the prevalent method of irrigation in paddy fields in iran is continuous ponding, which changes to intermittent method at the time of water shortage. soil cracks are the main problem in intermittent irrigation. in this study, effects of adding rice straw on some soil physical characteristics and cracks were studied in paddy soils of the guilan province of iran. the experiment was performed as s...

The content of carbon and nitrogen, as well the carbon-to-nitrogen ratio in genetic horizons soil cover, yedoma deposits organic residues syngenetic ice wedges (IW) upper IW complex Batagay megaslump were studied. studied soils belong to silty-loam Spodic Cryosol (Dystric,Humic) post-pyrogenic (Dystric,Humic). To study nitrogen content, first second tiers tested. highest values C/N obtained hor...

Rotylenchulus reniformis is rapidly becoming the most economically important pest associated with cotton in the southeastern United States. Incentive programs have been implemented to support sampling of production fields to determine the presence and abundance of R. reniformis. These sampling programs have dramatically increased the number of soils samples submitted to nematology laboratories ...

Silty clay can be found in the alpine region of Qinghai province, China, where it is subject to annual freeze-thaw cycles. To investigate static mechanical properties silty modified by basalt fiber and powder under action cycles, triaxial compression tests scanning electron microscope were conducted on soil. The test results revealed that varying number cycles resulted different effects soil st...

Loose sands (siliceous, silty, and calcareous classes) are extensively found near arid areas in Egypt. Furthermore, many geotechnical structures, like water channels roads, may be constructed on weak or loose sand soils. The behavior of is usually connected with different interdependent problems, such as high permeability, low shear strength, bearing capacity, seepage, stability. This work char...