18 مرداد 1399
شهريار مهدوي

شهریار مهدوی

مرتبه علمی: دانشیار
نشانی: ملایر- دانشگاه ملایر- دانشکده کشاورزی- گروه علوم ومهندسی خاک
تحصیلات: دکترای تخصصی / خاکشناسی
تلفن: 0812355338
دانشکده: کشاورزی

مشخصات پژوهش

عنوان
Iron and magnesium nano-oxide effects on some physical and mechanical properties of a loamy Hypocalcic Cambisol
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Penetration resistance, Physical and mechanical properties, Soil amendment, Total porosity, Volumetric water content
سال
2019
مجله GEODERMA
پژوهشگران شهریار مهدوی

چکیده

Nanoparticle effects on mechanical and physical properties of soil have rarely been investigated, particularly those of iron and magnesium nano-oxides. This study investigated the effects of the application of nano-oxides on total porosity, mean weight diameter (MWD) of aggregates, volumetric water content at a matric potential of −100 kPa, penetration resistance, and saturated hydraulic conductivity. Nanoparticle type (two types comprising iron and magnesium nano-oxides), application dosage (four dosages of 0, 1, 3, and 5% by weight), and incubation period (40 and 100 days) comprised the factors considered. The magnesium nano-oxide treatments increased (P < 0.05) total porosity by reducing soil bulk density due to the smaller size of magnesium compared with iron by 0.04 cm3 cm−3. After both incubation periods, each application dosage of magnesium nano-oxide increased (P < 0.05) the MWD of the aggregates, ranging from 0.47 to 2.91, compared with the control and all of the iron nano-oxide dosages because of the large flocculation capacity of magnesium nano-oxide. The 1 and 3% applications of magnesium nano-oxide increased (P < 0.05) the water content, ranging from 0.01 to 0.02 cm3 cm−3 compared with the control and 1 and 3% of the iron nano-oxide dosages, possibly by increasing the specific surface, stabilizing the soil structure, and increasing the microporosity. Penetration resistance increased (P < 0.05) about 0.14–0.28 MPa under the iron nano-oxide treatments whereas penetration resistance decreased (P < 0.05) about 0.21–0.33 MPa under the magnesium nano-oxide treatments. The saturated hydraulic conductivity decreased (P < 0.05) after both incubation periods with iron (24–61%), and after incubation for 40 days with magnesium (38–56%). However, the saturated hydraulic conductivity increased (P < 0.05) from 46 to 61% after incubation for 100 days with magnesium. It was concluded that magnesium nano-oxides can improve selected soil physical and mechanical properties