خلاصة:
The main limiting factors in saline-sodic soils are high amounts of salts, low soil organic matter (SOM) and low
availability of macro and micro-nutrients. The effect of different amounts of nano iron oxide powder and urban solid
waste compost coated sulfur (USWCS) on the chemical properties of a saline-sodic soil was investigated. The experiment
was conducted using a randomized complete block design with factorial arrangement and three replications, in a farm
near Qom city. Treatments used in this study included USWCS (0 and 15 ton/ha) and nano iron oxide powder (0 and 20
mg/kg); treatments were applied to treated plots of 4 m2 and sunflower seeds were sown. The results show that 20 mg/kg
of nano-iron oxide, significantly (P<0.05) increased electrical conductivity of saturation extract (ECe), availability of
nutrient elements (5.26, 30, 18.18% for phosphorous (P), iron (Fe), and copper (Cu), respectively) in soil, while nitrogen
(N), pH and sodium adsorption ratio (SAR) in soil decreased significantly (P < 0.05). Fifteen (15) tons/ha of USWCS
significantly increased soil ECe (6.1%), micro and macro-nutrients amounts (8.3, 21.1, 46.6, 45. 5, and 14.9% for N, P,
Fe, Cu, and Manganese (Mn) respectively), but significantly (P < 005) decreased the soil pH and SAR, compared to the
control. The combined effect of 20 mg/kg of nano iron oxide and 15 ton/ha of USWCS increased micro-nutrient
availability, but decreased soil pH and SAR significantly. It was concluded that the combined application of USWCS
and nano iron oxide increased the availability of nutrients in saline-sodic soil.
ملخص الجهاز:
"ir Desert 20-1 (2015) 39-46 Effects of nano iron oxide powder and urban solid waste compost coated sulfur on chemical properties of a saline-sodic soil A.
The effect of different amounts of nano iron oxide powder and urban solid waste compost coated sulfur (USWCS) on the chemical properties of a saline-sodic soil was investigated.
The combined effect of 20 mg/kg of nano iron oxide and 15 ton/ha of USWCS increased micro-nutrient availability, but decreased soil pH and SAR significantly.
Sodic soils due to high pH and high calcium carbonate application of USWCS and nano iron oxide to soil, in addition to increasing acidic strength and higher solubility of Ca-compounds, increased infiltration rate and Na-leaching and as a result, decreased SAR in the studied soil.
In addition, the interaction effect of USWCS and nano iron oxide resulted in maximum availability of micro- nutrients in the studied saline-sodic soil, as the concentrations of Fe, Mn, Cu, and Zn increased by 94, 39, 86, and 160%, respectively, compared to the concentrations before sunflower sowing.
Based on the results obtained, the combined application of USWCS and nano iron oxide, even with the use of saline-sodic irrigation water, can be used to increase the availability of nutrients in saline-sodic soil for plant uptake and increase the yield of sunflower.
Effects of Nano iron oxide powder and urban solid waste compost coated sulfur on sunflower yield and yield components in saline- sodic soil."