Mirzaei, R., Rostami, M., Ovaysi, M., Banayan Aval, M., Bagestani, M. (2005). Determination of economic threshold and yield losses of grain corn (Zea mays L.) in competition with redroot pigweed (Amaranthus retroflexus L.). , 73(No. 1), 1-12.
R. Mirzaei; M. Rostami; M. Ovaysi; M. Banayan Aval; M. Bagestani. "Determination of economic threshold and yield losses of grain corn (Zea mays L.) in competition with redroot pigweed (Amaranthus retroflexus L.)". , 73, No. 1, 2005, 1-12.
Mirzaei, R., Rostami, M., Ovaysi, M., Banayan Aval, M., Bagestani, M. (2005). 'Determination of economic threshold and yield losses of grain corn (Zea mays L.) in competition with redroot pigweed (Amaranthus retroflexus L.)', , 73(No. 1), pp. 1-12.
Mirzaei, R., Rostami, M., Ovaysi, M., Banayan Aval, M., Bagestani, M. Determination of economic threshold and yield losses of grain corn (Zea mays L.) in competition with redroot pigweed (Amaranthus retroflexus L.). , 2005; 73(No. 1): 1-12.

Determination of economic threshold and yield losses of grain corn (Zea mays L.) in competition with redroot pigweed (Amaranthus retroflexus L.)

آفات و بیماری‌ های گیاهی
Volume 73, No. 1 - Serial Number 79, September 2005, Pages 1-12    PDF (133.87 K)
Authors
R. Mirzaei; M. Rostami; M. Ovaysi; M. Banayan Aval; M. Bagestani
Abstract
In order to study yield loss percentage and weed threshold density in grain corn, an experiment was conducted in 2002 at the AgriculturalCollege, Ferdowsi University of Mashhad using a factorial arrangement of treatments 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 plant.m-2) and corn density in three levels (7, 9 and 11
plant.m-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 plant.m-2 corn density, respectively. Minimum seed yield loss decreased by 37% when corn density increased from 7 to 11 plant.m-2. Maximum seed yield loss was 50.43, 34.16 and 24.6% at 7, 9 and 11 plant.m-2­ corn densities, respectively. When corn density increased from 7 to 11 plant.m-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 plant.m-2. Also increasing corn density caused the increment at weed economic threshold density from 1.5 to 2.8 plant.m-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.
Keywords
redroot pigweed (Amaranthus retroflexus); corn (Zea mays); competition; economic threshold
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