Saeed Sadeghzadeh Hemayati; Vodod Saidnia; Ghasem Parmoon
Abstract
This study was conducted to investigate the role of application of sulfur and zinc on commercial seed yield of sugar beet Monogerm cultivar in a factorial experiment based on randomized complete block design with three replications. The experimental treatments included sulfur (0, 200, and 400 kg/ha) ...
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This study was conducted to investigate the role of application of sulfur and zinc on commercial seed yield of sugar beet Monogerm cultivar in a factorial experiment based on randomized complete block design with three replications. The experimental treatments included sulfur (0, 200, and 400 kg/ha) and zinc (0, 20, and 40 kg/ha). The results showed that the seed yield and commercial seed yield, as well as the interaction effect of sulfur and zinc, has a significant impact on seed yield alone. With the application of 400 kg/ha sulfur, the raw seed yield increased by 17% and the commercial seed yield increased by 54%. The highest raw seed yield (3443 kg/ha) was obtained with the application of 400 kg/ha of sulfur and 40 kg/ha of zinc. The simultaneous application of sulfur and zinc led to an increase in the proportion of oversized seeds and standard seeds, and a decrease in the proportion of undersized seeds. The highest percentage of oversized seeds was obtained with the application of 400 kg/ha of sulfur and 20 kg/ha of zinc, The application of 400 kg/ha of sulfur resulted in a 12% and 6% increase in mechanical and p sulfur improved both the quantitative and qualitative aspects of sugar beet seed production, while zinc did not have much influence and only increased the quantity of seed produced. Under the conditions of this study, the combination of 400 kg/ha of sulfur and 40 kg/ha of zinc was recommended.
Ali Ebadi; Fatemeh Ahmadnia; ghasem parmoon
Abstract
In order to study the effect of different levels of drought stress and temperature on seed germination of buckwheat, a factorial experiment was conducted as completely randomized design with three replications. Experimental treatments were included different levels of drought stress (0, -0.2, -0.4, -0.6 ...
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In order to study the effect of different levels of drought stress and temperature on seed germination of buckwheat, a factorial experiment was conducted as completely randomized design with three replications. Experimental treatments were included different levels of drought stress (0, -0.2, -0.4, -0.6 and -0.8 MPa) and different temperatures (8, 12, 16, 20, 25, 30, 35 and 40 oC). Results indicated that all models of thermal time, hydro time, and hydrothermal time could predict the germination of buckwheat in temperature and osmotic potential. Basic temperature (Tb) was estimated from -0.98 to 11 oC, optimum temperature (To) from 21.7 to 24.7 oC, and maximum temperature (Tc) from 30 to 41.5 oC, which osmotic potential increased Tb and decrease To and Tc in Buckwheat. Also, increasing temperature enhanced germination rate (decrease θHT from 18 MPa day at 8 oC to 3 MPa day at 35 oC), and decreased stress tolerance due to increasing basic potential (increase ψ50 from -0.927 MPa to 0.043 MPa). According to the hydrothermal time model output, Tb in this plant was about 1.93 oC and at 92 MPa oC day, highest germination rate was recorded and ψTb in this plant in Tb was about -1.31 MPa. Also it was defined that, each of these three models predicted buckwheat seed germination under different temperature and water potential, but hydrothermal time was a general model and we can suggested it.
Tayebeh Alsadat Cheraghi Takht Choobi; Seyed Amir Moosavi; Ahmad zare; Ahmad KoochekZade; ghasem parmoon
Abstract
In order to determine the cardinal temperature of decayed sugarcane seeds, this study was carried out factorially in a completely randomized design with three replications in Khuzestan University of Agriculture and Natural Resources. The first factor was aging at 5 levels (0, 24, 48, 72 and 96 hours ...
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In order to determine the cardinal temperature of decayed sugarcane seeds, this study was carried out factorially in a completely randomized design with three replications in Khuzestan University of Agriculture and Natural Resources. The first factor was aging at 5 levels (0, 24, 48, 72 and 96 hours of decline) and germination temperatures at 7 levels (5, 10, 15, 20, 25, 30, 35 and 40 ° C). The results showed that the percentage and speed of germination were affected by the interaction of temperature in the decay so that their highest value was in the temperature range of 20 to 25 ° C and the decay in addition to reducing their amount increased the range of changes of this plant at different temperatures. The highest germination percentage was observed at 20 ° C in undeveloped seeds and 15 to 20 ° C at 24 and 48 h. Estimation of different non-linear models on germination rate also showed that among the evaluated models, the better toothed model was the model for germination of sugarcane seeds at different levels of decay. The germination basal temperature of sugarcane was estimated to be 1 ° C in non-degradable conditions, which increased to 1.8 ° C in 24 hours of decline and decreased again in higher degradations. The optimum germination temperature of this plant was between 20 to 32 at no aging conditions.
Tayebeh Alsadat Cheraghi Takht Choobi; Seyed Amir Moosavi; ahmad zare; Ahmad KoochekZade; ghasem parmoon
Abstract
The effects of accelerated aging treatment on seed germination of Echinops was quantified using nonlinear models using Sigmoid, Segmented, Gompertz and Richards models and hydrotime model in Weibull, Normal and Gombel distribution functions. Experimental factors were seed aging for (0, 24, 48, 72 and ...
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The effects of accelerated aging treatment on seed germination of Echinops was quantified using nonlinear models using Sigmoid, Segmented, Gompertz and Richards models and hydrotime model in Weibull, Normal and Gombel distribution functions. Experimental factors were seed aging for (0, 24, 48, 72 and 96 hour) at relative humidity (RH)=100%, temperature (T) =40 oC and seven osmotic potential (0, -0.2, -0.4, -0.6, -0.8, -1, -1.2 MPa). Results of experiment revealed that interaction effect of aging and osmotic stress on seed germination and germination rate of Echinopsis was significant. Seed germination parameters of Echinops were increase by aging treatment up to 72 h but it was declined at aging treatment of 96 h. Seed germination and germination rate were increased by aging treatment till 72 h but at 96 h, both were declined. Gompertz exhibited the best fit for no aged, 24 h and 48 h while sigmoid function was provided the best fit for aging at 72 and 96 h. Among all studied distribution function, it was revealed that normal distribution was the most effective one thus base potential (ψb) and hydrotime constant (θH) were -0.68 MPa and 6 MPa hour, respectively. However, after 96 h of aging treatment ψb and θH were estimated 0.731 MPa and 19.3 MPa hour, respectively. It can be concluded that freshly harvested Echinops exhibited some levels of seed dormancy which was alleviated at mild to moderate aging conditions, but after 72 h, deteriorative mechanism led to damaging effects and declined seed germination quality.
seyed ata Siadat; Seyed Amir Moosavi; ghasem parmoon; Samaneh Kiani
Abstract
To study the relationship between seed size and aging on cardinal temperatures of canola cv. Hyola 50, seed germination an experiment was conducted based on a randomized complete design with three replications. Seeds were classified in to four groups based on their diameter (1.4, 1.8, 2 and 2.2 mm) and ...
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To study the relationship between seed size and aging on cardinal temperatures of canola cv. Hyola 50, seed germination an experiment was conducted based on a randomized complete design with three replications. Seeds were classified in to four groups based on their diameter (1.4, 1.8, 2 and 2.2 mm) and considered as the first experimental factor. The Second factor was various durations of accelerated aging treatment (0, 24, 48, 72, 96 and 120 hours (40oC, RH=100%) and the third factor was nine constant temperatures in which seeds were germinated (0, 5, 10, 15, 20, 25, 30, 35 and 40 ˚C). Cardinal temperatures were quantified for germination fraction of 50% using four nonlinear model: beta, beta modify, dent-like and segmented. The result indicted beta model better described responses germination rate to temperature compared with others models and accelerated aging and sizes did not affect the change model base temperature was about 1.15 OC in sizes 1.4 mm and increase in size to 2.2 mm deceased to 0.11 OC. The optimal temperature range was about 21.37 to 21.58 OC and the maximum temperature was 40.2 to 40.8 OC. it was also found that different seed sizes did not have a significant difference in terms of thermal time and deterioration increased the basal germination temperature and thermal time coefficient and reduced the optimal and maximum temperature, that it can show necessity delay in planting date in cold areas or early planting in tropical areas in these types of seeds.
hadis hasanvand; ghasem parmoon; Seyed Amir Moosavi; seyed ata Siadat
Abstract
This experiment was conducted at seed technology laboratory of Agricultural Sciences and Natural Resources University of Khuzestan, in 2018 with the to evaluate the effects of seed priming on cardinal temperatures and thermal time requirements of borage seed germination. The factorial experiment was ...
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This experiment was conducted at seed technology laboratory of Agricultural Sciences and Natural Resources University of Khuzestan, in 2018 with the to evaluate the effects of seed priming on cardinal temperatures and thermal time requirements of borage seed germination. The factorial experiment was arranged based on the randomized complete block design with three replications. Treatments were gibberellic acid (0 (distilled water as control), 100, 200, 400 mg/L-1), priming durations (6 and 12 hour) and seven levels of germination temperatures (5, 10, 15, 20, 25, 30 and 35 oC). Beta model, beta modified, dent-like and segmented were used to determine cardinal temperatures. Results showed that seed germination significantly increased at both priming durations of 6 and 12 hours with increasing of temperature and gibberellic acid concentrations. The highest seed germination was observed at 200 mg/L-1gibberellic acid and 15 oC. Increase of gibberellic acid concentrations resulted higher thermal time requirements to complete 50% of germination in seed population. From the results, the beta model provided the best fit to evaluate cardinal temperatures of borage seeds. It is therefore, suggested that the base, optimum and celling temperatures of borage seeds are 0.51, 21.5 and 35.1 oC and influenced by application 200 mg/L-1GA to 0.33, 23.5 and 35.8 oC.
Samaneh Kiani; Ghasem Parmoon; Seyed Amir Moosavi; seyed ata Siadat
Abstract
In order to quantify the seed germination responses of Fennel ecotypes including Esfahan, Hamadan and Booshehr to osmotic stress with concentrations of (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa) a factorial experiment was conducted based on the completely randomized design with four replications. Experimental ...
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In order to quantify the seed germination responses of Fennel ecotypes including Esfahan, Hamadan and Booshehr to osmotic stress with concentrations of (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa) a factorial experiment was conducted based on the completely randomized design with four replications. Experimental data were subjected to analysis with various statistical distributions to provide more reliable and robust explorations. RSME value of hydrotime model showed that data were well fitted for seed germination of Booshehr. The normal and Gumbel distributions were the best and the worst model to estimate hydrotime model parameters. It was also cleared that among statistical distributions fitted on hydrotime model, the highest base water potential was obtained from Normal distribution -0.41 MPa. For Esfahan ecotype, hydrotime constant was estimated about 89 MPa/hour using Gumbel distribution. There was significant variation in location parameters of various statistical distributions and it has a range of -19.44 (Weibull) to -0.57 (Normal Distributions).
ALI GHATEI; Hamideh Azad; ghasem parmoon
Abstract
In order to study germination characteristics of wheat seeds Chamran cultivar of wheat obtained from Plant that treated with different levels of nitrogen and spraying cytokinin under heat stress conditions, this research carried out in factorial experiment in randomized complete design with four replications ...
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In order to study germination characteristics of wheat seeds Chamran cultivar of wheat obtained from Plant that treated with different levels of nitrogen and spraying cytokinin under heat stress conditions, this research carried out in factorial experiment in randomized complete design with four replications at seed technology laboratory of Agricultural Sciences and Natural Resources University of Khuzestan. In both conditions Normal (optimum planting date) and Terminal heat stress (late planting date), nitrogen (N) was in four levels (0, 75, 150, and 225 kg.ha-1) and cytokinin (Ck) was in three levels (0, 50 and 100 µM). The results showed the simple effects of N fertilizer on all traits, with the exception of hypocotyl and radicle dry weight, weight vigor index, FMOB, SRUE and thousand grain weight were effective significantly. Effect of planting date was effective significantly on all traits, with the exception of hypocotyl dry weight. The cytokinin (Ck) was effective significantly only on germination percentage, germination uniformity, D90, Length vigor index, SRUE and thousand grain weights. Results of interaction showed treatment of N× planting date had the most Germination rate (0.03 per day). The most mobility of seed reserves (1.6 mg per mg seed) and seed vigor (17.19) was obtained from high levels of N×CK treatment. The effect of N ×Ck× planting showed the most germination (100%) was obtained from high levels of N×Ck treatment and the less germination percentage (66%) was obtained from treatment of late planting date and 150 kg ha-1 N and without cytokinin. so cytokinin increased the resistance of wheat against terminal heat stress and increased germination percentage of seed produced.
Ali Ebadi; ghasem parmoon; Fatme Ahmadnia; Mohamad Godarzy; S. Ghahremani
Abstract
In order to quantifying cardinal temperature and hydro time germination of Cuminum cyminum seeds, an experiment was conducted as completely randomized design with three replications in laboratory of Faculty of Agriculture and Natural Resources of University of Mohaghegh Ardabili in 2017. Experimental ...
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In order to quantifying cardinal temperature and hydro time germination of Cuminum cyminum seeds, an experiment was conducted as completely randomized design with three replications in laboratory of Faculty of Agriculture and Natural Resources of University of Mohaghegh Ardabili in 2017. Experimental treatments were included: temperatures as, 0, 5, 10, 15, 20, 25, 30, 35 and 40 ˚C and osmotic potential as 0, -0.2, -0.4, -0.6, -0.8, -1 and -1.2 MPa. Quantifying of cardinal temperature for germination fraction of 10, 50 and 90 % were evaluated from four models as: beta, modified beta, dent-like and segmented. In this study, RMSE and R2 and AICc were used for comparison between models. Result indicted that beta model showed better responses description for germination rate of Cuminum cyminum to temperature compared with others models. However basic temperature of Cuminum cyminum was between 0.7 to 0.9 ˚C, optimum temperature about 20 to 21 ˚C and maximum temperature was 35 ˚C. In addition based on hydro time models results, θH and Ψb(50) of Cuminum cyminum were estimated 97.5 and -0.46 MPa respectively.
ali ghatei
Abstract
In order to study effect of salinity and drought stress on germination and Seedling growth and fitness model hydrotime and threshold tolerance to salinity in two different species Basil, a factorial experiment in a randomized completely design was conducted at University of Mohaghegh Ardebili in 2015. ...
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In order to study effect of salinity and drought stress on germination and Seedling growth and fitness model hydrotime and threshold tolerance to salinity in two different species Basil, a factorial experiment in a randomized completely design was conducted at University of Mohaghegh Ardebili in 2015. Experimental treatments included was two species of basil (Purple basil and Red basil), different salts (Manitol, NaCl+K2SO4, K2SO4 and NaCl) and different potentials (0, -3, -6 and -9). Model output result showed, germination rate in drought stress coundition on Red basil (θH= 37.32) highest than Purple Basil (θH= 37.32) and uniformity of germination in purple basil (σψb=3.37) less than Red basil (σψb=1.44). Also Red basil higher tolerance drought compared with Purple basil. Threshold tolerance to salinity in germination stage showed, in Purple Basil at NaCl, K2SO4 and NaCl+K2SO4 had threshold tolerance -0.59, -0.13 and -0.87 bar and in Red Basil equle -0.31, -0.25 and -2.88 . Salinity and drought stress were causing reduced in the seedling growth and seed vigor index. The most (0.92) and least (0.78) on the use of the reserves in the case of purple basil of NaCl and NaCl + K2SO4, respectively, was observed at the same time. This is while that, the highest use of the reserves on the red basil K2SO4 salt and least amount was obtained application of NaCl. The highest vigor weight index of purple basil was observed of zero osmotic potential. The least weight index purple basil was obtained of the potential -9 bar Mannitol.
