium, hollow seed percentage, hundred seeds weight, seed grain yield and seed oil yield were significant. Reduction value in LAI was calculated 54%, when weeds competition with sunflower extended along it' s growth period. Simultaneous growth of weeds and sunflower for more than 8 weeks could reduce grain number per anthodium, significantly. Grain yield of sunflower in full season weeds interference reduced to 27.5%, compared with control. With attention to oil yield reduction of sunflower from 29%, when weed control delayed until 4 weeks after sunflower emergence, to 43% in FULL SEASON COMPETITION of weeds in present weed densities, weed control is recommended, when they grow simultaneously with sunflower more than 2 weeks after sunflower emergence.

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APA: Copy

MIRSHEKARI, B., HOSSEIN ZADEH MOGHBELI, A.H., & SHAHROKHI KHANEGHAH, SH.. (2009). EFFECT OF DIFFERENT WEEDS COMPETITION PERIODS ON THE YIELD OF SUNFLOWER, CV. ALLSTAR. JOURNAL OF RESEARCH IN CROP SCIENCES, 2(2), 35-44. SID. https://sid.ir/paper/168052/en

Vancouver: Copy

MIRSHEKARI B., HOSSEIN ZADEH MOGHBELI A.H., SHAHROKHI KHANEGHAH SH.. EFFECT OF DIFFERENT WEEDS COMPETITION PERIODS ON THE YIELD OF SUNFLOWER, CV. ALLSTAR. JOURNAL OF RESEARCH IN CROP SCIENCES[Internet]. 2009;2(2):35-44. Available from: https://sid.ir/paper/168052/en

IEEE: Copy

B. MIRSHEKARI, A.H. HOSSEIN ZADEH MOGHBELI, and SH. SHAHROKHI KHANEGHAH, “EFFECT OF DIFFERENT WEEDS COMPETITION PERIODS ON THE YIELD OF SUNFLOWER, CV. ALLSTAR,” JOURNAL OF RESEARCH IN CROP SCIENCES, vol. 2, no. 2, pp. 35–44, 2009, [Online]. Available: https://sid.ir/paper/168052/en

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