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

... Rill and Interrill Erosion Processes 2. 2 .2 Rill Erosion 2. 2.3 Interrill Erosion 2. 2.4 Sediment Transport 2. 2.5 Eroded Sediment Size Fractions and Sediment Enrichment 2. 3 Soil Erosion Models 2. 3.1 ... (1-H) a P p (2. 29) As for the case of entrainment by flow, all of the source terms in Equations 2. 18 and 2. 29 are actually written for individual settling velocity cla...

Ngày tải lên: 11/08/2014, 15:20

... triflu- ralin, dicamba, DCPA, and 2- 4 -D. The most frequently detected insecticides were aldicarb and its degradates and carbofuran, whereas the most widely detected fumi- gants were 1 , 2- dibromo-3-chloropropance ... 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...

Ngày tải lên: 11/08/2014, 15:20

... al., 57 AL Alfalfa - spring b 20 5 21 1 year 10.7 12. 1 Young and Mutchler, 58 MN Alfalfa - fall b 28 5 55 1 year 13 .2 13.3 Young and Mutchler, 58 MN Corn - spring b 20 5 21 1 year 1.0 2. 4 Young and Mutchler, 58 MN Corn ... manure Fescue 22 0 76 1 event 3.1 2. 6 Edwards and Daniel, 61 AR 879 304 1 event 3.3 3 .2 Edwards and Daniel, 61 AR Fescue 149 85 4 event...

Ngày tải lên: 11/08/2014, 15:20

... (cm) (kg N/ha) 20 3.5 9.6 10.3 5 (0.6) a 17 (1.0) 19 (2. 6) 1 12 3.5 9.1 12. 0 6 (0.1) 22 (1.6) 25 (4.0) 22 4 2. 8 8.4 13.3 4 (0.8) 20 (2. 9) 59 (8.9) 448 5.0 9.9 15.1 6 (0.1) 54 (6.7) 120 (26 ) a Means ... Average NO 3 -N concentrations under no-tillage and conventional tillage, respec- tively, were 29 .4 and 35.6 mg/L at 1 .2 m, 19.6, and 26 .5 mg/L at 1.8, 18.5, and 13.9...

Ngày tải lên: 11/08/2014, 15:20

... J., Watershed- Scale Nonpoint Source Pollution Modeling and Decision Support System Based on a Model-GIS-RDBMS Linkage. Presented at the AWRA Symposium on GIS and Water Resources, Sept. 22 26 , ... Point and Nonpoint Sources, BASINS Verson 2. 0 User’s Manual. EPA- 823 -B-9 8-0 06, Washington, D.C., 1998 58. Aller, L., T. Bennett, J. H. Lehr, and R. Petty, DRASTIC: A system...

Ngày tải lên: 11/08/2014, 15:20

... in a field (Source NRCS, 1998). © 20 01 by CRC Press LLC (4) increased soil organic matter and improved tilth, 22 ,23 and (5) increased food and habitat for wildlife (Code 329 A to 329 C and Code 344). 5 There ... water, American Society Agricultural Engineers, St. Joseph, MO, ASAE Paper No. 8 2- 2 022 ,), 19 82. 30. Blaylock, A. D. and R. M. Cruse, Ridge-tillage corn respons...

Ngày tải lên: 11/08/2014, 15:20

... denitrifi- cation process are N 2 O and N 2 , whereas NO is usually quantitatively of less impor- tance. If O 2 concentrations increase, the ratio between N 2 O and N 2 also increase, whereas NH 4 -N ... Volatilization and Denitrification 3 .2 Sources of Groundwater Contamination 3 .2. 1 Fertilizers 3 .2. 2 Livestock Wastes 3 .2. 3 Land Application of Manures, Sludges, and...

Ngày tải lên: 11/08/2014, 15:20

... 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 dep...

Ngày tải lên: 11/08/2014, 15:20

... for regulating agricultural drainage water, Water Resources Bulletin, American Water Resources Association, 26 (2) :28 9, 1990. 100. Posnikoff, J. F. and Knapp, K. C., Farm-level management of deep ... 990 91 Cotton 1.7 42 1. 528 521 701 1 ,22 3 1,161 92, 93 Cotton 1.815 1.765 533 450 1,341 1,6 62 94 1989 Cotton 1.714 1 .21 4 584 749 1,149 610 1990 Cotton 1.449 1.431 610 500 689 1,0...

Ngày tải lên: 11/08/2014, 15:20