F. Sohrab; N. Abbasi; A. Mahdipour
Abstract
Introduction: Soil structural stability affects the profitability and sustainability of agricultural systems. Particle size distribution (PSD) and aggregate stability are the important characteristics of soil. Aggregate stability has a significant impact on the development of the root system, water and ...
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Introduction: Soil structural stability affects the profitability and sustainability of agricultural systems. Particle size distribution (PSD) and aggregate stability are the important characteristics of soil. Aggregate stability has a significant impact on the development of the root system, water and carbon cycle and soil resistance against soil erosion. Soil aggregate stability, defined as the ability of the aggregates to remain intact when subject to a given stress, is an important soil property that affects the movement and storage of water, aeration, erosion, biological activity and growth of crops. Dry soil aggregate stability (Mean Weight Diameter (MWD), Geometric Mean Diameter (GMD)) and Wet Aggregate Stability (WAS) are important indices for evaluating soil aggregate stability.To improve soil physical properties, including modifying aggregate, using various additives (organic, inorganic and chemicals), zeolites are among what has been studied.According to traditional definition, zeolites are hydratealuminosilicates of alkaline and alkaline-earth minerals. Their structure is made up of a framework of[SiO4]−4 and [AlO4]−5 tetrahedron linked to each other's cornersby sharing oxygen atoms. The substitution of Si+4 by Al+3 intetrahedral sites results inmore negative charges and a high cation exchange capacity.Zeolites, as natural cation exchangers, are suitable substitutes to remove toxic cations. Among the natural zeolites,Clinoptilolite seems to be the most efficient ion exchanger and ion-selective material forremoving and stabilizing heavy metals.Due to theexisting insufficient technical information on the effects of using different levels of zeolite on physical properties of different types of soils in Iran, the aim of this research was to assess the effects of two different types of zeolite (Clinoptilolite natural zeolite, Z4, and Synthetic zeolite, A4) on aggregate stability indicesof soil.
Materials and Methods: In this study at first, after preparation of two different types of soil with light and medium texture and doing identification tests such as determination of gradation and hydrometer tests and Atterberg limits, zeolite in four levels, 0 (control), 1%, 5%, and 10%w/w, was mixed with two soil textures (sandy loam and silty loam) in three replications. Then, each treatment was saturated for 48 hours in each month, during 6 months. Dry soil aggregate stability (Mean Weight Diameter (MWD), Geometric Mean Diameter (GMD), and Wet Aggregate Stability (WAS)), were determined. The experiment was carried out using factorial method in a randomized complete design.
Results and Discussion:The results showed that, in sandy loam texture, there was no significant difference between two types of zeolites, their level of using and their interaction on MWD (p
M. Movahedan; N. Abbasi; M. Keramati
Abstract
Abstract
Wind erosion of soils and suspended particles in Iran is one of the serious environmental and agricultural problems which affect agricultural lands, water reservoirs, irrigation canals, drains and etc. Therefore wind erosion control needs attention specially in arid and semi-arid regions. Although ...
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Abstract
Wind erosion of soils and suspended particles in Iran is one of the serious environmental and agricultural problems which affect agricultural lands, water reservoirs, irrigation canals, drains and etc. Therefore wind erosion control needs attention specially in arid and semi-arid regions. Although in recent years, some polymeric materials have been used for improvement of structural stability, increasing aggregate stability and soil stabilization, but still some important parameters such as kind of polymer, quantity of polymer, efficiency against wind and water erosion, durability in field conditions and environmental impacts should be considered. In this research, Polyvinyl Acetate-based polymer was used for three different soil textures against wind erosion. Then the effect of this polymer on wind erosion control was investigated and its results were compared with water treated soil samples. The results of wind tunnel with a maximum 26 m/s wind velocity showed that there was a significant difference between the erosion of polymer treated and water treated samples and with application of 25 gr/m2 Polyvinyl Acetate, the erosion of Aeolian sands samples reduced to zero in the experimental conditions in relation to water treated samples. For silty and clayey soils treated by polymer, the wind erosion reduced minimum 90% in relation to water treated samples.
Keywords: Polyvinyl Acetate, Wind erosion, Wind tunnel