izadi, E., rashed mohassel, M. (2009). Investigation of Drought Stress and Nitrogen Application Rate on Corn-Redroot Pigweed Competition Using Replacement Series Experiments. , 4(2), 59-67.
ebrahim izadi; mohammad rashed mohassel. "Investigation of Drought Stress and Nitrogen Application Rate on Corn-Redroot Pigweed Competition Using Replacement Series Experiments". , 4, 2, 2009, 59-67.
izadi, E., rashed mohassel, M. (2009). 'Investigation of Drought Stress and Nitrogen Application Rate on Corn-Redroot Pigweed Competition Using Replacement Series Experiments', , 4(2), pp. 59-67.
izadi, E., rashed mohassel, M. Investigation of Drought Stress and Nitrogen Application Rate on Corn-Redroot Pigweed Competition Using Replacement Series Experiments. , 2009; 4(2): 59-67.

Investigation of Drought Stress and Nitrogen Application Rate on Corn-Redroot Pigweed Competition Using Replacement Series Experiments

دانش علف‌های هرز ایران
Article 7, Volume 4, Issue 2, December 2008, Pages 59-67    PDF (245.52 K)
Document Type: Research Article
Authors
ebrahim izadi; mohammad rashed mohassel
Abstract
Water and nitrogen are the most important factors in plant competition. Since of  nitrogen uptake by plants depend on water mass flow, and competition for nitrogen is depend to water availability in soil. In order to study the effect of drought stress and nitrogen application rate on corn-redroot pigweed  interaction,  a factorial experiment was conducted under greenhouse condition based on replacement series method in which different planting ratios of pigweed and maize component of 0:100, 25:75, 50:50, 75:25 and 100:0 pigweed: corn to corn teaseling stage  in 1388 year at Faculty of Agriculture , Ferdowsi University of Mashhad research greenhouse. Treatments included soil water availability in soil at 2 levels (25 and 50 FC) and nitrogen application rate at 3 levels (0, 200 and 400 kg per hectare). Results showed that both corn and pigweed dry mater increased significantly (p≤0.05) with increasing nitrogen application rate in normal soil water condition. It also enhanced corn competitive ability with pigweed. But drought stress decreased both plants dry mater production of both corn and pigweed with nitrogen application. It also had not any advantage for corn yield.
Keywords
drought stress; relative yield; aggressivity index; relative crowding coefficient
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