Showing 4 results for Oustan
E. Shirmohammadi, N. Aliasgharzad, Sh. Oustan, N. Najafi, B. Shirmohammadi,
Volume 1, Issue 3 (Journal of Science and Technology of Greenhouse Culture 2010)
Abstract
Arbuscular mycorrhizal fungi (AMF) can affect their host plants growth through nutrient uptake enhancement. Determination of chelators (siderophores and phytosiderophores) in root leachates is of importance in order to account for the effects of AMF on nutrient uptake by plants. In this study, tomato plants were inoculated with either Glomus intraradices or Glomus etunicatum or left un-inoculated as non-mycorrhizal control, in pots containing sterile and acid washed perlite. Rorison’s nutrient solution harbouring three levels of Fe, Mn, Zn and Cu (full strength, half strength and without micronutrients) was applied to the pots during three month- growth period. Root leachates were collected and total chelator concentration was quantified by titration with DTPA. Plant roots showed lower mycorrhizal colonization in this condition. The amounts of chelators produced by roots were significantly different in AMF species. In plants inoculated with G. intraradices, the highest chelator production occurred in the absence of micronutrients and in its half strength as well, but the micronutrient levels had no significant effect on chelator production in plants inoculated with G. etunicatum. In the absence of micronutrients, chelator production was higher in G.intraradices inoculated plants compared to the G. etunicatum ones.
N. Hosseini Khanmyry, K. Hashemimajd, Sh. Asghari, Sh. Oustan, F. Keivan Behjou,
Volume 2, Issue 4 (Journal of Science and Technology of Greenhouse Culture 2012)
Abstract
Utilizing sewage sludge as a source of cheap fertilizer and rich in nutrients is common in some parts of Iran. But, too much application causes accumulation of heavy metals in soil, which results in soil pollution and transfer of this pollution to food chain and endangers human and animal health. The aim of this research was to investigate the effect of biological sludge of Tabriz petrochemicals complex on some heavy metals concentration in spring barley grown in a calcareous soil after 6 months of incubation. The experiment was conducted in greenhouse conditions with 5 levels of 0 (control), 25, 50, 75 and 100 ton/ha sewage sludge, in three replications, based on complete randomized blocks design. Soil analysis showed that application of biological sludge significantly increased DTPA extractable Fe, Zn, Mn, Cu and Cd (except 25 ton/ha treatment) compared to the control. The results of plant analysis showed an increase of Fe, Zn and Mn in shoots and Zn and Mn in roots, compared to the control. But elevation of root Fe content was not significant. The amount of Cu and Cd in shoots and roots was below the detection limit of the instrument. Overall, it was concluded that although the application of biological sludge increased the content of heavy metals in soil, but its effect on concentration of toxic elements, such as Cd, in plants was not significant.
M. Abbasi, N. Najafi, N. Aliasgharzad, Sh. Oustan,
Volume 3, Issue 3 (Journal of Science and Technology of Greenhouse Culture 2012)
Abstract
In a greenhouse research, the effects of soil water conditions, sewage sludge and chemical fertilizers on growth characteristics and water use efficiency of rice (Oryza sativa L. cv. Ali Kazemi) were studied in a loamy sand alkaline non-calcareous soil. The study was performed as a factorial experiment in a randomized complete blocks design including soil water conditions in three levels (continuous submergence, alternate submergence and alternate saturation) and source and amount of organic and chemical fertilizers in 10 levels [control, 100% chemical fertilizers (434.8 mg urea, 66.1 mg KH2PO4, 40 mg KCl, 50 mg FeSO4.7H2O, 38.5 mg FeSO4.7H2O, 21.3 mg ZnSO4.7H2O and 7.9 mg CuSO4.5H2O per kg of soil), 20 g sewage sludge per kg of soil with and without 50% of chemical fertilizers, 40 g sewage sludge per kg of soil with and without 50% of chemical fertilizers, 20 g poultry manure per kg of soil with and without 50% of chemical fertilizers and 40 g poultry manure per kg of soil with and without 50% of chemical fertilizers] with three replications. At the end of growth period, tiller and leaf number per plant, length and diameter of stem, length and volume of roots, and shoot and root dry matter were measured and water use efficiency (WUE) was calculated. The results showed that application of 20 and 40 g poultry manure per kg of soil prevented the growth of rice due to increase of soil salinity. Application of 20 and 40 g sewage sludge per kg of soil increased significantly tiller and leaf number per plant, length and diameter of stem, length and volume of roots, shoot and root dry matter and WUE compared to control and 100% chemical fertilizers treatments. Addition of 50% chemical fertilizers to 40 g sewage sludge per kg of soil did not significantly affect tiller and leaf number per plant, stem length, volume of roots, shoot dry matter and WUE of rice. The highest tiller number per plant, stem diameter, root length and the ratio of shoot dry matter to that of root were observed in continuous submergence treatment. The highest WUE of rice plant was in alternate saturation treatment. The effect of soil water conditions on plant height, leaf number per plant and shoot dry matter was not significant. In general, alternate saturation with application of 40 g sewage sludge per kg of soil could be recommended to achieve optimum growth of rice plant and increase of WUE.
S. Aliyar, N. Aliasgharzad, Sh. Oustan, A. Dabbagh Mohammadi Nasab,
Volume 12, Issue 3 (Journal of Soil and Plant Interactions 2021)
Abstract
Quinoa (Chenopodium quinoa Willd.) is a plant with high nutritional value and growth potential, thus has a proper production in adverse environmental conditions. However, the enhancement of plant growth in these conditions could be achieved by different approaches. The use of endophytic microorganisms such as Serendipita indica fungus may help plant growth, especially under salt-stressed conditions. In this research, an experiment was performed using a factorial completely randomized design with three replications in a sterile sandy loam soil under greenhouse conditions. Experimental factors included two levels of S. indica (inoculation and non-inoculation) and salinity levels of 1.47 (initial electrical conductivity of soil), 5, 10, 20 and 30 dS/m which prepared by sodium chloride solution. The results showed that the interaction effect of salinity and fungal inoculation was significant for all measured characteristics (P < 0.05) except for proline. The inoculation of S. indica was able to increase the fresh weight of quinoa shoot by 18.5, 15.0, 39.4 and 45.4% compared to the non-inoculated treatment at salinity levels of 1.47, 5, 10 and 20 dS/m, respectively. The inoculation caused an increase in shoot fresh weight by 18% at initial electrical conductivity (5 dS/m), while a marked increase (~41%) was observed in inoculated plants compared to the no fungus treatment at EC level of 20 dS/m. The fungus increased the root weight by 12.9, 20.1 and 31.5% at salinity levels of 1.47, 5 and 10 dS/m compared to the non-fungal treatment, respectively. Compared to the non-fungal plants, the electrolyte leakage was significantly reduced in the inoculated plants at 10 dS/m. Fungal inoculation had pronounced effect on relative water content (RWC) of leaf at 5 dS/m and increased RWC by 23%, compared to the non-fungus treatment. Moreover, the increasing of salinity stress up to 30 dS/m reduced the percentage of root colonization by 19.9% compared to the non-fungus control. Overall, the application of S. indica significantly increased the biomass production of quinoa under salinity stress conditions
