Raheleh Ghale Ghafi; Hossein HajiAbaee; Fathieh Nabhani; Salvia Mohammadpour; Zahra Ardanji Kalate Siyahdasht
Abstract
This study was carried out to investigate the effect of mycorrhizal fungi (Rhizophagus irigularis) and rhizobacteria (Pseudomonas fluorescens) on maize under different fertilization conditions as greenhouse research in the Jalin region of Gorgan in 2018 during two separate experiments. The aim of the ...
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This study was carried out to investigate the effect of mycorrhizal fungi (Rhizophagus irigularis) and rhizobacteria (Pseudomonas fluorescens) on maize under different fertilization conditions as greenhouse research in the Jalin region of Gorgan in 2018 during two separate experiments. The aim of the first experiment was to compare the conventional soil incubation with seed-coating incubation, and the second experiment was to assess the growth of maize incubated with mycorrhizal fungi and plant growth-promoting rhizobacteria through seed-coating at three treatment levels of Hoagland nutrient solution (Control, 80 and 100 volumetric percentage of Hoagland solution). In both experiments, at 70 days after seed-coating, one gram of maize roots and soil attached to it were sampled and DNA was extracted from the maize rhizosphere. In the first experiment, there was no significant difference between the conventional soil incubation and seed-coating incubation according to the dry weight of stems and roots, roots’ longitudinal colonization percentage, arboscol abundance, vesicles abundance, and elements concentration. In the second experiment and under full fertilizing conditions, mycorrhizal incubation showed a significant increase in concentrations of nitrogen, phosphorus, potassium, and zinc (18.1, 3.5, 56, and 46.0 mg/kg, respectively) compared to the control (12.6, 3.1, 39.6, and 24.4 mg/kg, respectively), and the bacterial incubation showed a significant increase for magnesium, zinc, and manganese (2.0, 42.6, and 145 mg/kg, respectively) compared to the control (1.0, 24.4, and 60 mg/kg, respectively).
Laila Alizad; Marefat Mostafavi Rad; Kayvan Aghaei
Abstract
This experiment was performed to evaluate the effect of nitrogen source type and plant growth promoting bacteria on yield and its attributes of Talesh local garlic as split plot arrangement based on randomized complete block design with three replications in Rasht during the 2016-2017 cropping season. ...
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This experiment was performed to evaluate the effect of nitrogen source type and plant growth promoting bacteria on yield and its attributes of Talesh local garlic as split plot arrangement based on randomized complete block design with three replications in Rasht during the 2016-2017 cropping season. Three nitrogen sources of vermicompost (15 ton/ha), nitrogen (100 kg /ha), integrated utility of vermicompost (7.5 ton/ha) with nitrogen (50 kg /ha) as main plot and ten preparation of plant growth promoting including of non-inoculation (as check), Azospirillum brasilense, Azospirillum lipoferum, Pseudomonas putida, Pseudomonas fluorescens, Azotobacter, Azospirillum + Pseudomonas, Azospirillum + Azotobacter, Pseudomonas + Azotobacter, Azospirillum + Pseudomonas + Azotobacter as sub plot comprised experimental treatments. The greatest bulb yield was obtained under the usage of 100 kg nitrogen per hectare as urea fertilizer and simultaneous application of Pseudomonas and Azospirillum spp. There was a positive and significant correlation between bulb yield and all traits such as biological yield, bulb diameter, bulb height, clove numbers per bulb, clove weight, dry weight of bulb, dry weight of stem, leaf numbers per plant and plant height except bulb shell layers. Also, the correlation between yield attributes such as clove numbers per bulb, clove weight, bulb diameter, bulb height and vegetative characteristics of bulb plant was positive and significant. In general, bulb yield and its attributes showed different responses to nitrogen sources and plant growth promoting bacteria. Application of Azospirillum + Pseudomonas could be recommendable to improve bulb yield in conventional agriculture and under region climatic condition.
Leila Mohammadi; Saeed Rizi; Abdorrahman Mohammadkhani; Rahim Barzegar
Abstract
To evaluate the effect of slow release fertilizer and humic acid on quality of New Guinea Impatiens (Impatiens hawkeri), an experiment established in complete random design with 15 treatments and three replications. Treatments were slow release fertilizer (12-11-18-2.7MgO-8S) in five levels (0, 1.5, ...
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To evaluate the effect of slow release fertilizer and humic acid on quality of New Guinea Impatiens (Impatiens hawkeri), an experiment established in complete random design with 15 treatments and three replications. Treatments were slow release fertilizer (12-11-18-2.7MgO-8S) in five levels (0, 1.5, 3, 4.5 and 6 kg/m3) and humic acid in three levels (0, 2 and 4 kg/m3) that mixed with medium culture. The substrate medium was included 50 percecnt of peat moss, 40 percent of perlite and 10 percent of rice husk (v/v). Five months after seeding, results showed the most flower number (20 number) in 6 kg/m3 mixed with 2 kg/m3 of humic acid, and the most leaf number (122 number) in 3 kg/m3 of slow release fertilizer treatments. The slow release fertilizer treatment showed a positive significant effect in all traits. Also, humic acid had a positive significant effect on plant height, leaf and shoot number, leaf area, total chlorophyll, shoot fresh weight, flower diameter, flower life and flower number. Considering that, humic acid in 2-4 kg/m3 and slow release fertilizer in 3-4.5 kg/m3 could be recommended for New Guinea Impatiens cultivation.