Evaluation of Castor bean (Ricinus communis L. ) competition with redroot pigweed (Amaranthus retroflxus L. ) at different levels of plant densities

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JAFARZADEH N.; PIRZAD A.; HADI H.

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Journal: PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH) Year:2017 | Volume:9 | Issue:30 Page(s): 142-154

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Title

Evaluation of Castor bean (Ricinus communis L. ) competition with redroot pigweed (Amaranthus retroflxus L. ) at different levels of plant densities

Author(s)

JAFARZADEH N. | PIRZAD A. | HADI H. | Issue Writer Certificate

Keywords

Dry matterQ1

plant heightQ2

lateral branchesQ1

leaf area indexQ2

oil yieldQ2

Abstract

In order to evaluate the competitive effect of castor bean with redroot pigweed at different levels of plant densities, a factorial experiment based on randomized complete blocks design was conducted in three replications in Agricultural Research of West Azarbayjan in Urmia in 2011. The first factor was different densities of castor bean in five levels 0 (pure stand of pigweed), 3, 4, 5 and 6 plant. m-² , and the second factor was three levels of redroot pigweed 0 (pure stand of castor), 5, 10 and 15 plant. m-² . Results showed that with increasing pigweed density, castor bean grain yield (20-38%), oil percent (39%), and plant height (32%) decreased compare to pure culture. The maximum amount of leaf dry weight (58. 7g. m-2), stem dry weight (49. 3g. m-2), number of branches (5. 3), and plant height (44. 9cm) belonged to pure stand of pigweed, that decreased by increasing castor bean density. With increasing pigweed density, leaf area index in pure culture reached to the highest level (1. 44) which was 50% higher than 15 plant/m2 of pigweed, and 6 plant. m-² of castor bean. The highest (157cm) and the lowest (107 cm) plant height of castor bean attained at 6 and 3 plants per m2, respectively. Therefore increasing in pigweed density decreased grain yield and oil yield. The amount of this reduction was related to pigweed density.

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APA: Copy

JAFARZADEH, N., PIRZAD, A., & HADI, H.. (2017). Evaluation of Castor bean (Ricinus communis L. ) competition with redroot pigweed (Amaranthus retroflxus L. ) at different levels of plant densities. PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH), 9(30 ), 142-154. SID. https://sid.ir/paper/188571/en

Vancouver: Copy

JAFARZADEH N., PIRZAD A., HADI H.. Evaluation of Castor bean (Ricinus communis L. ) competition with redroot pigweed (Amaranthus retroflxus L. ) at different levels of plant densities. PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)[Internet]. 2017;9(30 ):142-154. Available from: https://sid.ir/paper/188571/en

IEEE: Copy

N. JAFARZADEH, A. PIRZAD, and H. HADI, “Evaluation of Castor bean (Ricinus communis L. ) competition with redroot pigweed (Amaranthus retroflxus L. ) at different levels of plant densities,” PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH), vol. 9, no. 30 , pp. 142–154, 2017, [Online]. Available: https://sid.ir/paper/188571/en

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