tailieunhanh - Saturated hydraulic conductivity variation in cultivated and virgin soils

Variation of saturated hydraulic conductivity (Ks) values of soils under diverse management practices may be needed to determine the required sample number, sample size, and chose suitable sample scheme for characterize the Ks values used in water flow and solute transport modelling studies. | Turk J Agric For 30 (2006) 1-10 © TÜB‹TAK Saturated Hydraulic Conductivity Variation in Cultivated and Virgin Soils Tekin ÖZTEK‹N Department of Agricultural Structures and Irrigation, University of Gaziosmanpafla, Tafll›çiftlik Campus, 60250 Tokat - TURKEY Sabit ERfiAH‹N Department of Soil Science, Faculty of Agriculture, University of Gaziosmanpafla, Tafll›çiftlik Campus, 60250 Tokat - TURKEY Received: Abstract: Variation of saturated hydraulic conductivity (Ks) values of soils under diverse management practices may be needed to determine the required sample number, sample size, and chose suitable sample scheme for characterize the Ks values used in water flow and solute transport modelling studies. The purpose of this study was to examine the variability in Ks and try to understand some part of the determinism of this variability in virgin and adjacent cultivated field using 36 undisturbed soil samples from each location with grid space. Ks was measured with 100 cm3 undisturbed soil cores in laboratory using falling or constant head methods. The results showed that variability of ln (Ks) values (variance = ) at the cultivated site was times greater than that (variance = ) at the virgin site. Furthermore, significant Ks differences exist between cultivated sample locations and within the rows of each cultivated location. Greater variations occurred in two cultivated locations may be attributed to compaction by traffic and soil tillage resulting in heterogeneous bulk density over the study area. Key Words: Saturated hydraulic conductivity, Cultivated field, Virgin field, Soil compaction, Bulk density ‹fllenen ve ‹fllenmeyen Toprakta Doygun Hidrolik ‹letkenlik De¤iflkenli¤i Özet: Su ak›fl› ve eriyik madde tafl›n›m›n›n modellemeleri çal›flmalar›nda kullan›lan doymufl hidrolik iletkenli¤in tan›mlanmas› için gerekli olan örnekleme say›s› ve miktar›n›n belirlenmesi ve uygun örnekleme plan›n›n seçiminde farkl› uygulamalar .

• Nông nghiệp
• Saturated hydraulic
• Cultivated field
• Virgin field
• Soil compaction
• Bulk density
• Textural class
• Saturated hydraulic conductivity
• Soils in Hirakud command area
• Continuous irrigation
• Continuous irrigation on soil texture
• Red and lateritic soil
• Lateritic soil
• Diverse land use systems
• Lateritic highland soils
• Multiple regression equation
• Principal component analysis
• Minimum data set
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp
• Incomplete sphere
• Wetted bulb
• Wetting front coordinates
• Surface trickle irrigation system
• Penetration resistance
• Spatial variability
• High soil bulk density
• Green manures
• Organic carbon
• Economics involved in its incorporation
• In situ incorporation green manures
• Soil organic carbon
• Bulk heterojunction
• Solar cells
• Copper oxide nanoparticles
• Thin films
• Photo current density
• External quantum efficiency
• Renewal theory
• Discrete time
• Bulk renewal process
• Generating function
• Asymptotic results
• Renewal density
• Artificial neural networks
• Cone index
• Regression models
• Water content
• Arya and Paris model
• Particle size distribution
• Scaling parameter
• Soil water retention curve
• Minimum tillage
• Wheat yields
• Conventional tillage
• Infiltration functions
• Furrow irrigation
• Wetted perimeter
• Wet bulk density
• Initial soil water content
• Aggregate stability
• Corn growing field
• Organic manures
• Physico chemical properties
• Chilli cultivation
• Caliper Method
• Buoyancy Method
• Helium Displacement Pycnometer
• Mucury Intrusion Posimetry
• Physical properties
• Measurement techniques
• Land use systems
• Organic matter accumulation
• Total porosity
• Maximum water holding capacity
• Bulk density models
• Carbon cycle
• Carbon stock
• Pedotransfer function
• SOC stock
• Predicting draft requirement
• Tillage implements
• Pull type load cell in southern
• Bermuda grass
• Korean grass
• St augustine grass
• Centipede grass
• Soil bulk density
• Soil EC
• Soil porosity
• Rice straw mulch
• Rice husk mulch
• Coirpith compost mulch
• Available soil N
• P2O5 and K2O
• Biomass material
• Calorific value
• Cutting capacity
• Energy requirement
• Volatile matter content
• Tractor drawn rotavator
• College farm to evaluate
• Soil bulk density after tillage treatment
• Tillage treatment by harrow
• Establishment methods
• Moisture regimes
• Hydraulic conductivity
• Infiltration rate
• Penetration resistance of soil
• Organic matter
• Bio fertilizer
• Awareness camp
• Far western development
• Clodinafop+ Metsulfuron
• Hand weeding
• Weed management
• Cold extrusion
• Response surface methodology
• Jaggery based cold extruded products
• Agro processing industries
• Soil texture
• Water holding capability
• Porosity etc
• Sunflower spinachsunflower crop rotation
• Poplar based agro forestry
• C sequestration
• available P
• Available K