Nitrogen management, remote sensing, site-specific management, animal manure management, and soil fertility
Major Project Activities:
Current research activities focus on developing remote sensing techniques to detect crop stresses. Activities in other unit projects include the development and evaluation of site-specific nutrient management practices and evaluating the impact stover removal for biofuel production has on soil processes and plant growth.
Hong, S., J.S. Schepers, D.D. Francis, and M.R. Schlemmer. 2007. Comparison of ground-based remote sensors for evaluation of corn biomass affected by nitrogen stress. Comm. Soil Sci. Plant Anal. 31:1-18. http://hdl.handle.net/10113/5866
Stamatiadis, S., C. Christofides, C. Tsadilas, V. Samaras, J. Schepers, and D. Francis, 2005. Ground-sensor soil reflectance as related to soil properties and crop response in a cotton field. Prec. Ag. 6:399-411
Schlemmer, M.S., D.D. Francis, J.F, Shanahan, J.S. Schepers. 2005. Remotely measuring chlorophyll content in corn leaves with differing N and relative water content. Agron. J. 97:106-112. http://hdl.handle.net/10113/3774
Martin, K.L., P.J. Hodgen, K.W. Freeman, Ricardo Melchiori, D.B. Arnall, R.K. Teal, R.W. Mullen, K. Desta, S.B. Phillips, J.B. Solie, M.L. Stone, Octavio Caviglia, Fernando Solari, Agustin Bianchini, D.D. Francis, J.S. Schepers, J. L. Hatfield, and W.R. Raun. 2005.Plant-to-Plant Variability in Corn Production. Agron. J. 97:1603-1611
Akhtar, M., D.L. McCallister, D.D. Francis, and J.S. Schepers. 2005. Manure source effects on soil phosphorus fractions and their distribution. Soil Sci. 170: 183-190.
Osborne, S.L., J.S. Schepers, D.D. Francis, and M.R. Schlemmer. 2002b. Detection of phosphorus and nitrogen deficiencies in corn using spectral radiance measurements. Agron. J. 94:1215-1221. http://hdl.handle.net/10113/11451
Osborne, S.L., J.S. Schepers, D.D. Francis, and M.R. Schlemmer. 2002a. Use of spectral radiance to estimate in-season biomass and grain yield in nitrogen and water stressed corn. Crop Sci. 42:165-171. http://hdl.handle.net/10113/11711
Shanahan, J.F., J.S. Schepers, D.D. Francis, G.E. Varvel, W.W. Wilhelm, J.M. Tringe, M.R. Schlemmer, and D.J. Major. 2001. Use of remote-sensing imagery to estimate corn grain yield. Agron. J. 93:583-589. http://hdl.handle.net/10113/17169
Masek, T.J.,Schepers, J.S., Mason, S.C., and Francis, D.D. 2001. Use of precision farming to improve applications of feedlot waste to increase nutrient use efficiency and protect water quality. Comm. Soil Sci. Plant Anal. 32 (7&8), 1355-1369. http://hdl.handle.net/10113/16757
Varvel. G.E., Schepers, J.S., and Francis, D.D. 1997. Ability for in-season correction of nitrogen deficiency using chlorophyll meters. Soil Sci. Soc. of Am. J. 61:1233-1239. http://hdl.handle.net/10113/17640
Varvel. G.E., Schepers, J.S., and Francis, D.D. 1997. Chlorophyll meter readings and stalk nitrate techniques as complementary nitrogen indices for residual nitrogen. J. Prod. Agric. 10:147-151. http://hdl.handle.net/10113/17408
Francis, D.D., Schepers, J.S., and Sims, A.L. 1997. Ammonia exchange from corn foliage during reproductive growth. Agron. J. 89:941-946. http://hdl.handle.net/10113/17163
Francis, D.D. and J.S. Schepers. 1994. Nitrogen uptake efficiency in maize production using irrigation water high in nitrate. Fert. Res. 39:239-244.
Francis, D.D., Doran, J.W., Lohry, R.D. 1994. Nitrification inhibitor in fluid starters improves corn N uptake. Fluid J. Vol. 2, No. 4:22-23.
Francis, D.D., Schepers, J.S., and Vigil, M.F. 1993. Post-anthesis nitrogen loss from corn. Agron. J. 85:659-663. http://hdl.handle.net/10113/17158
Francis, D.D., Doran, J.W., and Lohry, R.D. 1993. Immobilization and crop uptake of ammonium and nitrate nitrogen applied to corn as starter fertilizer. Soil Sci. Soc. of Am. J. 57:1023-1026. http://hdl.handle.net/10113/17157
Schepers, J.S., Francis, D.D., Vigil M.F., and Below, F.E. 1992. Comparison of corn leaf nitrogen concentration and chlorphyll meter readings. Comm. Soil Sci & Plant Anal. Vol. 23, No. 17-20, 2173-2187. http://hdl.handle.net/10113/17155
Francis, D.D. 1992. An analysis of possible Control Mechanisms to reduce fertilizer nitrogen movement into ground water. J. of Soil and Water Cons. 47:444-448.
Aulakh, M.S., Doran, J.W., Walters, D.T., Mosier, A.R., and Francis, D.D. 1991. Crop residue type and placement effects on denitrification and mineralization. Soil Sci. Soc. Am. J. 55:1020-1025.
Schepers, J.S., Francis, D.D., Ferguson, R.B., and Lohry, R.D. 1990. Comparison of early season stem nitrate and leaf total N concentrations across corn hybrids. Comm. Soil Sci. and Plant Anal. 21:1381-1390.