Reyhane Rabbani; Farshid Ghaderi-Far; Ebrahim Zeinali; afshin soltani
Volume 22, Issue 3 , Summer 2020, , Pages 345-359
Abstract
In order to investigate the effect of row spacing on yield and growth of cotton cultivars uncer two conditions of fertilizer application and non-fertilization, a study was conducted in Gorgan as a split-factorial experiment based on randomized complete blocks design with three replicates in 2017. Experimental ...
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In order to investigate the effect of row spacing on yield and growth of cotton cultivars uncer two conditions of fertilizer application and non-fertilization, a study was conducted in Gorgan as a split-factorial experiment based on randomized complete blocks design with three replicates in 2017. Experimental factors included three cotton cultivars (Sajedi, Kashmar and Golestan), row spacing at two levels (20 and 80 cm) and nitrogen, phosphorus and potassium fertilizers application at 350, 300 and 225 kg ha-1 and control treatment (No fertilizer), respectively. According to the results of analysis of variance, the effect of cultivar on number of reproductive branches and bolls as well as the height of first boll from ground was significant, whereas row spacing significantly affected number of vegetative branches and bolls, the height of first boll from ground, boll weight and lint yield. In all three cultivars studied, decrease in row spacing led to decreased plant height and increased leaf area index, dry matter and lint yield. Fertilization led to significant increase in plant height, leaf area index, number of reproductive branches and bolls, boll weight and yield. Among interactions, only the interaction of cultivar× row spacing on number of reproductive branches and interaction of row spacing× fertilizer on boll number, boll weight and lint yield were significant. Therefore, there is a significant interaction between row spacing and nutrient consumption in terms of growth characteristics and yield of cotton cultivars, and decreased row spacing in cotton can significantly increase lint yield.
mohsen malek; Farshid Ghaderi-Far; Benjamin Torabi; HamidReza sadeghipour
Volume 22, Issue 1 , Winter 2020, , Pages 27-42
Abstract
To investigate the effects of drying methods (desiccation treatment), heat shock and osmotic stress treatments on the viability of primed seeds from different rapeseed cultivars, an experiment was conducted in 2017-2018 at the Seed Research Laboratory of Gorgan University of Agricultural Sciences and ...
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To investigate the effects of drying methods (desiccation treatment), heat shock and osmotic stress treatments on the viability of primed seeds from different rapeseed cultivars, an experiment was conducted in 2017-2018 at the Seed Research Laboratory of Gorgan University of Agricultural Sciences and Natural Resources. In this study, seeds of three canola cultivars i.e. Dk-xpower, Teraper and Hayola50, which had observed priming treatments, were exposed to desiccation, heat shock and osmotic stress treatments. Thereafter, to investigate the effects of different treatments, the treated seeds were subjected to controlled deterioration test. Finally, after fitting the three-parameter logistic model to germination percentage during controlled deterioration test, time for decrease of germination to 50% was Calculated and used as the criterion for comparing seed viability. Results showed that the response of rapeseed cultivars to different treatments were different. Also, priming methods and different treatments in drying phase of primed seeds, displayed different effects on seeds' lifespan. In general, heat shock treatments were found efficient in Dk-xpower and Traper cultivars as they increased seeds' lifespan. In contrast, osmotic stress treatments often had negative effects on seed viability in all canola cultivars. Even, "osmopriming" and subsequent slow drying of primed seeds had more negative effects than "hydroperiming" associated with fast drying methods.
Morteza Gorzin; Farshid Ghaderi-Far; Seyed Esmaeil Razavi
Volume 21, Issue 2 , Summer 2019, , Pages 167-180
Abstract
In order to investigate effects of different fungicide spraying treatments on soybean seed quality, a split plot experiment was conducted in a randomized complete block design with three replications in research field of Gorgan University of Agricultural Science and Natural Resources in 2016. Two spring ...
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In order to investigate effects of different fungicide spraying treatments on soybean seed quality, a split plot experiment was conducted in a randomized complete block design with three replications in research field of Gorgan University of Agricultural Science and Natural Resources in 2016. Two spring (May 28) and summer (July 10) planting dates performed at main plots and fungicides spraying including benomyl, mancozeb, propiconazole, methyl thiophanate, carbendazim and control in two stages R3 and R6 were done in sub plots. Germination, accelerated aging, electrical conductivity, and seed health tests were used to evaluate the quality of seeds. Two fungi Alternaria sp. and Fusarium sp. spread were observed in seed lots, but lower prevalence for Fusarium sp.. Therefore, seed health was most affected by Alternaria sp.. The percentage of healthy seeds in spring sowing date was 21.48% higher than summer sowing date. All used fungicides (especially propiconazole and methyl thiophanate) significantly increased the health, germination, and vigor of seeds compared to control. The produced seeds in summer planting despite of more fungal infection, had higher seed germination and vigor than seeds of spring crops, because of exposing the seed development stages (R5-R8) to low temperatures. In the fact that, air temperature during seed development stages was more important in determining seed germination and vigor compared to pathogens. Therefore, in order to achieve high seed quality, it is appropriate to use summer planting with the utility of suitable fungicides such as propiconazole and methyl thiophanate at R3 and R6 growth stages.
Ali Shayanfar; Farshid Ghaderifar; Rahmatollah Behmaram; Afshin Soltani; Hamidreza Sadeghipour
Volume 19, Issue 4 , Winter 2018, , Pages 881-892
Abstract
Secondary seed dormancy is known as the major reason for seed persistence of canola (Brassica napusL). Volunteer’s rapeseeds emerging from the soil seed bank can lead to unwanted gene dispersal to other plants after breaking secondary seed dormancy. At the current study, secondary dormancy was ...
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Secondary seed dormancy is known as the major reason for seed persistence of canola (Brassica napusL). Volunteer’s rapeseeds emerging from the soil seed bank can lead to unwanted gene dispersal to other plants after breaking secondary seed dormancy. At the current study, secondary dormancy was induced in 41 lines and 5 cultivars of canola under laboratory condition with using polyethylene glycol 6000, during 14 days and secondary seed dormancy recorded. This study was conducted as a randomized complete design. High germination percentage was observed at the all lines and cultivars (higher than 94%), and they were classified at five groups included very low, low, medium, high and very high secondary dormancy using cluster analysis. Among different lines, five genotypes were included at the very low group and two genotypes were included at the very high group. The other lines were placed in average and low groups. It was observed that five varieties (RGS003, Zarfam, Hyola401, Hyola308 and Hyola50) had average secondary dormancy (40-60%) that was related to breeding ignorance about secondary dormancy during seed production process. Lines classification based on different levels of secondary dormancy helps seed producers to select lines with low levels of secondary dormancy along with high yield and other characteristics, in order to deal with problems in seed producing process.
morteza gorzin; farshid ghaderi-far; ebrahim zeinali; seyed esmaeil razavi; mohammad monyan ardestani
Volume 17, Issue 1 , Spring 2015, , Pages 139-153
Abstract
This study was conducted to investigate the effects of planting date, foliar application of benomyl fungicide and potassium silicate in improving the quality of soybean (cv. Williams) seed in Gorgan during 2011 and 2012. In the first year (2011), the experimental treatments were including planting dates ...
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This study was conducted to investigate the effects of planting date, foliar application of benomyl fungicide and potassium silicate in improving the quality of soybean (cv. Williams) seed in Gorgan during 2011 and 2012. In the first year (2011), the experimental treatments were including planting dates (April 20, May 13, June 3, June 29 and July 22) and foliar application of benomyl fungicide (used at R3 + R6 or unused) and in the second year (2012) were including planting dates (May 1 and July 7), foliar application of benomyl fungicide, silicon (Si) and silicon + benomyl. Water-soluble potassium silicate as silicon supply, in three stages (V6, R1 and R4), at the concentration of 40 grams per liter was sprayed on the leaves. The results showed that an increase in air temperature during seed filling period (R5-R7) in the early planting dates is the most important factor in reducing seed quality. Also, a significant negative correlation was observed between seed infection by Phomopsis sp. and Nigrospora sp. and seed germination and vigor. Delayed planting by reducing the temperature during seed filling period and seed infection by this pathogenic fungi, increased seed quality. Foliar application of benomyl fungicide and potassium silicate by reducing seed infection by pathogenic fungi, improved the quality of soybean seeds. Thus, the delay in planting of precocious cv. Williams, foliar application of potassium silicate and benomyl fungicide in reproductive stages can be advised as the strategies to enhance the seed quality of this cultivar to the farmers and seed producers in Gorgan.