Showing 6 results for Dashti
A Razavinasab, A Tajabadi, H Shirani, H Dashti,
Volume 13, Issue 47 (4-2009)
Abstract
To study the effect of nitrogen, salinity and organic matter on growth and root morphology of pistachio (Cv. Badami), a greenhouse experiment was conducted. Treatments consisted of four nitrogen (N) levels (0, 60, 120 and 180 mg kg-1 soil as urea), four salinity levels (0, 800, 1600 and 2400 mg NaCl kg-1 soil) and three organic matter (OM) levels (0, 2 and 4% soil as farmyard manure). Treatments were arranged in a factorial manner in a completely randomized design with three replications. As the salinity levels increased, leaf, stem and root dry weights and root density, were significantly reduced. Addition of N up to 120 mg kg-1 soil, had no significant effect on growth, but the highest N level (180 mg kg-1), due to nutrient imbalance, reduced abovementioned plant parameters. In low salinity levels, N application improved the growth of pistachio seedlings, but at the highest salinity level, N addition didn’t suppress the adverse effects of soil salinity. Due to useful physical and nutritional properties of soil organic matter, addition of OM significantly increased leaf, stem and root dry weights, stem height, shoot/root ratio and root density.
L Omidi, H Dashti, V Mozaffari, A Tajabadipour,
Volume 14, Issue 52 (sumer 2010)
Abstract
This study was carried out to evaluate the application of zinc and copper sulfate by different methods such as foliar application and deep-placement and time of application on the some quantitative and qualitative properties of pistachio trees. For this purpose, a complete randomized block design experiment with 12 fertilizer treatments and 3 replications at 2 consecutive years was conducted in the experimental garden of Rafsanjan. Treatments included deep-placement of medium amounts (54.2 and 11.1 kg/ha of elemental Zn and of Cu respectively) and high amounts (81.3 and 16.7 kg/ha of Zn and of Cu respectively), foliar application of 0.15 kg/ha elemental Cu in the form of Cu sulfate and 1.8 kg/ha of the elemental Zn in the form of Zn sulfate (34%) at the rate of 1000 liter water on Esfand (late dormant), Farvardin (after flowering) and Mehr (post harvest) . Results indicated that in first year, the maximum yield was obtained with foliar application of Cu on Esfand. Also, qualitative properties such as Split/non split ratio significantly increased by above treatment. The protein content increased with foliar application of Cu on Esfand and Zn on Farvardin by 22 and 16.5%, respectively compared to the control. The analysis of leaf samples, demonstrated that the foliar spray of Cu+Zn on Esfand increased Zn leaf by 119% as compared with control. In second year, yield increased by the foliar application of Zn on Esfand. Also, qualitative properties such as the number of seeds per ounce significantly increased by foliar application of Cu on Mehr. The highest and the lowest rate of split/non-split ratios were observed in treatments of high and low localized placement. The protein content decreased in the treatment of high deep placement as compared to the control. Foliar spray of Zn on Esfand caused the highest increase of leaf Zn concentration and foliar spray of Cu and Zn+Cu in Mehr increased significantly Cu leaf. The results indicated that the effects of treatments on oil content and stem nutrients concentration were not significant on two years. Due to saline and lime effects in the soil in pistachio orchards, soil application of micronutrients had no significant on the the yield.
H. Shirani , E. Rizahbandi, H. Dashti, M.r. Mosaddeghi, M. Afyuni,
Volume 15, Issue 55 (spring 2011)
Abstract
Organic matters are the most important factors that affect soil compactability and physical characteristics. In order to study the effect of pistachio waste on physical characteristics of two soils, a factorial experiment was conducted in a completely randomized design with three replications in a greenhouse. The treatments included pistachio waste at 4 levels (0, 3, 6 and 9 w/w %) and two types of soil texture (silty clay loam and sand).The results showed that the bulk density of sandy soil was decreased at high levels of waste application before compaction but had no significant effect on the bulk density of clay soil. The penetration resistance of both soil types was decreased by pistachio waste application. Soil water holding capacity increased and moisture curves shifted up for higher levels of organic matter application, while compaction curve reciprocally shifted into the lower levels by incorporation of wastes into the soils. At higher levels of organic matters, maximum bulk density was decreased and critical moisture was increased specially in fine texture soil. After compaction, the application of pistachio waste significantly reduced penetration resistance in silty clay loam soil relative to control but in sandy soil its effect on penetration resistance was only significant at maximum level (9 %).
M. Ansari Azabadi , H.shirani, H. Dashti, A. Tajabadipur ,
Volume 15, Issue 57 (fall 2011)
Abstract
Calcareous and gypsiferous soils are restricting factors for uptake of some plant nutrient elements and plant production. Most soils in Iran are calcareous and gypsiferous. Therefore, the aim of this study was the evaluation of calcium carbonate (Caco3) and gypsum effect on availability of some nutrients and corn growth. This study was conducted in a greenhouse at Vli-e-Asr University of Rafsanjan. Treatments were arranged in a factorial manner as a completely randomized design with three replications. Treatments were three levels of Caco3 (0, 20 and 40 g/100g soil), gypsum at three levels (0, 15 and 30 g/100g soil) and two soil textures (Sand and Silt clay loam). Results indicate that irrespective of soil texture, Caco3 application significantly decreased leaf area (by 80% and 15% for sand and silty clay loam texture, respectively), dry weight (by 80% and 15% respectively), plant height (regressed on Caco3 percentage by slopes -0.7 and -0.15 for sand and silty clay loam respectively), and shoot Fe (-9.67 and -11.3) and Zn (-0.24 and -1) uptake, but had no significant effect on shoot Cu uptake. In sandy soil, application of gypsum, significantly decreased leaf area (80%), dry weight (62%), and shoot Cu uptake (slope= -1.93), but had no significant effect on plant height and shoot Zn uptake. Gypsum application significantly reduced shoot Fe uptake (slope= -24.86) in fine textured soil, but it had no significant effect in coarse textured soil.
S. Marofi, N. Parsafar, Gh. Rahimi, F. Dashti,
Volume 16, Issue 61 (fall 2012)
Abstract
In this study, a completely randomized experiment was designed with four irrigation treatments and three replicates. The irrigation programs were raw wastewater, treated wastewater, a combination of 50% raw wastewater and 50% potable water and a combination of 50% treated wastewater and 50% potable water. The experiments were run within a greenhouse. The lysimeters were built up on September 2009 and they were filled with two layers of soil. The upper (0-30 cm in depth) and lower (30-70 cm in depth) layers were sandy loam and sandy clay loam, respectively. A total of eight watering programs with an interval of elevens-day were applied. After each irrigation program, intake wastewater and drainage water of each Lysimeter was sampled in order to analyse the transport of heavy metals (Cu, Zn, Fe and Mn, Ni, Cd and Pb). Results showed that the effect of water quality was significant on percentage of transport of heavy metals. The lowest transport percentage of heavy metals belonged to raw wastewater treatment. Also, the highest percentage of transport of Cu, Zn, Fe, Ni and Pb belonged to the combination of 50% raw wastewater and 50% potable water. In most cases, we observed that the transport percentage of these elements increased by continuing the irrigation
S. Farahi, M. Hamidpour, H. Shirani, H. Dashti, M. Heshmati,
Volume 17, Issue 66 (winter 2014)
Abstract
This research was conducted to study the effect of natural and polyacrylamide-modified montmorillonite on the sorption of Cd from aqueous solutions. The sorption of Cd on the sorbents was studied as a function of pH (Cd concentration: 10 mg L-1) in the range of 4-8.5, and as a function of metal concentration (Cd concentration in the range of 1-10 mgL-1) using a 24h batch equilibration. Experimental and modeling data from equilibrium investigations revealed that the Koble–Corrigan sorption model describes the interaction between Cd and the two sorbents better than the Freundlich and Langmuir models. The values of KF constant of Freundlich and KL constant of Langmuir models were higher for sorption of Cd onto the modified montmorillonite than for those of natural montmorillonite. Maximum sorption capacity calculated from the Langmuir model was 0.6 and 0.7 mg g-1 for natural and modified montmorillonite, respectively. These values are indications of high sorption affinity of Cd to montmorillonite in the presence of polyacrylamide. The amount of Cd sorbed by modified montmorillonite decreased by increasing solution pH while Cd sorption by natural montmorillonite increased by increasing the solution pH.
