EFFECT OF RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) IN VARIOUS DENSITIES AND EMERGENCE TIMES ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (HELIANTHUS ANNUS L.)

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SIAMI K.; YAGHOUBI S.R.; FARAMARZI A.; JAVADI M.

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Journal Paper

Paper Information

Journal: AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE) Year:2008 | Volume:4 | Issue:12 Page(s): 49-61

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Title

EFFECT OF RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) IN VARIOUS DENSITIES AND EMERGENCE TIMES ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (HELIANTHUS ANNUS L.)

Author(s)

SIAMI K. | YAGHOUBI S.R. | FARAMARZI A. | JAVADI M. | Issue Writer Certificate

Keywords

REDROOT PIGWEEDQ3

SUNFLOWERQ2

DENSITYQ2

TIME OF EMERGENCEQ3

COMPETITIONQ2

YIELDQ2

YIELD COMPONENTSQ2

Abstract

Influence of REDROOT PIGWEED in various densities and emergence times on SUNFLOWER YIELD was studied in Miyaneh region of Iran in 2007. The experiment was carried out as randomized complete block design in a factorial arrangement of three pigweed DENSITY (1.5, 3 and 6 plants m-1 of row) and five TIME OF EMERGENCE (emergence with SUNFLOWER, 2, 4, 6 and 8 weeks after SUNFLOWER emergence) in three replications. The effect of weed DENSITY and TIME OF EMERGENCE on SUNFLOWER YIELD, YIELD component and head diameter were analyzed and described by rectangular hyperbola model. Results revealed that seed number per head, seed thousand weight, and head diameter and seed YIELD significantly decreased with increasing weed DENSITY and earlier pigweed emergence. Pigweed emerging up to six weeks later than SUNFLOWER did not cause any significant reduction in SUNFLOWER seed YIELD, but even at this time, increased pigweed DENSITY reduced the YIELD.

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APA: Copy

SIAMI, K., YAGHOUBI, S.R., FARAMARZI, A., & JAVADI, M.. (2008). EFFECT OF RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) IN VARIOUS DENSITIES AND EMERGENCE TIMES ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (HELIANTHUS ANNUS L.). AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE), 4(12), 49-61. SID. https://sid.ir/paper/166820/en

Vancouver: Copy

SIAMI K., YAGHOUBI S.R., FARAMARZI A., JAVADI M.. EFFECT OF RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) IN VARIOUS DENSITIES AND EMERGENCE TIMES ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (HELIANTHUS ANNUS L.). AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE)[Internet]. 2008;4(12):49-61. Available from: https://sid.ir/paper/166820/en

IEEE: Copy

K. SIAMI, S.R. YAGHOUBI, A. FARAMARZI, and M. JAVADI, “EFFECT OF RED ROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) IN VARIOUS DENSITIES AND EMERGENCE TIMES ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (HELIANTHUS ANNUS L.),” AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE), vol. 4, no. 12, pp. 49–61, 2008, [Online]. Available: https://sid.ir/paper/166820/en

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