Majid Dashti; Mohammad Fayaz; Gholamreza Hosseini Bamrood
Volume 27, Issue 4 , December 2020, , Pages 802-812
Abstract
In order to determine the appropriate season and method of rangeland planting of Onobrychis chorassanica Bunge., and providing conditions for increasing forage production of degraded rangelands in arid and semi-arid climates, two separate experiments were carried out in split plots in a randomized complete ...
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In order to determine the appropriate season and method of rangeland planting of Onobrychis chorassanica Bunge., and providing conditions for increasing forage production of degraded rangelands in arid and semi-arid climates, two separate experiments were carried out in split plots in a randomized complete block design with four replications during the years 2013 to 2017 in Golestan preserved summer rangeland of Mashhad on the northern slope of the Binalood Mountains. The treatments were rangeland planting seasons (autumn and spring) and planting methods (seeding in pitting and in shallow grooves). In the first experiment, the mean comparisons of the combined analysis for two years showed that the emergence and seedlings establishments were 57.7% and 26.1%, in 2014-2015 growth season, respectively, were significantly higher than the 2013-2014 (21.5% and 10.4%). Results also indicated that the emergence and seedlings establishment percentage (58.8% and 26.8%) in the autumn season showed significant differences with spring (20.4% and 9.7%). Mean comparisons of rangeland planting methods had no significant difference in both growing seasons. The results of the second experiment showed that the seedlings establishment percentage (22.1%) in the 2nd year of establishment was significantly lower than (26.1%) comparing with the first year. Although establishment percentage in autumn season was increased by 2.7 times compared with spring season, but planting dates had no significant effect on leaves, stem and fruit dry matter yield. The planting method with pitting led to a significant increase in leaves, stem, fruit and total areal biomass yield with 2.2, 4.8, 4.2 and 11.2 gr plant -1, respectively, by 58, 33, 14 and 26%, compared to shallow groove planting method. The results of this study showed that autumn rangeland season is preferable to spring but seeding in shallow grooves compared to pitting is not significantly different in increasing the percentage of emergence and seedling establishment. However, seeding in pitting leads to improved forage and seed yield and ultimately production stability.
Shahram Banedjschafie; Esmaeil Rahbar; Farhad Khaksarian
Volume 16, Issue 3 , December 2009, , Pages 305-316
Abstract
The effect of different level of polymer water absorbent (supper A200) mixed with desert sand were studied in comparing to pure sand and clay soil on survival and growth of Panicum antidotale in pot condition in Research Institute of Forests and Rangeland, Tehran, Iran for three years. The polymer ...
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The effect of different level of polymer water absorbent (supper A200) mixed with desert sand were studied in comparing to pure sand and clay soil on survival and growth of Panicum antidotale in pot condition in Research Institute of Forests and Rangeland, Tehran, Iran for three years. The polymer treatments were 0.2%, 0.6% and 1.0% W/W. The irrigation period was determined based on field capacity of pure sand for all treatments. The results showed no significant differences among treatments for plant growth in the first year. However, the treatment of sand with 0.6% polymer had the most survival plants with average values of 100%. The pots were not irrigated in the 2nd year because there were enough precipitations. All survived plants from 1st year were dead at the end of 2nd year. So, the experiment was repeated at the 3rd year. The results showed significant differences among treatments. The survived plant for clay treatment with average values of 6.17 g dry matter per plant had higher production and followed by 0.6% and 1.0% W/W polymer treatments mixed with desert sand. Those treatments had significant differences with pure sand controls. The lower amount of dry matter was obtained by control pure desert sand with average values of 2.91 g dry matter per plant.
Majid Ghorbani javid; Gholamabbas Akbari; Foad Moradi; Eraj Allahdadi
Volume 14, Issue 3 , January 2007, , Pages 336-351
Abstract
In order to study the yield and water relations and osmotic adjustment in sensitive and tolerant genotypes of cutleaf medic (Medicago laciniata(L.) Mill) under drought stress, a greenhouse experiment was conducted in 2004, using a factorial arrangement in RCBD with three replications. Two genotypes of ...
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In order to study the yield and water relations and osmotic adjustment in sensitive and tolerant genotypes of cutleaf medic (Medicago laciniata(L.) Mill) under drought stress, a greenhouse experiment was conducted in 2004, using a factorial arrangement in RCBD with three replications. Two genotypes of cutleaf medic, were treated in four levels of water stress include -0.1, -0.2, -1 MPa as low, medium and high stress levels respectively and Field Capacity (FC = -0.03 MPa). Results indicated that tolerant genotype had a significant superiority to sensitive genotype in most studied characteristics such as yield, Shoot and Root dry matter, Relative Water Content (RWC), Water Potential (ψw), Osmotic Potential (ψs), Turgor Potential (ψt) and Osmotic Adjustment during medium and high water stress levels. This experiment showed that tolerant genotype had important traits; that might be possible to use these characteristics for selection of tolerant medics and recognition of mechanisms of drought resistance.