Effects of deficit irrigation on the yield, yield components, water and irrigation water use efficiency of spring canola

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Research Paper 01/08/2014
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Effects of deficit irrigation on the yield, yield components, water and irrigation water use efficiency of spring canola

Abolfazl Majnooni-Heris, Amir Hossein Nazemi, Ali Ashraf Sadraddini
J. Bio. Env. Sci.5( 2), 44-53, August 2014.
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Rapeseed is the third most important edible oil source after soybean and palm in the world and is the most widely cultivated oilseed crop in Iran. Because of oil and many other usages of rapeseed this experiment was conducted to evaluate the effects of water stress on yield and yield components, total biomass, evapotranspiration, yield response factor to water stress, water use efficiency (WUE) and irrigation water use efficiency (IWUE) of spring canola (Brassica napus L.) in Agricultural Research Station of Tabriz University, Iran. Spring type of canola was planted in furrows and irrigated during the growing season. In this research four irrigation treatments (applied water at the ratios of 1.0, 0.8, 0.65, and 0.5 of canola potential water requirements as I1, I2, I3, and I4 treatments, respectively) were tested. Results showed the evapotranspiration, WUE and IWUE of canola were all affected by controlled volumes of irrigation water. The highest amount of daily evapotranspiration was observed as 9.84 mm d-1 in mid July at the treatment I1. The WUE reached its maximum value at a seasonal evapotranspiration of 483 mm, and then started to decrease with increasing evapotranspiration. The values of WUE and IWUE were between 2.97 – 3.13 and 3.57-4.29 kg ha-1mm-1, respectively. The amount of yield response factor (Ky) was found smaller than 1 in the canola growing season. It was concluded that canola was a water stress tolerant crop and could be cultivated in arid and semi arid regions such as Iran.


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