hamdolah eskandari; ashraf alizadeh
Abstract
A field experiment was conducted in Selseleh County, Lorestan Province, during 2015-16 growing season to evaluate the effects of planting pattern and partial root zone irrigation (alternate furrow irrigation) on water and land productivity under wheat and Persian clover intercropping system. The experiment ...
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A field experiment was conducted in Selseleh County, Lorestan Province, during 2015-16 growing season to evaluate the effects of planting pattern and partial root zone irrigation (alternate furrow irrigation) on water and land productivity under wheat and Persian clover intercropping system. The experiment was carried out as a two-factor factorial with three replications. The first factor was irrigation management at two levels of conventional (I1) and partial root-zone irrigation (I2) based on root depth, and the second was planting pattern including sole wheat (W), sole Persian clover (C), wheat-Persian clover alternate-row intercropping (WC1) and wheat-Persian clover within-row intercropping (WC2) systems. Water consumption, leaf relative water content, grain yield, water productivity and land equivalent ratio were used to evaluate the treatments. Water consumption of all planting patterns in partial root-zone irrigation system was significantly (P≤0.01) lower than that of conventional irrigation. Grain yield of wheat and Persian clover in partial root-zone irrigation was lower than that of conventional irrigation, where wheat and Persian clover yield decreased by 27% and 36%, respectively. However, grain yield and water consumption reductions resulted in higher water productivity (23%, 92%, 51%, and 44% in sole wheat, sole Persian clover, wheat-Persian clover alternate-row intercropping, and within-row intercropping, respectively). Land equivalent ratio of intercropping in partial root-zone irrigation was 19% more than that of conventional irrigation, suggesting that intercropping reduced the negative effect of lower water supply, because relative water content of wheat and Persian clover was higher in intercropping compared to sole cropping. Therefore, partial root-zone irrigation can be suggested as an effective method for increasing water productivity in grain production of wheat and Persian clover.
m n; h a; m k; h n
Abstract
In order to investigate the effect of different levels of salinity on physiological traits in fenugreek, an experiment was conducted at the greenhouse of Ferdowsi University of Mashhad, using Completely Randomized Design with 10 replications. Treatments included irrigation water salinities of 0, 60, ...
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In order to investigate the effect of different levels of salinity on physiological traits in fenugreek, an experiment was conducted at the greenhouse of Ferdowsi University of Mashhad, using Completely Randomized Design with 10 replications. Treatments included irrigation water salinities of 0, 60, 120, and180 mM sodium chloride. The results showed that different levels of salinity had negative effects on physiological characteristics at 60, 120, and 180 mM sodium chloride and reduced shoot biomass by 37%, 50%, and 53% ; fruit biomass by 8%, 34%, and 45%; and 16% of chlorophyll index and 0, 4%, and 27% chlorophyll a/b, respectively, compared with 0 mM sodium chloride.
Razieh Sarabadabani; Mohammadreza Bihamta; Zahra Shobar; Maryam Shahbazi; Amin Karami; Mohammadreza Naghavi; Hamidreza Nikkhah; Hossein Dehghanisanij
Abstract
To study the effects of terminal drought stress on yield and some physiological traits of barley (Hordeum vulgare L.), four cultivars, namely, Nosrat, Fajr 30, Yousef, and Moroco, and 2 advanced lines i.e. 17 and 67 were evaluated under terminal drought stress condition in Agriculture Biotechnology Research ...
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To study the effects of terminal drought stress on yield and some physiological traits of barley (Hordeum vulgare L.), four cultivars, namely, Nosrat, Fajr 30, Yousef, and Moroco, and 2 advanced lines i.e. 17 and 67 were evaluated under terminal drought stress condition in Agriculture Biotechnology Research Institute of Iran, in 2011. The glasshouse experiment was arranged as a split-plot in a randomized complete block design with three replications. The results of the experiment revealed that total biomass, grain yield, yield components, harvest index (HI), relative water content (RWC), leaf water potential (WP), stomatal conductance, and chlorophyll content significantly decreased while relative water loss (RWL), unfilled grains per spike, canopy temperature and electrolyte leakage significantly increased in drought condition. Yousef and Moroco could be considered as, respectively, drought-tolerant and drought-sensitive genotypes, with grain yield (575 and 142 g.m-2), relative water content (78.2% and 69 %) and decrease in rate of stomatal conductance (63% and 93 %) in drought stress, respectively. The results of principal component analysis suggested that some of the physiological traits such as RWC, stomatal conductance, and canopy temperature, as the first important component, could be used for genotype screening under terminal drought stress.