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Field Measurement of Soil Surface Chemical Transport Properties for Comparison of Management Zones

^a Agronomy Dep., Iowa State Univ., Ames, IA 50011
^b International Water Management Inst., c/o ICRISAT, Patancheru, AP 502 324 India
^c Agronomy Dep., Iowa State Univ., Ames, IA 50011
^d National Soil Tilth Research Lab., Ames, IA 50011

View larger version (86K): [in this window] [in a new window]   Fig. 1. A dripper transect (left) and an individual dripper during measurement (right).

View larger version (187K): [in this window] [in a new window]   Fig. 2. Soil surface conditions for no-till (A) with and (B) without residue and for chisel plow (C) with and (D) without residue.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Examples of the Jaynes et al. (1995) approach for determining chemical transport parameters (R = relative resident concentration and t* = scaled time).

View larger version (20K): [in this window] [in a new window]   Fig. 4. Example breakthrough curves for the no-till nontrafficked transect. Dots represent measurements and lines represent fitted values.

View larger version (20K): [in this window] [in a new window]   Fig. 5. Example breakthrough curves for the no-till trafficked transect. Dots represent measurements and lines represent fitted values.

View larger version (19K): [in this window] [in a new window]   Fig. 6. Example breakthrough curves for the chisel plow nontrafficked transect. Dots represent measurements and lines represent fitted values.

View larger version (20K): [in this window] [in a new window]   Fig. 7. Example breakthrough curves for the chisel plow trafficked transect. Dots represent measurements and lines represent fitted values.