Hosein Tavakoli Neko; Schahram Banedjschafie; Abbas Pourmeidani
Volume 31, Issue 1 , June 2024, , Pages 1-14
Abstract
Background and objectivesThe vast country of Iran, due to its location in the arid region of the earth and the lack of rainfall, has suffered from drought and groundwater depletion. The reduction of precipitation and soil moisture has a great effect on soil vegetation. The use of various types of moisture ...
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Background and objectivesThe vast country of Iran, due to its location in the arid region of the earth and the lack of rainfall, has suffered from drought and groundwater depletion. The reduction of precipitation and soil moisture has a great effect on soil vegetation. The use of various types of moisture absorbent materials that reduce water consumption and increase the time of plant access to water in the soil plays a big role in water conservation. Plantbac panels are made from cellulose waste and can be used to increase the water retention capacity of the soil in dry areas, especially in desert areas. MethodologyIn order to investigate the effect of Plantbac panels on the amount of water consumption and growth of Atriplex plant, the research was carried out in the area of Hesarsokh located ten kilometers north-east of Qom city for three years (2019-2021). The experiment was carried out as split plots in the form of randomized complete blocks including 12 plots in three replications. The main plot included irrigation treatments at intervals of 10 days (control) and 20 days, and the sub-plot included two treatments of using and not using Plantbac panels (control). To investigate the effect of Plantbac panels on seedling growth at the end of each growing season in each year, traits including: survival, height and crown diameter of the seedling were measured and compared with the control of the same treatment. Statistical analyzes including minimum and maximum traits, standard deviation, simple variance analysis of variables, compound analysis, comparison of averages with least significant difference (LSD) method for seedling height growth and crown diameter growth traits were performed. ResultsThere was no difference in seedling survival in the treatments of using Plantbac and control in irrigation with a 10 days interval. While in the treatment of Plantbac panels and the control, 5% of the seedlings were dried, and in the treatment of using the Plantbac panels, 21% and 40% of the seedlings were seen in the control. Combined variance analysis showed that the simple effects of using Plantbac panels, year and the interaction effect of irrigation in the year on the height growth of Atriplex were significant (P≤0.01). Also, the effect of irrigation treatments, the use of Plantbac panels, the mutual effect of irrigation in the year and the effect of the year had a significant difference in the diameter growth trait of the crown of Atriplex seedlings (P≤0.05). The comparison of the average traits showed that the Atriplex seedlings in the "3rd year × 20 days irrigation interval" had the highest height 6.32 cm, and in the "1st year × 20 days irrigation interval" with 9.75 cm, had the lowest height growth. Also, Atriplex seedlings had the highest crown diameter growth in the "3rd year × irrigation interval 10 days " with 22.11 cm growth, and the lowest crown diameter growth had in the "2nd year × 20 day interval irrigation" with 17.33 cm. ConclusionThe results of the research showed that the effect of Plantbac panels on the traits indicating the growth of Atriplex is effective. The use Plantbac panels reduces losses in the survival of Atriplex seedlings. In other words, the use of Plantbac panels can have an effect in reducing the losses of Atriplex seedlings in saline lands. Also, the height growth of Atriplex in the treatment of using Plantbac panels was higher than the control. The general results of the research showed that the use of Plantbac panels can have an effect in reducing the losses of Atriplex in saline lands. Also, the diameter and height growth of Atriplex in the following years of planting was higher than the first year, which can be due to the possibility of establishing and improving the soil conditions for plant growth in the following years after planting as a result of using Plantbac panels.
Hosein Tavakoli Nekou; Abbas Pourmeydani; Seyed Mehdi Adnani; Hosin Bagheri; Mahmoud bayat
Volume 26, Issue 3 , September 2019, , Pages 650-659
Abstract
Haloxylon is a resistant tree naturally found in some desert areas of Iran, which sometimes faces dieback. This research was conducted to investigate the factors affecting the dieback of this species in Hossein Abad Mish-Mast Qom. Growth and yield traits including the density of trees, ...
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Haloxylon is a resistant tree naturally found in some desert areas of Iran, which sometimes faces dieback. This research was conducted to investigate the factors affecting the dieback of this species in Hossein Abad Mish-Mast Qom. Growth and yield traits including the density of trees, number of branches, trunk diameter and height, canopy area, tree age, trunk form, pests, and diseases were recorded in the field. Leaf samples were taken from the trees with varying drying and the amount of sodium, potassium, phosphorus, and chlorine was measured. Soil profiles were dug and soil samples were taken from areas with different drought stress of trees to measure physico-chemical characteristics of the soil at different depths. The results showed that there was a direct relationship between the density of trees and their drying. The results of soil analysis showed that soil salinity was an important factor in the establishment of trees since the density of trees decreased by increasing soil salinity. Also, low concentrations of nutrients have been found to be effective in tree growth and yield. The results of leaf analysis showed that the amount of sodium and chlorine in the leaves was very high and in the older trees the amount of these elements was higher in the leaves. The results showed that salinity was not the only cause of drying of the trees but the higher density was more important in causing this problem. Ecological problems and nutritional deficiencies associated with high density and lack of proper planting intervals were the main causes of drying of trees.
Abass Pourmeidani; Mohammad Reza Naeini; Hossein Bagheri; Ghader Karimi
Volume 18, Issue 1 , May 2011, , Pages 58-70
Abstract
The current research was conducted at Qom Fadak Greenhouse to study the effects of different salinity levels on physiologic and morphologic characteristics of three rangeland species (Hordeum fragilis, Agropyron desertorum and Agropyron elongatum). A factorial experimental design based on completely ...
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The current research was conducted at Qom Fadak Greenhouse to study the effects of different salinity levels on physiologic and morphologic characteristics of three rangeland species (Hordeum fragilis, Agropyron desertorum and Agropyron elongatum). A factorial experimental design based on completely Randomized Design with three replications was applied as the main factor included three rangeland species and the second factor included five salinity levels (0, 50,100,150 and 200 mMol NaCl). Salinity treatments were applied for 66 days and 27 variables were evaluated during the experiment. Results of analysis of variance showed significant differences among studied species and also different salinity levels. According to the results of means comparison test in 15 treatments (interaction effects of species and salinity), the highest RWC was observed in treatments of control (0 mM NaCl) and 50 mM NaCl in all three species and the lowest RWC was recorded at 200 mM NaCl in two Agropyron species. As a result, reduction in RWC was identified as plant response to salinity stress. The highest content of total chlorophyll was observed in control treatment and in two Agropyron species while the lowest content was recorded at 200 mM NaCl in all three species. With increase in salinity level up to 200 mM NaCl, soluble carbohydrate content increased. The highest percentage of proline was observed at 200mMol NaCl and in all three species. According to the results, threshold of salinity tolerance for Ag. elongatum, Ag. desertorum and Hordeum fragilis were determined 150, 100 and 50 mM NaCl respectively, and Ag. elongatum was identified as the most salt tolerant species in this research. A significant positive correlation was observed among growth parameters while correlation between growth parameters and carbohydrate content and percentage of proline was significantly negative. Total chlorophyll content showed a significant positive correlation with RWC and a significant negative correlation with WSD, soluble carbohydrates content and percentage of proline.
Mahdi Adnani; Abbas Pourmeidani; Mahdi Farahpour
Volume 16, Issue 1 , December 2009, , Pages 11-21
Abstract
This research plan was accomplished for introducing suitable plant species in semi-steppic regions of Qom province for increasing of the forage production in destroyed rangelands. The study area was in Veshnaveh with altitude of 2000 m above sea level and the annual rate of precipitation about 290 mm. ...
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This research plan was accomplished for introducing suitable plant species in semi-steppic regions of Qom province for increasing of the forage production in destroyed rangelands. The study area was in Veshnaveh with altitude of 2000 m above sea level and the annual rate of precipitation about 290 mm. The seeds of range species were cultivated in complete randomized block design. Three times of cultivation were done during 1377-80 that the first and second cultivations were unsuccessful due to insufficient quantity and distribution of precipitation. The third cultivation was done in 1379 and data recorded for 3 years. Of twelve cultivated species only four species of Festuca rubra, Festuca ovina, Elymus junceus,and Agropyron trichophorum did not germinated. 25 to 35 percent of Agropyron cristatum, Agropyron desertorum, Stipa barbata and 55 to 85 percent of Bromus tomentellus, Hordeum bulbosum, Secale montanum and Psatyrostachys fragilis were established. Psatyrostachys fragilis and Secale montanum reached to seed stage at first year and other species excluding Stipa barbata reached to flowering stage in the second year. Stipa barbata flowered in the third year. The percentage of flowering was different in all of the species. Analysis of variance of data showed survival of species had a significant difference in third year after inplanting (p=0.01).The means comparison of survival in grasses indicated that Psatyrostachys fragilis and Hordeum bulbosum had the most survival percentage so these species had the best adaptation into climatic and edaphic conditions of the area under study.