The purpose of this experiment was to investigate the effects of a non-systematic fungus disease, southern corn leaf blight (Helminthosporium maydis), on the multispectral reflectance and radiant temperature of corn. Southern corn leaf blight is an example of a non-systematic fungus disease capable of significantly reducing the photosynthesis capacity of corn. The specific objectives of the experiment were to determine the relationship of disease severity level to the spectral characteristics of corn. The factorial treatments included 2 Hybrids and 3 Leaf Blight Treatments (non, early and late inoculation). The early and late inoculation provided two different levels of disease severity at any given measurement date. The experiment was conducted using a randomized complete block design with two replications. After the disease became established (about July 1) measurements of reflectance and radiant temperatures were to be made with the Exotech 20C and PRT-5 sensors at weekly intervals until maturity. In addition to the standard agronomic characterization of the canopy the degree of infection (loss of green leaf area) was measured. Inclement weather in August and loss of one of the hybrids due to poor germination severely limited data collection on this experiment.
The test took place in 1979.
The supporting docs include a brief summary of used instruments, a wavelength table (Wavelength_ASCII.txt), reflectance note and reflectance tables (ReflectanceTable206.txt and ReflectanceTableMulti.txt), and file format description (ExperimentDataFormat3.txt). The format description file is in ASCII format in lines of 80 characters.
This research dataset is part the Field Research Data Library that consists of over 200,000 spectral observations of soils and vegetation that have been collected since 1972 till 1991 as part of the research focused on vegetation and soils at the Laboratory for Applications of Remote Sensing (LARS) located at the Purdue University.
Cite this work
Researchers should cite this work as follows:
- Location: Purdue Agronomy Farm, West Lafayette, IN
- County: Tippecanoe
- Latitude/Longitude: 0402813N 0865927W
- Illumination: Solar
- Spectrometer: Exotech 20C-SW
- Wavelength Range: 0.40-2.40 um
- Experiment Type: Crops - Soybeans