SURFACE RUNOFF AND LATERAL SUBSURFACE FLOW AS A RESPONSE TO CONSERVATION TILLAGE AND SOIL-WATER CONDITIONS

Conservation tillage has significant potential as a water management tool for cotton production on sandy, drought-prone soils. Plant residue remaining at the soil surface from prior crops serves as a vapor barrier against water loss, reduces raindrop impact energy, slows surface runoff, and often increases infiltration. By increasing infiltration, the potential for greater plant-available water can be enhanced and irrigation requirements reduced. Five years of data were collected to quantify the hydrologic differences between strip till and conventional till production systems. Surface runoff and lateral subsurface flow were measured on six 0.2 ha plots in South Georgia in order to quantify the water-related effects of conservation tillage. Significant differences in surface and subsurface water losses were observed between the conventional and strip tilled plots. Surface runoff from the conventionally tilled plots exceeded that from the strip tilled plots, while subsurface losses were reversed. Surface runoff losses from the conventionally tilled plots exceeded those from the strip tilled plots by 81% (129 mm/year). Shallow lateral subsurface losses from the strip tilled plots exceeded those from the conventionally tilled plots by 73% (69 mm/year). Overall, a net annual gain of 60 mm of water was observed for the strip tilled plots.

[1]  W. G. Knisel,et al.  An approximate method for partitioning daily streamflow data , 1984 .

[2]  J. T. Touchton,et al.  Sediment, nitrogen, and phosphorus runoff with conventional- and conservation-tillage cotton in a small watershed , 1994 .

[3]  R. Baumhardt,et al.  Rain Infiltration as Affected by Wheat Residue Amount and Distribution in Ridged Tillage , 1996 .

[4]  Randy L. Raper,et al.  Conservation Tillage Systems for Cotton in the Tennessee Valley , 2002 .

[5]  David D. Bosch,et al.  RAINFALL CHARACTERISTICS AND SPATIAL CORRELATION FOR THE GEORGIA COASTAL PLAIN , 1999 .

[6]  H. N. Holtan.  Field manual for research in agricultural hydrology , 1962 .

[7]  H. P. Denton,et al.  Tillage effects on corn production and soil physical conditions , 1995 .

[8]  Soil and Water Losses as Affected by Tillage and Manure Application , 2002 .

[9]  J. D. Greer,et al.  Soil Loss from Cotton with Conservation Tillage , 1985 .

[10]  J. T. Touchton,et al.  Surface Runoff and Sediment Yield from Various Tillage Systems of Cotton , 1988 .

[11]  Kenneth Ray Olson,et al.  LONG-TERM TILLAGE EFFECTS ON PHYSICAL PROPERTIES OF ERODED SOIL , 1998 .

[12]  R. L. Blevins,et al.  Tillage effects on sediment and soluble nutrient losses from a Maury silt loam soil. , 1990 .

[13]  M. J. M. Römkens,et al.  Nitrogen and Phosphorus Composition of Surface Runoff as Affected by Tillage Method 1 , 1973 .

[14]  J. Sheridan.  RAINFALL-STREAMFLOW RELATIONS FOR COASTAL PLAIN WATERSHEDS , 1997, Applied Engineering in Agriculture.

[15]  B. L. Schmidt,et al.  Effect of Corn (Zea mays L.) Stover Mulch on No-Tillage Corn Yield and Water Infiltration1 , 1968 .

[16]  M. Onstad.  Influence of tillage systems on soil physical parameters and infiltration after planting , 1984 .

[17]  R. A. Leonard,et al.  Reduction of Soil Erosion by the No-Till System in the Southern Piedmont , 1979 .

[18]  R. Allmaras,et al.  Soil organic carbon sequestration potential of adopting conservation tillage in U.S. croplands , 2000 .

[19]  Eddie C. Burt,et al.  Conservation tillage and traffic effects on soil condition , 1994 .

[20]  Robert J. Lascano,et al.  Soil and Plant Water Evaporation from Strip-Tilled Cotton: Measurement and Simulation , 1994 .