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Title:   Author  item
                                            Daughtry, Craigitem
                                            Hunt Jr, Earleitem
                                            Doraiswamy, Paulitem
                                            McMurtrey Iii, Jamesitem
                                            Russ, Andrew

                                                         - *Andy*
  Submitted to: International Geoscience and Remote Sensing Symposium Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 6/15/2003
                                    Publication  Date: 7/20/2003
                                    Citation: Daughtry, C.S., Hunt, E.R., Doraiswamy, P.C., McMurtrey, J.E., Russ, A.L. 2003. Remote sensing of crop residue cover and soil tillage intensity.  In: Proceedings of 2003 International Geoscience and Remote Sensing Symposium, July 21-25, 2003, Toulouse, France. 2003 CDROM.Interpretive Summary:
                                Technical Abstract: Crop residues on the soil surface reduce soil erosion and affect water infiltration, evaporation, and soil temperatures. Crop residues also influence the flow of nutrients, carbon, water, and energy in agricultural ecosystems. Current methods of measuring crop residue cover are inadequate for monitoring large areas. One promising remote sensing approach for discriminating crop residues from soil is based on a broad absorption band near 2100 nm that appears in plant materials and is absent in most soils. The cellulose absorption index (CAI), which measured the relative depth of this absorption feature, was linearly related to crop residue cover. High-altitude AVIRIS data acquired on 11 May 2000 prior to spring crop planting at the Beltsville Agricultural Research Center in Maryland were analyzed. NDVI was calculated using bands centered at 827 nm and 646 nm and CAI was calculated using bands at 2031, 2101, and 2211 nm. Agricultural fields with low green vegetation cover (low NDVI) were classified into three tillage categories based on crop residue cover determined by CAI. Fields with >30% residue cover were classified as conservation tillage; those with 15-30% residue cover as reduced tillage; and those with <15% residue cover as intensive tillage. The tillage classification agreed with ground observations in corn harvested for grain and tilled fields. Soybean fields and mowed alfalfa fields had low residue cover even with no tillage. Thus, both residue cover and previous crop type are necessary to classify tillage intensity in agricultural fields.


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