DETERMINATION OF ECONOMIC THRESHOLD AND YIELD LOSSES OF GRAIN CORN (ZEA MAYS L.) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.)

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MIRZAEI REZA; ROSTAMI MAJID; OVEYSI M.; BANAYAN AVAL M.; BAGHESTANI MEYBODI M.A.

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Journal: Applied Entomology and Phytopathology Year:2005 | Volume:73 | Issue:1 Page(s): 1-12

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Title

DETERMINATION OF ECONOMIC THRESHOLD AND YIELD LOSSES OF GRAIN CORN (ZEA MAYS L.) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.)

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Keywords

REDROOT PIGWEED (AMARANTHUS RETROFLEXUS)Q2

CORN (ZEA MAYS)Q3

COMPETITIONQ3

ECONOMIC THRESHOLDQ3

Abstract

In order to study yield loss percentage and weed threshold density in grain corn, an experiment was conducted in 2002 at the Agricultural College, Ferdowsi University of Mashhad using a factorial arrangement of treatment, using additive series in a randomized complete block design. Two factors were involved in the experiment, redroot pigweed density in five levels (0, 2, 4, 6 and 12 plantm-2) and corn density in three levels (7, 9 and 11 plantm-2). Two parameters hyperbolic model was fitted to seed yield loss of corn. Minimum seed yield loss percentages were 6.54, 4.35 and 4.1 at 7, 9 and 11 plantm-2 corn density, respectively. Minimum seed yield loss decreased by 37% when corn density increased from 7 to 11 plantm-2. Maximum seed yield loss was 50.43, 34.16 and 24.6% at 7, 9 and 11plant m-2 corn densities, respectively. When corn density increased from 7 to 11 plantm-2 maximum seed yield loss decreased by 51%. Increasing corn density caused the increment at weed threshold density, so that it increased by 35% and reached from 0.13 to 0.2 plantm-2. Also increasing corn density caused the increment at weed ECONOMIC THRESHOLD density from 1.5 to 2.8 plantm-2. Generally, density had a significant effect on COMPETITION between redroot pigweed and corn and threshold density, and increment of corn density increased corn competitive ability and reduced damage of redroot pigweed.

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APA: Copy

MIRZAEI, REZA, ROSTAMI, MAJID, OVEYSI, M., BANAYAN AVAL, M., & BAGHESTANI MEYBODI, M.A.. (2005). DETERMINATION OF ECONOMIC THRESHOLD AND YIELD LOSSES OF GRAIN CORN (ZEA MAYS L.) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.). APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY, 73(1), 1-12. SID. https://sid.ir/paper/13125/en

Vancouver: Copy

MIRZAEI REZA, ROSTAMI MAJID, OVEYSI M., BANAYAN AVAL M., BAGHESTANI MEYBODI M.A.. DETERMINATION OF ECONOMIC THRESHOLD AND YIELD LOSSES OF GRAIN CORN (ZEA MAYS L.) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.). APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY[Internet]. 2005;73(1):1-12. Available from: https://sid.ir/paper/13125/en

IEEE: Copy

REZA MIRZAEI, MAJID ROSTAMI, M. OVEYSI, M. BANAYAN AVAL, and M.A. BAGHESTANI MEYBODI, “DETERMINATION OF ECONOMIC THRESHOLD AND YIELD LOSSES OF GRAIN CORN (ZEA MAYS L.) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.),” APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY, vol. 73, no. 1, pp. 1–12, 2005, [Online]. Available: https://sid.ir/paper/13125/en

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