Study the effect of some different Environmental factors on dispersal of dominant broadleaf weeds in irrigated wheat fields.
Subject Areas : Weed Research Journal
Omid
Lotfifar
1
(Agriculture department. Pay am no or university. Tehran. Iran'.)
سمانه
متقی
2
(استادیار دانشگاه پیام نور، تهران)
hamid
Mostafavi
3
(Department of Agronomy and Plant Breeding, Karaj Branch, Islamic Azad University, Karaj, Iran)
Seyed Mehdi
Mirtaheri
4
(Department of Agronomy and Plant Breeding, Karaj Branch, Islamic Azad University, Karaj, Iran)
Keywords: Irrigated wheat, Environmental factors, Rainfall and Weed, climate,
Abstract :
This research was conducted to study the 7 common broadleaves dispersal of irrigated wheat fields in response to some environmental factors. Research data were obtained from sampling of weed communities and using weed dispersal maps (produced by GIS). The effects of environmental factors (climates, soil order and annual mean of soil temperature, rainfall and evaporation) on dispersal of dominant weed were studied. Result showed the effect of studied factors on each weed dispersal was different. The highest dispersal of Descurainia sophia was observed in semiarid climate, 250-500mm rainfall, 0-6°C soil temperature, 3500-4000 mm evaporation, eridisols soil and 1600-1800 m elevation. The highest Galium tricornatum dispersal was observed in wet climate, 1000-1250 mm rainfall, 6-12°C soil temperature, 1500-2000 mm evaporation, inceptisol soil and 1800-2000 m elevation. Cardaria draba in wet climate, 50-250 mm rainfall, 0-6°C soil temperature, 1500-2000 mm evaporation, aridisol soil and 2600-2800 m elevation had highest dispersal. The highest dispersal of Polygonum aviculare was observed in sever-arid soil, 50-250 rainfall, 12-18°C soil temperature, 2000-2500mm evaporation, aridisol soil and 2400-2600m elevation. Alhagi psudalhagi in arid soil, 50-250mm rainfall, 18-24°C soil temperature, 2000-2500mm evaporation, aridisol soil and 1000-1200m elevation had the highest dispersal. The highest dispersal of Carthamus oxycantha was observed in 50-250mm rainfall, 6-30°C soil temperature, 2500-3000mm rainfall, entisol soil and 200-400m elevation. Also the highest Convovulus arvensis dispersal was observed in moderate semiarid climate, 250-500mm rainfall, 6-12°C soil temperature, 1000-4000mm evaporation, inseptisol soil and 2600-2800m elevation.
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