Seyed Mahdi Adnani; Mohammad Reza Tatian; Ehsan Zandi Esfahan; Reza Tamartash; Hosein Bagheri
Volume 27, Issue 2 , June 2020, , Pages 215-223
Abstract
Important and influential factors on livestock production in arid areas are limited water resources, increasing salinity and lack of food. Halophytes are especially important in saline habitats as alternative forage sources. Forage quality is one of the main factors determining the nutritional requirements ...
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Important and influential factors on livestock production in arid areas are limited water resources, increasing salinity and lack of food. Halophytes are especially important in saline habitats as alternative forage sources. Forage quality is one of the main factors determining the nutritional requirements of livestock and subsequently the grazing capacity of rangelands. Determination of forage quality of rangeland species is one of the fundamental factors for proper rangeland management. The quality of forage varies in different places and times and different factors affect it. Awareness of forage quality of halophytes at each phenological stage, not only helps beneficiaries in arid and desert areas to select suitable plant species for planting in haloculture programs, but also sets the appropriate time for grazing to achieve greater livestock performance in saline lands. In the present study, the effects of phenological stages on eight forage quality traits were investigated for three halophytes ie., Halocnemum strobilaceum, Nitraria schoberi and Suaeda aegyptiaca. Plant samples were collected in vegetative, flowering, and seeding stages from saline lands in the margin of Houze Sultan, Qom province. Data were analyzed by a factorial experiment in a completely randomized design. Duncan mean comparison test was performed. The results showed that the effects of species and phenological stages on forage quality were significant (p < /em><0.01). In general, the results of this study indicated the superiority of Ha. strobilaceum in terms of nutritional value compared to Ni. schoberi and Su. aegyptiaca, so that it can be considered as a new source of forage in the lands affected by salinity.
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.