Journal of Food, Agriculture and Environment

Effects of water stress and different levels of nitrogen on growth analysis parameters of sunflower

Author(s):

Mani Mojaddam ¹, A. Shokuhfar ¹, Sh. Lack ²

Recieved Date: 2011-11-18, Accepted Date: 2012-01-03

Abstract:

In order to study the effects of water stress and different levels of nitrogen on growth physiological indexes of sunflower hybrid Iroflor, an experiment was conducted as a split plot randomized complete block design. The treatments composed of three irrigation treatments (I) including I₁ (optimum irrigation), I₂ (moderate stress) and I₃ (severe drought stress) were done after depletion of 30, 40 and 50 percent of the field capacity, respectively, as the main plot and three nitrogen levels N1, N2 and N3 consisting of 80, 140 and 200 kg N ha^-1, respectively, were placed as sub plots. Increased drought stress severity caused significant decrease in leaf area index (LAI) and dry matter accumulation. By increase of nitrogen application LAI and dry matter accumulation significantly increased. Results showed that the highest crop growth rate (CGR), relative growth rate (RGR) and net assimilation rate (NAR) obtained under optimum irrigation condition. As nitrogen application increased, CGR increased but RGR and NAR remained unchanged. Results showed that under drought stress condition variation of CGR was affected by variation of LAI and NAR, but variation of CGR in nitrogen levels was affected by variation of LAI. 

Keywords:

Sunflower, drought stress, nitrogen, water use efficiency, growth physiological indexes

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Environment
Pages: 839-842

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