Modeling phosphorus in the environment - Chapter 6 pot

... structural errors. There is, therefore, the possibility of unjustifiably rejecting a model because of errors in the data. Thus, in the case of the grazing inputs and the imbalance in the hydrological ... (1) 0. 36 (2) 0.075 ( 3-8 ) 1 × 10 − 26 (9) 6. 0(1) 1.92 (2) 0.4 ( 3-8 ) 1 × 10 − 26 (9) mm hr −1 THETAINI Initial soil moisture content 38.0 (1) 35 .6 ( 2-3 ) 29....

Ngày tải lên: 12/08/2014, 00:22

... on the size and spacing of the drains (van der Ploeg et al. 1999). Models described in the following chapters simulate tile drain flow in a variety of ways, including the Richards equation linked with ... LLC 96 Modeling Phosphorus in the Environment to simulate P loading to streams from base flow or tile flow (Neitsch et al. 2002a); however, this may lack continuity with...

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... Novak et al. 2003). Phosphorus 124 Modeling Phosphorus in the Environment The concept of sediment EPC 0 might provide a useful mechanism to simulate in- stream processes in these watershed models. ... watershed following RCWP land treatment. Pp. 47–58 in The National Rural Clean Water Program sym- posium, U.S. Environmental Protection Agency, EPA -6 2 5-R-9 2-0 06, Offi...

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... ivermectin in plasma and feces fol- lowing treatment of cows with ivermectin sustained-release, pour-on or injectable formulations. Intl J Parasitol 26( 10):1087–1093. Hollis JM. 1991. Mapping the ... MEDICINE IN SOIL From the above, it is clear that the exposure of the environment to a veterinary medicinal product is determined by a range of factors and processes. When assess...

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... working on a modeling approach to BMP evaluation (see Chapter 15 on BMPs in this book; Gitau et al. 2001). An initial step in modeling BMP-induced reduction in P loss is the characterization of the ... Sobecki. 2000. The National Phosphorus Project: interfacing agricultural and environmental phosphorus management in the U.S. Pp. 1 56 165 in International Conference...

Ngày tải lên: 12/08/2014, 00:21

... LLC 44 Modeling Phosphorus in the Environment field (drainage) boundary to the outlet of the field. This length and difference in elevation from the most remote point to the outlet are the same ... agricul- tural lands. U.S. Environmental Protection Agency, EPA 60 0/ 2-7 -7 6- 0 43, Environ- mental Research Laboratory, Athens, GA. Donigian, A.S., Jr., and N.H. Crawfo...

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... active active/stable 4 0 < = mineral P P 1 4 eqP active st β () −mineral P mineral P aable () if 4 stable mineral P > mmineral P active © 2007 by Taylor & Francis Group, LLC 166 Modeling Phosphorus in the Environment FIGURE ... LLC 178 Modeling Phosphorus in the Environment Green-Ampt in ltration equation, an improved weather generator, the ability to read i...

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... 194 Modeling Phosphorus in the Environment 0.1; D: 0.01 to 0.05); default is 0. 16 in. hr −1 ; suggests that Z *INFILT* INTFN should approximate the long-term in ltration rate, or permeability, in ... was delineated into FIGURE 8.4 Upper Etowah River basin with the solid dot indicating the watershed outlet at Canton, Georgia. The gray lines indicate the stream network...

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... (g/ha) Oct- 96 Mar-97 Sep-97 Mar-98 Sep-98 Mar-99 Sep-99 Mar-00 Sep-00 Time (months) 1200 1000 800 60 0 400 200 0 Observed Predicted Total P loss (g/ha) Oct- 96 Mar-97 Sep-97 Mar-98 Sep-98 Mar-99 Sep-99 ... change in the input leads to a 1% relative change in the output. A negative value indicates that input and output are inversely related. The greater the absolute value of t...

Ngày tải lên: 12/08/2014, 00:22

... Nomini Creek watershed for the May 26, 1989, storm. Negative values indicate a net loss, whereas positive values refer to a net gain of sediments. sed_loss Value -8 35 - -7 50 -7 50 - -6 0 0 -6 00 - -4 50 -4 50 ... runoff for the May 26, 1989, rainfall event for the Nomini Creek watershed. The dashed line represents the PO 4 -P losses occurring during the...

Ngày tải lên: 12/08/2014, 00:22