AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 10 potx

... water-shed. Therefore, this approach may not be suitable for small watersheds.Sequential (before-after) design involves monitoring of the same watershed dur-ing both pre-BMP and post-BMP phases ... to on-farm resources and little or no off-farm nutrient inputs are necessary. Finally, a farm could haveexcess nutrients, where on-farm nutrient resources greatly exceed the on-farm nutri-ent ... quality impacts of agricultural nonpoint source pollution is the tem-poral variability of the surface water flow, ground-water recharge, and agricultural practices. Loftis and Ward137emphasized...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 6 potx

... loads for organic carbon, total N, and total Pfor a completely forested watershed, a cropland/riparian forest watershed, and a pas-ture-dominated watershed for a 4-year period in the Rhodes River ... solids can be handled as a liquid, manure of 5 10% solidscan be handled as a slurry, and manure of 10 15% solids can be handled as a semi-solid. Above 20% solids, most manures can be handled as ... rate in4.5-m deep holding ponds was 10 Ϫ2, 10 Ϫ3, and 10 Ϫ4cm/sec for sand, clay, and loam,respectively. After only 2 weeks of storage, the infiltration rates of dairy lagoon efflu-ent were...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 8 potx

... Computations8.5.4 System Layout and Installation8.5.5 Operations and System Management 8.6 Soil and Crop Management Aspects of Water-Table Management 8.7 Water Quality Impacts8.7.1 Hydrology 8.7.1.1 Conventional ... systems.8.6 SOIL AND CROP MANAGEMENT ASPECTS OFWATER-TABLE MANAGEMENT The Southeast and Mid-Atlantic Coastal Plain have variable rainfall during the grow-ing season. This, combined with sandy soils ... effect on the amount and timing of NO3-N and total N in sub-surface drainage waters. Gold and Loudon39compared P and N losses from conser-vation tillage (chisel plow) and conventional tillage...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 2 pot

... Romkens, M. J. M. Source of soil eroded by water fromupland slopes, in Present and Prospective Technology for Predicting Sediment Yields and Sources, ARS-S-40.1975. USDA-Agric. Research Service, ... water resource conservation and nonpoint source assessments, including sediment load assessment and inventory,conservation planning and design of sediment control, and the advancement of sci-entific ... process-based erosion models. On the other hand, the standard model for most erosion assess-ment and conservation planning is the empirically based USLE. Active research and development of USLE-based...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 3 ppt

... inter-face of aquifers with silt- and clay-confining beds and along riparian areas adjacentto streams. McMahon and Bohlke 105 examined the effects of denitrification and min-ing on NO3loadings to ... No. 8 8-2 040, ASAE, St. Joseph, MI, 1988.120. Baker, J. L., Agricultural areas as nonpoint sources of pollution, in EnvironmentalImpacts of Nonpoint Source Pollution,Overcash, M. R., and Davidson, ... A.B., and Wilke, O.C., Effects of irrigation methods on ground-water pollution by nitrates and other solutes. Report No. EPA-600/ 2-7 6-2 91, EPA,Washington, DC, 1976.143. McNeal, B. L. and Carlile,...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 4 pdf

... to “edge-of-field,” and there must be an agent capable of continuing the trans-port of P from edge-of-field to the aquatic system. Except where P leaching is sig-nificant, the edge-of-field ... environment are important factors in under-standing the potential for, and impacts of, P transport through watersheds in agricul-tural and native landscapes. The fate and transport of P depend to a great ... 1975. Sediment-yield prediction with the universal equation using a runoffenergy factor. In: Present and prospective technology for predicting sediment yields and sources.ARS-S-40. Agricultural...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 5 pot

... triflu-ralin, dicamba, DCPA, and 2-4 -D. The most frequently detected insecticides werealdicarb and its degradates and carbofuran, whereas the most widely detected fumi-gants were 1,2-dibromo-3-chloropropance ... no-tillage and pre-emergent, disk and pre-emergent, plow and pre-emergent, disk and preplant incorpo-rated, and plow and preplant incorporated. In total, 63.5 and 127 mm of rainfall wereapplied ... practice and method of chemicalapplication on atrazine and alachlor losses through runoff and erosion on four sites in Kansas and Nebraska. The five treatments evaluated were no-tillage and pre-emergent,...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 7 ppsx

... AFFECTING NONPOINT SOURCE POLLUTION Nonpoint source pollution in arid and semiarid areas of the western United States and elswhere is the result of irrigating land in these areas. Thus, developing and ... IrrigationRecommended distribution uniformities under low-wind conditions range between 70 and 80% for periodic-move systems (hand-move, wheel-line) and © 2001 by CRC Press LLC64. Schwankl, L., Improving ... spe-cial circumstances and may not reflect the field-wide uniformity.7.5 REDUCING DRAINAGE FROM IRRIGATED LAND:A CONCEPTUAL APPROACHReducing nonpoint source pollution from irrigated land...

AGRICULTURAL NONPOINT SOURCE POLLUTION: Watershed Management and Hydrology - Chapter 9 pot

... needed to develop and apply 3-D data structures and processing techniques to improve the capabilities of current GIS-WQ-modeling sys-tems (Lee et. al., 109 Tempfli, 110 Lin and Calkins111). ... Point and Nonpoint Sources, BASINS Verson 2.0User’s Manual. EPA-823-B-9 8-0 06, Washington, D.C., 199858. Aller, L., T. Bennett, J. H. Lehr, and R. Petty, DRASTIC: A system to evaluate the pol-lution ... incorporate the state-of-the-art understanding of theprocesses being modeled and are aimed at improving our understanding of the com-plex processes governing the hydrologic and water quality response...

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