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United States Department of Agriculture

Agricultural Research Service

Dr. Dennis Timlin
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Click here for Contact Info, Current Projects, and Recent Publications

Education:

1970-1974      B.A. Biology, SUNY at Buffalo, NY

1980-1981      Post graduate studies at Univ. of Tennessee, Knoxville, TN 

1981-1987      M.S. and PhD/Soils and Soil Physics. Cornell University, Ithaca, NY

Professional Experience:

2004-present Soil Scientist USDA-ARS, Crop Systems and Global Change Laboratory, Beltsville, MD.

2000-2004      Soil Scientist USDA-ARS, Alternate Crops and Systems Laboratory, Beltsville, MD.

1996-2000      Soil Scientist USDA-ARS, Remote Sensing and Modeling Laboratory, Beltsville, MD. 

1991-1997      Soil Scientist USDA-ARS, Systems Research Laboratory, Beltsville, MD.

1989-1991      Post-Doctoral Research Associate. USDA-ARS Water Quality Management Lab, Durant, OK

1987-1989      Post-Doctoral Research Associate with Utah State Univ and Senior Research Associate with Cornell University. Work location was in Nepal as a visiting scientist at the Institute of Agriculture and Animal Science and consultant in an irrigation management project.

1981-1987      Graduate Research Assistant. Dept. of Agronomy, Cornell University, Ithaca, NY

1974-1978      Peace Corps Volunteer - Nepal

1996-2002   Associate editor, Agronomy Journal. 

Research Interests:

The project I work in is titled "Mechanistic Process-Level Crop Simulation Models for Assessment of Agricultural Systems ," and I provide leadership for research directed toward understanding the fundamentals of physical and biological soil processes and their interaction over a range of scales, from the plant to the field. By training I am a soil physicist and a biologist which leads to my interest in biophysics. I am interested in how plants and their environment interact and how to quantify that interaction using mathematical relationships. I am interested in plant-soil relationships at both the plant and field scale. Much of my work is directed toward developing plant and soil simulation models that growers can use to assist in management decisions. Another aspect of my work is it study spatial relationships among soil and landscape properties such as soil texture and soil surface curvature, and crop growth and yield. I am interested in learning how one can use crop models and spatial statistics to better map soil hydraulic properties from sparse measurements.

Publications 1986-present.

Refereed

 

 

1.      Timlin, D.J., R.B. Bryant, V.A. Snyder, and R.J. Wagenet. 1986. Modeling corn grain yield in relation to soil erosion using a water budget approach. Soil Sci. Soc. Am. J. 50:718-723.

 

2.      Parlange, M.B., T.S. Steenhuis, D.J. Timlin, F. Stagnitti, and R.B. Bryant. 1989. Subsurface flow above a fragipan horizon. Soil Science. 148:77-85

 

3.      McIntyre, S,C, Naney, J.W., J.W. Cooper, and D.J. Timlin. 1991. Sediment deposition in a forested inland wetland with a steep-farmed watershed. J. Soil Water Conserv. 46(1):64-66

 

4.      Timlin, D.J., G.C. Heathman, and L.R. Ahuja. 1992. Solute leaching in crop row vs. interrow zones. Soil Sci. Soc. Am. J. 56:384-392

 

5.      Timlin, D.J., L.R. Ahuja and M.D. Ankeny. 1994. A comparison of three field methods to calculate apparent macropore conductivity. Soil Sci. Soc. Am. J. 58:278-284.

 

6.      Heathman, G.C., L.R. Ahuja, D.J. Timlin. 1994. Surface aggregates and macropore effects on chemical transport in soil under rainfall. Soil Sci. Soc. Am. J. 59:990-997.

 

7.      Timlin, D.J., L.R. Ahuja and M.D. Ankeny. 1994. A comparison of three field methods to calculate apparent macropore conductivity. Soil Sci. Soc. Am. J. 58:278-284.

 

8.      Heathman, G.C., L.R. Ahuja, D.J. Timlin. 1994. Surface aggregates and macropore effects on chemical transport in soil under rainfall. Soil Sci. Soc. Am. J. 59:990-997.

 

9.      Timlin, D. J. and Ya. Pachepsky. 1996. Comparison of three methods to obtain the apparent dielectric constant from time domain reflectometry wave traces. Sci. Soc. Am. J. 60:970-977

 

10.  Pachepsky, Y., D.J. Timlin, and G. Varallyay. 1996. Artificial neural networks to estimate soil water retention from readily available soil data. Soil Sci. Soc. Am. J. 60:727-733.

 

11.  Timlin, D.J., Ya. Pachepsky, and B. Acock. 1996. A design for a modular, generic soil simulator to interface with plant models. Agronomy J. 88:162-169.

 

12.  Timlin, D.J., Ya. Pachepsky, B. Acock, and F. Whisler. 1996. Indirect estimation of soil hydraulic properties to predict soybean yield using GLYCIM. Agric. Sys. 52:331-353.

 

13.  Pachepsky, Ya.  and D.J. Timlin. 1996. Infiltration into layered soil covered with a depositional seal. J. Agrophysics. 10:21-30

 

14.  Timlin, D.J. and Ya. Pachepsky. 1997. A modular soil and root process simulator. Ecological Modeling. 94:67-80.

 

15.  Timlin, D. J. L.R. Ahuja, and G.C. Heathman. 1998. Preferential transport of a bromide tracer applied in a pulse of ponded water. J. Env. Qual.  27:505‑514    

 

16.  Timlin, D. J.,  Ya. Pachepsky, V. A. Snyder, and R.B. Bryant. 1998. Spatial and temporal variability of corn grain yield on a hill slope. Soil Sci. Soc. Am. J. 62:764‑773

 

17.  Pachepsky, Ya. and D. Timlin. 1998. Water transport in soils as a fractal media. J. of Hydr. 204:98‑107.

 

18.  Pachepsky, Ya. And D. Timlin. 1998. Generating spatially correlated fields with a genetic algorithm. Computers and Geosciences 24(8):765‑769.

 

19.  Timlin, D.J. and  Ya. Pachepsky. 1998. Measurement of unsaturated soil hydraulic conductivities using a ceramic cup tensiometer. Soil Sci. 163(8):625‑635

 

20.  Timlin, D.J., L.R. Ahuja, Ya. Pachepsky, R.D. Williams, D. Gimenez, and W. Rawls. 1999. Use of Brooks‑Corey parameters to improve estimates of saturated hydraulic conductivity from effective porosity. Soil Sci. Soc. Am. J. 63:1086‑1092.

 

21.  Reddy, V.R., D.J. Timlin, Ya. Pachepsky. 1999. Quantitative description of plant density effects on branching and light interception in soybean. Biotronics 28:73‑85.

 

22.  Pachepsky, YA; Rawls, WJ; Timlin, DJ. 1999. The current status of pedotransfer functions: Their accuracy, reliability, and utility in field‑ and regional‑scale modeling. In: Assessment of Non‑point Source Pollution in the Vadose Zone, 108: 223‑234 1999.

 

23.  Pachepsky, Ya, D.J. Timlin, and L.R. Ahuja. 1999.  Estimating saturated hydraulic conductivity using soil retention data and neural networks. Soil Science. 164:552‑560

 

24.  Timlin, D.J., J.L. Starr, R.E. Cady, and T.J. Nicholson. 2000. Comparison of Estimated Ground‑Water Recharge Using Different Temporal Scales of Field Data. NUREG/CR‑6653, U.S. Nuclear Regulatory Commission, Washington, DC

 

25.  Pachepsky, Ya, W.J. Rawls, and D.J. Timlin. 2000. A one‑parameter relationship between unsaturated hydraulic conductivity and water retention. Soil Science. 165:911‑919.

 

26.  Timlin, D.J., Ya. Pachepsky, C.L. Walthall, and S.E. Loechel. 2001. The use of a water budget model and yield maps to characterize water availability in a landscape. Soil and Tillage 58:219‑231

 

27.  Timlin, D.J., Ya. Pachepsky, V. A. Snyder, and R. B. Bryant. 2001. Water budget approach to quantify corn grain yields under variable rooting depths. Soil Sci. Soc. Am. J. 65:1219-1226.

 

28.  Timlin, D.J., Ya Pachepsky, and V.R. Reddy. 2001. Soil water dynamics in row and interrow positions in soybean  (Glycine max L.) Plant and Soil 237(1): 25‑35.

 

29.  Pachepsky, Ya, D.J. Timlin, W.J. Rawls. 2001 Soil water retention as related to topographic variables. Soil Sci. Soc. of Am. J. 65:1787-1795.

 

30.  Walthall, C. L., T. J. Gish, C.S.T. Daughtry, W.P. Dulaney, K.J.S. Kung, G. McCarty, D. Timlin, J.T. Angier, P. Buss, P.R.  Houser. An innovative approach for locating and evaluating subsurface pathways for nitrogen loss.  The Scientific World. 1:223-229. 2001.

 

31.  Timlin, D.J., Ya. Pachepsky, B.A. Acock, J. Šimunek,  G. Flerchinger, and F. Whisler. Error analysis of soil temperature simulations using measured and estimated hourly weather data with 2DSOIL. Agric. Sys. 72:215-239. 2002

 

32.  Timlin, D.J. and Ya. Pachepsky. Infiltration Measurement Using a Vertical Time‑Domain Reflectometry Probe and a Reflection Simulation Model. Soil Sci. 167:1-8. 2002

 

33.  Pachepsky, Ya, D.J. Timlin, and W. Rawls. Generalized Richards' Equation to Simulate Water Transport in Soils. J. Hydrol. 272:3-13. 2003

 

34.  Kim, S.H., V.R. Reddy, J.T. Baker, D. Gitz, and D. Timlin. Quantification of photosynthetically active radiation inside sunlit growth chambers.  Agric. Forest Meteorology 126(2):117-119. 2004

 

35.  Baker, J.T., S.‑H. Kim, D.C. Gitz, D. Timlin, and V.R. Reddy. A method for estimating carbon dioxide leakage rates in controlled‑environment chambers using nitrous oxide. Env. and Exp. Botany 51:103‑110. 2004

 

36.  Starr, J.L, and D. J. Timlin. Using High‑Resolution Soil Moisture Data to Assess Soil Water Dynamics in the Vadose Zone.  Vadose Zone J. 3: 926-935. 2004.  

 

37.  Taylor, J.E., T.G. Bellarmine, D. Timlin, V.R. Reddy.  Developing Appropriate Technology for Small-scale Farming Populations. Environmental Informatics Archives 2:10-14. 2004

 

38.  Baker, J.T., S-H. Kim,  D. C. Gitz, D. Timlin, V. R. Reddy. Photosynthesis and Yield of Southern U.S.A. Rice Cultivars in Response to CO2 and Temperature. J . Agric. Meteor.  60( 5).2005.

 

  39.  Bauerle, W.L., D. J. Timlin, Ya.  Pachepsky, and S. Anantharamu.  Adaptation of the Biological Simulation Model MAESTRA for Use in a Generic User Interface Agron. J. 98: 220-228. 2005.

 

40.  Ahuja, L.R., Ma, L. and Timlin, D.J.  Trans-disciplinary soil physics research critical to synthesis and modeling of agricultural systems.  Soil Sci. Soc. Am. J. 70:311-326. 2006.

 

41.  Timlin, D.J., Lutfor Rahman, S.M., Baker, J.T., Reddy, V.R., Fleisher, D. and Quebedeaux, B.  Whole Plant Photosynthesis, Development and Carbon Partitioning in Potato (Solanum tuberosum L.) as a Function of Temperature.  Agron. J. 98: 1195-1203. 2006.

 

42.  Fleisher, D.H., Shillito, R.M., Timlin, D.J., Kim, S‑H. and Reddy, V.  Approaches to Modeling Potato Leaf Appearance Rate. Agron. J. 98: 522-528. 2006.        

 

43.  Kim, S.-H., Sicher R.C.,  Bae H.,  Gitz,  D.C., Baker, J.T., Timlin, D.J. and  Reddy. V.R.  Canopy photosynthesis, evapotranspiration, leaf nitrogen, and transcription profiles of maize in response to CO2 enrichment.  Global Change Biol. 12:588-600. 2006.

 

44.  Fleisher, D.H., Timlin, D.J., and Reddy, V.  Temperature Influence on Potato Leaf and Branch Distribution and Canopy Photosynthetic Rate.  Agron. J. 98: 1442-1452. 2006.

 

45.  Fleisher, D.H. and Timlin, D.J.  Modeling Expansion of Individual Leaves in the Potato.  Canopy Agric. Forest Meteor. 139(84:93). 2006.

 

46.  Timlin, D.J., Fleisher, D.H., Kim, S-H., Reddy, V.R. and Baker, J.T.  Evapotranspiration measurement in controlled environment chambers: A comparison between time domain reflectometry and accumulation of condensate from cooling coils.   Agron. J. 99:166-173. 2007.

 

47.  Reddy, V., Yang, Y., Reddy, K., Timlin, D.J., Fleisher, D.H. Cotton Modeling for Climate Change, On-farm Decision Support, and Policy Decisions. International Congress on Modeling and Simulation Proceedings. 1:67-72. 2007.

 

48.  Kim, S.-H., Gitz, D.C., Sicher, R.C., Baker, J.T., Timlin, D.J., and Reddy, V.R. Temperature dependence of growth, development, and photosynthesis in maize under elevated CO2. Environmental and Experimental Botany. 61(3):224-236. 2007

 

49.  Walthall, C. L.; Pachepsky, Y.; Dulaney, W. P.; Timlin, D. J., and Daughtry, C. S. T. Exploitation of spatial information in high resolution digital imagery to map leaf area index. Precision Agriculture. 8(6):311-321. 2007.

 

50.  Reddy, V., Yang, Y., Reddy, K., Timlin, D.J., Fleisher, D.H.  Cotton Modeling for Climate Change, On-farm Decision Support, and Policy Decisions. International Congress on Modeling and Simulation Proceedings. 1:67-72. 2007.

 

51.  Timlin, D. J., M. Kouznetsov, D. H. Fleisher, S-H. Kim, and V. R. Reddy. Simulation of nitrogen demand and uptake in potato using a carbon-assimilation approach. p. 219-243. In: L. Ma, L. R. Ahuja, and T. Bruulsema (eds.) Quantifying and Understanding Plant Nitrogen Uptake for Systems Modeling. CRC Press, FL. 2008.

 

52.  Fleisher, D., Timlin, D., and V.R. Reddy. Elevated Carbon Dioxide and Water Stress Effects on Potato Canopy Gas Exchange, Water Use, and Productivity. Agric. Forest Met. 148(6/7):1109-1122. 2008.

 

53.  Shillito, R.M., D.J Timlin, D.H. Fleisher, V.R. Reddy and B. Quebedeaux. Spatial Yield Response of Potato:  Assessing Nitrogen Fertilizer Application. Agriculture, Ecosystems and Environment, 129:107:116. 2009.

  

54.  Fleisher, David H., Timlin, D. J., Reddy, Vangimalla R. 2008. Interactive Effects of Carbon Dioxide and Water Stress on Potato Canopy Growth and Development. Agron. J.  100: 711-719.

 

55.  Yang, Y., Kim, S-H, Timlin, D. J., Fleisher, D.H, Quebedeaux, B., and Reddy, V. R. Simulating Canopy Evapotranspiration and Photosynthesis of Corn Plants Under Different Water Status Using a Coupled MaizeSim+2DSOIL Model. Trans ASAEB. 52(3):1011-1024. 2009

 

56.  Starr, J.L., D.J. Timlin, D.J., Downey, P.M, and McCann, I.R. Laboratory Evaluation of Dual-Frequency Multisensor Capacitance Probes to Monitor Soil Water and Salinity. Irrigation Science 27:393–400. 2009

 

57.  Alva, A., J. Marcos, C. Stockle, V.R. Reddy, and D. Timlin. A Crop Simulation Model for Prediction of Yield and Fate of Nitrogen in Irrigated Potato Rotation Cropping System. Journal of Crop Improvement. 2009 (Accepted Feb. 19, 2008).

 

58.  Timlin, D, Y. Yang, S-H Kim, J. Bunce, S. Anapalli, D. Fleisher, B. Quebedeax V.R. Reddy.  Simulation of the effects of limited water on photosynthesis and transpiration in field crops: Can we advance our modeling approaches? In L.R. Ahuja, V.R. Reddy, S.A. Saseendran, & Qiang Yu (Eds.), Response of Crops to Limited Water: Understanding and Modeling Water Stress Effects on Plant Growth Processes: Vol. 1. Advances in Agricultural Systems Modeling, (pp 105-143). Madison, WI. American Society of Agronomy. 2009

 

59.  Anapalli S.S, Ahuja, L.R., Ma, L., Timlin, D.J., Stockle C.O., Boote K. J. 2009. Current Water Deficit Stress Simulations in Selected Agricultural System Simulation Models. In L.R. Ahuja, V.R. Reddy, S.A. Saseendran, & Qiang Yu (Eds.), Response of Crops to Limited Water: Understanding and Modeling Water Stress Effects on Plant Growth Processes: Vol. 1. Advances in Agricultural Systems Modeling, (pp 1-38). Madison, WI. American Society of Agronomy. 2009

 

60.  Yang, Y., Ling, P.P., Fleisher, D.H., Timlin, D.J., Reddy, V. Non-contacting techniques for plant drought stress detection. Transactions of the ASABE. 51(4):1483-1492. 2008

 

61.  Nemes, A. D.  Timlin, D. Y. Pachapsky, and W. Rawls. Revision of the Rawls et al. (1982)  Pedotransfer functions for their applicability  to US croplands. Soil Science Society of America J. 73:1638-1645. 2009.

 

62.  Yang,Y., D. Timlin, D. Fleisher, S.H.Kim, Soo-Hyung, B. Quebedeaux, and V.R. Reddy. Simulating leaf area of corn plants at contrasting water status. Ag.  Forest Met. 149:1161-1167. 2009

 

64.  Fleisher, D.H., Timlin, D.J., Yang, Y., Reddy, V.R. and Reddy, G.K. 2009. Uniformity Between and Within Soil-Plant-Atmosphere-Research Chambers. Trans. ASAEB. 52(5):1-11. 2009.

 

65.   Alva, A., J. Marcos, C. Stockle, V.R. Reddy, and D. Timlin. A Crop Simulation Model for Prediction of Yield and Fate of Nitrogen in Irrigated Potato Rotation Cropping System. Journal of Crop Improvement. 24:142-152. 2010.

 

66.   Fleisher, D.H., D.J. Timlin, Y. Yang, and V.R. Reddy. Simulation of potato gas exchange rates using SPUDSIM. Agric. and Forest Met. 150:432-442. 2010.

 

67.   Chun, Jong A., Cooke, Richard A., Kang, Moon S., Choi, Minha, Timlin, Dennis, and Park, Seung W.  Runoff Losses of Suspended Sediment, Nitrogen, and Phosphorus from a Small Watershed in Korea. Journal of Environmental Quality. 39:981-990. 2010

 

68.   Alva, A., J. Marcos, C. Stockle, V.R. Reddy, and D. Timlin. A Crop Simulation Model for Prediction of Yield and Fate of Nitrogen in Irrigated Potato Rotation Cropping System. Journal of Crop Improvement. 24:142-152. 2010.

 

69. Ephrath, J.E., D. J. Timlin, V.R. Reddy, and J. Baker. Irrigation and Elevated Carbon Dioxide Effects on Whole Canopy Photosynthesis and Water Use in Cotton (Gossypium hirsutum L.). Plant Biosystems. 145:201-215. 2011

 

70.    Nemes, A., Quebedeaux, B., Timlin, D. Ensemble Approach to Provide Uncertainty Estimates of Soil Bulk Density. Soil Sci. Soc. Am. J. 74:1938-1945., 2010.

 

71.      Fleisher, D.H., Timlin, D.J., Yang, Y., Reddy, V.R. Effects of Potato Stem Density on Canopy Development and Production. Potato Research Potato Research, 54: 137-155. 2011.

 

72.      Nemes, A. Pachepsky, Y. Timlin, D. Toward improving global estimates of field soil water capacity. Soil Sci. Soc. Am. J. 75(3):807-812. 2011.

 

73.      Chun, J.A., Wang, Q., Timlin, D., Fleisher, D., Reddy, V.R. Effect of elevated carbon dioxide and water stress on gas exchange and water use efficiency in corn. Agricultural and Forest Meteorology 151(3):378-384. 2011

 

74.      Yang, Y., Timlin, D.J., Fleisher, D.H., Reddy, V.R. , Lokhande, S., Chun, J.A., Kim, S.-H. Staver, K. Nitrogen concentration & dry matter accumulation in maize crop: Assessing maize nitrogen status with an allometric function and a chlorophyll meter. Soil Science and Plant Analysis 43:1563-1575. 2012

 

75.      Fleisher, D.H., Wang, Q., Timlin, D.J., Chun, J.A. and Reddy, V.R. Effects of carbon dioxide and phosphorus supply on potato dry matter allocation and canopy morphology. J. Plant Nutrition. (in press).

 

76.      Wang, Q., Fleisher, D.H., Reddy, V.R., Timlin, D.J. and Chun, J.A. Quantifying the measurement errors in a portable open gas-exchange system and their effects on the parameterization of Farquhar et al. model for C3 leaves. Photosynthetica. 50(2):223-238. 2012

 

77.      Kim, S-K, Y. Yang, D.J. Timlin, D. Fleisher, A. Dathe, V.R. Reddy. Modeling Nonlinear Temperature Responses of Leaf Growth, Development, and Biomass in MAIZSIM. Agron. J.  104:1523-1537. 2012

 

78.      Sicher, R., Timlin, D., and Bailey, B. Responses of growth and primary metabolism of water-stressed barley roots to rehydration. J. Plant Phys. 169:686-695. 2012

 

79.  Fleisher, D., Wang, Q., Timlin, D., Chun, J., Reddy, V.  Response of potato gas exchange and productivity to phosphorus deficiency and carbon dioxide enrichment. Crop Science. 52:1803-1815. 2012

 

80.  Resop, J., Fleisher, D., Wang, Q., Timlin, D., Reddy, V. Combining explanatory crop models with geospatial data for regional analyses using multiple-scale aggregation. Computers in Agriculture. 2012 (accepted).

 

81.  Sicher, R.C., Timlin, D., Bailey, B. Characteristics of assimilates in soybean spices that respond to atmospheric carbon dioxide enrichment. Journal of Plant Biochemistry and Biotechnology. 2012 (in review).

 

 

82.  Timlin, D.J., Fleisher, D., Kim, S-H, Reddy, V.R. Canopy Level Carbon Assimilation in Potato (Solanum Tuberosum, L) Under Varying Carbon Dioxide and Nitrogen (in review)

 

 

 

 

Other Publications

1.  Timlin, D. J. 1986. Modeling the relationship between soil erosion and soil productivity using a water budget approach. Cornell Univ. Library. (M.S. Thesis)

 

2.  Timlin, D.J. 1987. Evaluating the effect of soil erosion on soil productivity through simulation modeling and geostatistical analysis. Cornell Univ. Library. (PhD Dissertation)

 

3.  Timlin, D.J., R. B. Bryant, V. A. Snyder, and D. J. Miller. 1987. Corn yield-soil erosion relationships for selected Northeast soils. Final project report submitted to the Soil Conservation Service in reference to cooperative agreement No. 58-2C31-3-170.

 

4.  Timlin, D.J., S. K. Shrestha, G. Bhatta, and P. K. Shrestha. 1988. Baseline study of the Sirsia and Dudhaura Irrigation Systems. The Irrigation Management Center, Ministry of Water Resources, Nepal. A report for the Irrigation Management Project for USAID.

 

5.  Timlin, D.J., L.R. Ahuja, G.C. Heathman. 1993. Preferential transport of a non-adsorbed solute: Field measurements. p 386-387 In Agricultural Research to Protect Water Quality, Minneapolis, MN, 21-24 February, 1993. Soil and Water Conservation Soc.

 

7.  Pachepsky, Ya., B. Acock, H. Lemmon, D. Timlin, A. Trent. 1993. 2DSOIL- A new soil-plant simulator to assess the influence of management practices on water quality. p 388-389 In Agricultural Research to Protect Water Quality, Minneapolis, MN, 21-24 February, 1993. Soil and Water Conservation Soc.

 

8.  Lemmon, H.E., N. Chuk, V. ,Reddy, B., Acock, Y. Pachepsky, D., Timlin, M. Van Venuchten, J, Simunek, T., Vogel. 1994. Sigma+ An advanced cotton management system. Proceedings of the Cotton Beltway Conference, Meeting held January 5?8. Pp. 589. ‑ conference proceedings.

 

9.  Reddy, V.R., B. Acock, and D. J. Timlin. 1995. Role of crop models in technology transfer and input optimization. In V.R. Reddy and T.Y. Reddy (ed.) Modular Crop Growth Models, Kalyani publishers, New Delhi, India.

 

10.  Timlin, D.J., Pachepsky. Ya,  Acock, B., Lemon, H. and Tent, A. 1995. 2DSOIL ‑ A Two‑Dimensional Modular Simulator of Soil and Root Processes. In: Proceedings of the 1995 Workshop on Computer Applications in Water Management. 23 to 25  May, 1995. Colorado Water Resources Research Institute Information Series No. 79. Pg 174‑178.

 

11.  Timlin, D.j., Ya. Pachepsky, And V.R. Reddy. 1996. Infiltration and water uptake in row and interrow positions in soybean (Glycine Max L.) p.335-343. In Proc. of the International Agricultural Engineering Conference, Pune, India, 9-12 December, 1996.

 

12.  Caldwell, R.M., Y. Pachepsky, and D. Timlin.  1996. Current research status on growth modeling in intercropping. Pg. 617-635. In O. Ito et al. (ed) Roots and Nitrogen in Cropping Systems of the semi-arid tropics.  Proceedings of the International Workshop: Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics. 21-25 Nov 1994. International Crops Research Institute of the Semi‑Arid Tropics, Patancheru, Andhra Pradesh, India.

 

13.  Timlin, D. J., R.D. Williams and L.R. Ahuja. 1996. Methods to estimate soil hydraulic parameters for regional-scale applications of mechanistic models. p.185-203. In D. Corwin and K. Loage (ed.) Applications of GIS to the modeling of non-point source pollutants in the vadose zone. ASA Special publication ASA, CSSA, and SSSA, Madison, WI.

 

14.  Timlin, D.J., Ya. Pachepsky, V.A. Snyder, and R.B. Bryant. 1998. Soil surface curvature and the spatial and temporal variability of corn grain yield on a hillslope. In P.C. Robert, R.H. Rust, and W.E. Larson (eds).  Precision Agriculture: Proceedings of the 4th International Conference.  Pp.203‑214.  St. Paul, Minnesota, July 19‑22.

 

15.  Timlin, D.J., L.R. Ahuja, Ya Pachepsky, R.D. Williams, D. Gimenez, and W. J. Rawls. Use of Brooks‑corey Pore Size Distribution Index to Improve Estimates of Saturated Conductivity from Effective Porosity. Characterization and Measurement of the hydraulic properties of unsaturated porous media. Univ. of Calif. Riverside. 1999. v. 2.  p 1029‑1036.

 

16.  Dulaney, W.P. , C.S.T. Daughtry, C.L. Walthall, D.J. Timlin,  T.J. Gish, and K.J.S.  Kung. 2000. Use of ground‑penetrating radar and remotely sensed data to understand yield variability under drought conditions.  In.  Proceedings of the 5th International Conference on Precision Agriculture, Bloomington, Minnesota, USA, 16‑19 July, 2000, 2000, publ. 2001, pp. 1‑12.

 

17.  Timlin, D.J., J.L. Starr, R.E. Cady, and T.J. Nicholson. 2000. Comparison of Estimated Ground‑Water Recharge Using Different Temporal Scales of Field Data. NUREG/CR‑6653, U.S. Nuclear Regulatory Commission, Washington, DC

 

18.  Walthall, C. L., Y. Pachepsky, W. P. Dulaney, D. J. Timlin, and C. S. T. Daughtry. 2001. Using spatial variance information from remotely sensed imagery to map crop foliage density. In: Proceedings of the Third International Conference on Geospatial Information in Ariculture and Forestry [CD-ROM Computer file], Denver, Colorado, 5 ‑7 November 2001. Veridian, Ann Arbor, MI, USA.

 

19.  Starr, J.L., and D.J. Timlin. 2001. Estimating Preferential Infiltration and Redistribution from Real‑time Measurements of Soil Water Content. P. 97‑100. In Preferential Flow ‑ Water Movement and Chemical Transport in The Environment. Proc. Int. Symp., 2nd, Honolulu, HA. 3‑5 Jan. 2001. ASAE, St. Joseph, MI.

 

20.  Timlin, D.J., Walthall, C. L., Y. Pachepsky, W. P. Dulaney, and C. S. T. Daughtry. 2001. Spatial Regression of Crop Parameters with Airborne Spectral Imagery In: Proceedings of the Third International Conference on Geospatial Information in Agriculture and Forestry [CD-ROM Computer file], Denver, Colorado, 5 ‑7 November 2001. Veridian, Ann Arbor, MI, USA

 

21.  Timlin, D.J., J.L. Starr. R. Cady, T.J. Nicholson. 2001. Field Studies for Estimating Uncertainties in Ground‑Water Recharge Using Near‑Continuous Piezometer Data.NUREG/CR‑6729, U.S. Nuclear Regulatory Commission, Washington, DC.

 

22.  Pachepsky, Ya., D. Benson, and D.J. Timlin. 2001. Transport of water and solutes in soil as in porous fractal media. p 51‑75. In H.M. Selim and D.L. Sparks (ed.) Physical and Chemical Processes of Water and Solute Transport/Retention in Soil. ASA Spec. Pub. 56. ASA, CSSA, and SSSA, Madison, WI.

 

23.  Timlin, D.J., Ya. Pachepsky, C. Walthall. 2003. A Mix of Scales: Topographic Information, Point Samples and Yield Maps, pg 227-241. In: Ya. Pachepsky, D. Radcliffe, and H.M. Selim Eds., Scaling Methods in Soil Physics. CRC Press, Boca Raton, FL

 

24.  Shillito, R.M., D.J. Timlin, D.H. Fleisher, V.R. Reddy, B. Quebedeaux. 2004.  Landscape‑scale agricultural experimentation:  spatial autocorrelation and potato yield.  p x ‑ x.  In D.J. Mulla, et al (ed.) Proc. of the 7th Intl. Conf. on Precision Agriculture.  ASA, CSSA, and SSSA, Madison, WI (in Press).

 

25.  Walthall, C.L., Dulaney, W.P., Anderson, M., Norman, J., Fang, H., Liang, S., Timlin, D., Pachepsky, L. 2004. Alternative Approaches for Estimating Leaf Area Index (LAI) from Remotely Sensed Satellite and Aircraft Imagery. In: Proceedings of the Spie International Symposium on Optical Science and Technology, August 2-6, 2004, Denver, Colorado. 5544: P. 241-255.

  

26.  Chinkuyu, A., A. Guber, T. Gish, D. Timlin, J. Starr, T. Nicholson, R. Cady,  A. Schwartzman.Field Studies to Confirm Uncertainty Estimates of Ground-Water Recharge. NUREG/CR 6946, U.S. Nuclear Regulatory Commission, Washington, DC. 2007

  

Software and Documentaton

1.  Snyder, K.S.,  D. J. Timlin, and R. B. Bryant. 1986. WATFOR: A soil water budget model in FORTRAN 77. Agronomy Mimeo 86-16. Dept. of Agronomy, Cornell University, Ithaca, NY.

2.  Pachepsky, Ya., D. Timlin, B. Acock, H. Lemmon, and A. Trent. 1991. 2DSOIL A new simulator of soil and root processes. (version 01), Systems Research Laboratory Publication #1, Beltsville, MD.

 

3.  Pachepsky, Ya., D. Timlin, B. Acock, H. Lemmon, and A. Trent. 1992. 2DSOIL A new simulator of soil and root processes. (version 02), Systems Research Laboratory Publication #2, Beltsville, MD.

4.  Timlin, D.J., Ya. Pachepsky, F.D. Whisler and V.R. Reddy. 2000. Automated parameter estimation for the soybean crop model GLYCIM. Remote Sensing and Modeling Lab Special Publication #11.

5.  Timlin, D.J. Ya. Pachepsky, and M.Th. van Genuchten. 2001. 2DSOIL, A modular simulator of soil and root processes. Ver 0.3. USDA-ARS Alternate Crops and Systems Laboratory Special Publication #1.

 


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