Effect of Weed /Crop Interference on Weed Canopy Architecture and Spring Barley Yield as Affected by Application of Ehemical Fertilizers

Document Type : Research Paper

Authors

1 Assistants Propessor, Department of Agronomy and Plant Breeding, University of Mohaghegh Ardabili- Ardabil

2 Propessor, Department of Agronomy and Experimental Methods, Agricultural University of Timiriazev, Moscow

Abstract

In order to determine effect of weed /crop interference on weed canopy architecture and spring barley yield as affected by long-term chemical fertilizers, an experiment was conducted in long-term site Agricultural University of Timiriazev, Moscow, during 2004 and 2005. The treatments were N, P, K and NPK application and control (without fertilizer). Analysis shown in plots that received N, P, and K alone that weed density was similar or higher than control. The combination of fertilizers (NPK) decreased weed density 2 times. Nitrogen application alone had increased weed dry mass at the top third canopy layer. In this plots weed cover was 67%, while in rest it was lower than 22%. Dominant weed speciesincluded wild radish (Raphanus raphanistrum L.), wild chamomile (Matricaria inodora L.) and corn spurry (Spergula arvensis L.). In plots that N had applied alone dominant weed speciesincluded wild radish and corn spurry, while wild chamomile was dominated where K was applied. The combination of fertilizers had increased spring barley yield.

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