Ronak Shirzadian Gilan; yahya parvizi; Ebrahim Pazira; Farhad Rejali
Volume 28, Issue 2 , June 2021, , Pages 381-394
Abstract
Soil pollution by petroleum hydrocarbon pollutants is one of the most important environmental problems in different parts of the world. In the oil-rich regions of the west of the country and recent years, the depreciation of the oil extraction and exploitation system has led to leakage and distribution ...
Read More
Soil pollution by petroleum hydrocarbon pollutants is one of the most important environmental problems in different parts of the world. In the oil-rich regions of the west of the country and recent years, the depreciation of the oil extraction and exploitation system has led to leakage and distribution of oil pollutants in the soil and biological resources of the region. This study aimed to investigate the potential use of native rangeland plants and the addition of bacteria, and the amount of appropriate fertilizer to reduce pollution of total petroleum hydrocarbons (TPHs) in the soil. The pot experiment was performed in the form of a factorial design with a completely randomized design (CRD) with four replications. Plant treatments included three native or compatible plants of Medicago sativa, Agropyron trichophorum, and Atriplex canescens and bacterial treatments included Bacillus pumilus (B1), Pseudomonas putida (B2), and the combined use of these two bacteria with fertilizer recommendation based on soil testing. Also, control treatment (no plant culture, no bacterial inoculation, and no fertilization) was applied. The results showed that Medicago sativa, with a 55.16% reduction in soil TPHs had better performance than other plants. Inoculation of B1 bacterium in interaction with Medicago sativa and Agropyron trichophorum by decomposing 56.19% of soil TPHs was more successful than B2. However, Atriplex canescens was more successful than B1 in interacting with B2 bacteria and decomposing 54.64% of soil TPHs. With full fertilizer recommendation, Medicago sativa and Atriplex canescens plants were most effective, with a 68.56% reduction in soil TPHs. In soil treatment without plant cultivation, B2 bacterium had the best performance along with fertilizer recommendation. Bacteria improve phytoremediation efficiency by improving metabolic activities and developing the root system, and ultimately increasing plant biomass. The results showed a significant effect of interaction between bacteria and plant type on plant shoot dry weight at the level of α = 0.01.
Ghasemali Abarsaji; Seyed Ali Hoseini
Volume 11, Issue 1 , September 2019, , Pages 32-44
Ahmad Rahmani; Shahpour Hajrasouliha
Volume 10, Issue 1 , August 2019, , Pages 57-76
Gholam reza Ghaderi; Ali Gazanchian; Mahmood Yousefi
Volume 15, Issue 2 , January 2008, , Pages 256-268
Abstract
Intercropping is considered for increasing and stability of yield in per unit. In general, mix cropping legumes and grasses species has been applied to enhancement of nutrient value and supply energy and protein on grasses and legumes respectively. A field experiment, was conducted to compare forage ...
Read More
Intercropping is considered for increasing and stability of yield in per unit. In general, mix cropping legumes and grasses species has been applied to enhancement of nutrient value and supply energy and protein on grasses and legumes respectively. A field experiment, was conducted to compare forage production of mixed alfalfa (Medicago sativa v. cody) and wheatgrass (Agropyron desertorum) species with proportion of 33, 50 and 66 percent and pure cropping in the north Khorassan (Sisab station) from 1994 to2001 with two levels 15 and 20 kg/ha of seeding rate. The seeds were sown into furrows with 40 cm wide for row intercropping and broadcasting for mixed cropping treatments. The treatments were arranged in split plot and randomized complete block design with four replications. Forages harvested at flowering and heading stage of alfalfa and wheatgrass, respectively. Dry matter weight considered for comparison of yield production of the treatments. The average forage yields of alfalfa and wheatgrass were 1.8 and 1.2 ton/ha respectively in pure stands. Alfalfa standes gradually dominated the wheatgrass in mixed and row intercropping. The highest yield was obtained in the mixed cropping of 66% alfalfa and 33% wheatgrass. There were no differences between seeding rate treatments. However, the results suggest that the best combination species for improving production is 66% alfalfa and 33% wheatgrass. This ratio could be used for renovation of pastures in the poor and dry areas in north Khorassan province.