EFFECT OF DIFFERENT DENSITIES AND EMERGENCE TIMES OF REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) ON COMPETITIVE ABILITY OF SUNFLOWER (HELIANTHUS ANNUS L.) HYBRIDS

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MIRSHEKARI B.

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Journal: CROP PRODUCTION IN ENVIRONMENTAL STRESS Year:2011 | Volume:2 | Issue:3-4 (SERIAL 5) Page(s): 89-104

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Title

EFFECT OF DIFFERENT DENSITIES AND EMERGENCE TIMES OF REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) ON COMPETITIVE ABILITY OF SUNFLOWER (HELIANTHUS ANNUS L.) HYBRIDS

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MIRSHEKARI B. | Issue Writer Certificate

Keywords

DENSITYQ2

LEAF APPEARANCE RATEQ3

REDROOT PIGWEEDQ2

RELATIVE TIME OF EMERGENCEQ3

SUNFLOWERQ2

Abstract

In order to study of compatibility of three SUNFLOWER hybrids at interference with different densities and emergence times of REDROOT PIGWEED (Amaranthus retroflexus L.), two field experiments were carried out during 2005 and 2006. Factorial experiments were established on Randomized Complete Block Design with three replications. Three factors included three different weed densities (8.3, 25 and 41.7 plants m-2), three relative times of weed emergence (emerged with SUNFLOWER; 15 and 30 days after SUNFLOWER emergence) and three different SUNFLOWER cultivars (Azarghol, Hysun 33 and Allstar RM). Three weedfree SUNFLOWER cultivars as controls were seeded. Results indicated that LEAF APPEARANCE RATE and phyllochrone in SUNFLOWER from fifth leaf to later in treatments of weed emerging with SUNFLOWER at densities of 25 and 41.7 plants m-2 in Hysun and Allstar hybrids decreased. Time to anthodium appearance in treatments of full season interference of 25 and 41.7 weeds m-2 increased up to 15% and 16% in Hysun, and 38% and 47% in Allstar hybrids, respectively, compared with control. In Hysun and Allstar, weed emergence time was more effective than weed DENSITY on time to flowering of SUNFLOWER. In Azarghol, only third level of weed DENSITY could decrease stem height of SUNFLOWER, and this kind of effect was removed from 75 days after SUNFLOWER emergence. Improvement of SUNFLOWER hybrids with high stem height will increase that's competitive power with REDROOT PIGWEED and other troublesome weeds, and we can use from that for integrated weed management.

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APA: Copy

MIRSHEKARI, B.. (2011). EFFECT OF DIFFERENT DENSITIES AND EMERGENCE TIMES OF REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) ON COMPETITIVE ABILITY OF SUNFLOWER (HELIANTHUS ANNUS L.) HYBRIDS. CROP PRODUCTION IN ENVIRONMENTAL STRESS, 2(3-4 (SERIAL 5)), 89-104. SID. https://sid.ir/paper/232060/en

Vancouver: Copy

MIRSHEKARI B.. EFFECT OF DIFFERENT DENSITIES AND EMERGENCE TIMES OF REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) ON COMPETITIVE ABILITY OF SUNFLOWER (HELIANTHUS ANNUS L.) HYBRIDS. CROP PRODUCTION IN ENVIRONMENTAL STRESS[Internet]. 2011;2(3-4 (SERIAL 5)):89-104. Available from: https://sid.ir/paper/232060/en

IEEE: Copy

B. MIRSHEKARI, “EFFECT OF DIFFERENT DENSITIES AND EMERGENCE TIMES OF REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.) ON COMPETITIVE ABILITY OF SUNFLOWER (HELIANTHUS ANNUS L.) HYBRIDS,” CROP PRODUCTION IN ENVIRONMENTAL STRESS, vol. 2, no. 3-4 (SERIAL 5), pp. 89–104, 2011, [Online]. Available: https://sid.ir/paper/232060/en

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