Amir hooshang Jalali; Ahmad Mousapour Gorji
Abstract
The phenomenon of reduced potato yield have increased in recent years under adverse conditions, such as water stress. The effects of water stress on yield and yield component of three potato cultivars have been evaluated in this study during 2019 growing season. This investigation has been arranged as ...
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The phenomenon of reduced potato yield have increased in recent years under adverse conditions, such as water stress. The effects of water stress on yield and yield component of three potato cultivars have been evaluated in this study during 2019 growing season. This investigation has been arranged as split-plot experiment, based on a randomized complete block design with three replications at Rozveh Agricultural Research Station (Chadegan, Isfahan, Iran). The main-plots are assigned to irrigation levels (75% and 100% field capacity) and sub-plots to potato cultivars (Marfona, Agria, and Atousa). To ensure the initial establishment of the plant and prevent severe crop failure, one additional irrigation has been performed at the establishment stage, with two supplementary irrigations performed at the tuber initiation stage for all plots. There has been a significant interaction between irrigation level and cultivars for tuber yields (α<%1) as well as other traits (α<%5). In water stress conditions, yield and water use efficiency of Atousa, new cultivar, are more than the other cultivars. Marketable yield of Atousa cultivar is about 40% higher than Marfona and Agria cultivars. The new cultivar produces 6.53 kg of tubers per cubic meter of water, while water use efficiency for Marfona and Agria is only 4.82 and 5.02 kg m-3, respectively. In conclusion, it is suggested that Atusa cultivar in both water stress and in normal conditions is more suitable for cultivation in the study area than in Marfona and Agria cultivars.
Mohammad Reza Zarea Bavany; Gholamali Peyvast; Mahmoud Ghasemnezhad; Akbar Forghani
Abstract
Salinity is the main limiting environmental factor on plant growth and production. Therefore, finding salinity tolerant cultivars result to increase crop yield and production. However, a factorial experiment was carried out based on randomized complete block design with three replicates in hydroponic ...
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Salinity is the main limiting environmental factor on plant growth and production. Therefore, finding salinity tolerant cultivars result to increase crop yield and production. However, a factorial experiment was carried out based on randomized complete block design with three replicates in hydroponic culture. Two salinity levels (0 and 100mM NaCl) were considered the first factor and 26 greenhouse pepper cultivars was the second. Results showed a significant difference for all studied characteristics. Salt stress decreased all characteristics except to total dry matter percent and sodium concentration. The increase in sodium content accompanied with the decrease in potassium, calcium content and growth indices. Results showed a significant negative correlation between sodium with vegetative indices, potassium to sodium ratio, calcium to sodium ratio in all cultivars. Overall, ‘Paramo’, ‘Efests’ and ‘SPADI’ were known as the most tolerant pepper cultivars. According to finding of this study, the characteristics such as shoot sodium content and stress tolerance index can be used for screening salinity tolerance in pepper cultivars.