Atefeh Beilari; Jamal-Ali Olfati; Masood Esfahani; Nader Pirmoradian
Abstract
This study aims at evaluating the yield of cucumber genotypes in two seasons, and identifying cucumber genotypes with high yield and stability. The research has been carried out in the greenhouse of the Department of Horticultural Sciences, University of Guilan, as a factorial experiment in a completely ...
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This study aims at evaluating the yield of cucumber genotypes in two seasons, and identifying cucumber genotypes with high yield and stability. The research has been carried out in the greenhouse of the Department of Horticultural Sciences, University of Guilan, as a factorial experiment in a completely randomized design in autumn and spring seasons with nine cucumber genotypes in three replications. Results show that in terms of number of female flowers in autumn and spring, genotype C1 with an average of 16.7 per plant and genotype C8 with an average of 7.0 per plant have been the best, respectively. Also, in terms of leaf area, C10 genotype with an average of 2866.6 cm2 in autumn and C8 genotype with an average of 9340.990 cm2 in spring outperform the rest and can be used to achieve suitable hybrids for each growing season. Results of principal components analysis and population biplot show that C8 genotype is a suitable genotype for cultivation in two cropping seasons in terms of stability of yield-related traits and vegetative traits. Finally, in terms of number of fruits, genotype C1 with an average of 5.0 per plant in autumn, and C10 genotype with an average of 5.0 per plant in spring have been superior.
Mahdiye Askary; aliakbar Maghsoudi Moud; Vahidreza Saffari
Abstract
Salt stress is a factor limiting crop growth and productivity around the world. Developing salt tolerant cultivars using desired plant features has been considered as a way to cope with the problem. In this study, a factorial experiment was used in order to determine the effects of salt stress on stomatal ...
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Salt stress is a factor limiting crop growth and productivity around the world. Developing salt tolerant cultivars using desired plant features has been considered as a way to cope with the problem. In this study, a factorial experiment was used in order to determine the effects of salt stress on stomatal length at abaxial and adaxial leaf surfaces, relative water content (RWC) and transpiration rate (TR) under controlled condition. In another experiment yield performance (GY) of the same hybrids was evaluated in a split-plot experiment under field growing condition. Both experiments were based on a RCBD with 3 replications and conducted at the Faculty of Agriculture, Shahid Bahonar University of Kerman in 2011. Results showed that salt stress and hybrid have significant effects on all plant characteristics. Generally, all plant characteristics were decreased by increasing salt stress level. Significant correlation coefficients were found between TR and GY and also RWC and GY. Results also showed that the hybrid SC-704 has the highest levels of RWC and GY under salt stress conditions compared to the others indicating that it can be considered as a salt tolerant one.
Farhad Azizi; Ali Mahrokh
Abstract
In order to comparison and determination of the best drought tolerance indices in sweet corn hybrids, an experiment was conducted using a randomized complete block design in split plot lay out with three replications at Seed and Plant Improvement Institute in Karaj in 2006. Three irrigation levels (irrigation ...
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In order to comparison and determination of the best drought tolerance indices in sweet corn hybrids, an experiment was conducted using a randomized complete block design in split plot lay out with three replications at Seed and Plant Improvement Institute in Karaj in 2006. Three irrigation levels (irrigation after 75 as control, 100 and 125 millimeters cumulative evaporation from class A evaporation pan) were assigned as main plots and 12 sweet corn hybrids include KSC403su, Chase, Esquire, Rival, Reveille, Diva, Shimmer, Shaker, PS107, Golda, Royalty and Rana were considered as sub plots. Mean Productivity (MP), Tolerance Index (TOL), Geometric Mean Productivity (GMP), Stress Susceptibility Index (SSI), Stress Tolerance Index (STI) were used to evaluate tolerance or sensitivity to drought stress of the hybrids. STI and GMP indices had a positive and significant correlation with grain yield in non-stress and stress conditions (mild and severe stress treatments). STI and GMP indices showed that Hybrids Diva and Golda had optimum yield in non-stress condition but their yield decreased in severe stress condition. Hybrids KSC403su, Esquire, Shimmer and Shaker had low yield in non-stress but they had suitable yield in severe stress condition. Hybrids Chase, Rival and Reveille had low yield in non-stress and severe stress conditions. Hybrids PS107, Royalty and Rana had optimum yield in both non-stress and stress condition. Therefore, they can be recommended to use in stress and optimum conditions.
Sajad Kordi; Mohammad Eskandari; Ali Fadavi; Mehrshad Barary; Masoud Rafiee; Ali Ashraf Mehrabi
Abstract
A field experiment was conducted to study the physical properties of maize grain in response to different urea fertilization methods (urea foliar spraying and soil application), three harvest times (grain moisture content of 20, 30 and 40 pecent) in four maize hybrids (three foreign hybrids e.g. NS640, ...
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A field experiment was conducted to study the physical properties of maize grain in response to different urea fertilization methods (urea foliar spraying and soil application), three harvest times (grain moisture content of 20, 30 and 40 pecent) in four maize hybrids (three foreign hybrids e.g. NS640, Jeta600 , Konsur580 and one common hybrid, SC704 as control) at Khorram Abad Agricultural Research Station in 2010. The experimental design was a strip split plot based on a complete block design with four replications. The fertilization method was considered as horizontal factor and the vertical factors were hybrid and grain moisture content (harvest time) in a split plot arrangement. Analysis of variance showed that there were significant differences among grain moiusture at harvest time treatments in terms of length, bulk density, real density and specific grain area. The 20% grain moiusture at harvest time was the best based on the physical properties. Also the effect of fertilization methods was significant for grain width and 1000-grain weight. Results showed that the highest grain width (7.81mm) and thousand kernel weight (257.38g) was achieved at urea soil application.. According to the results, Jeta Hybrid showed better physical properties compared to the other hybrids. Because, this hybrid had the highest real density (1.71 g/cm3), porosity (54.23%) and thousand kernel weight (266.57g), indicating higher grain quality.Key words: corn, fertilizer application, hybrid, porosity, real density.