7 Planting Dates (May 16, 27, June 12, 18, July 7, 16 and 30) 2 Row Spacings (25 and 75 cm) 2 Cultivars (Amsoy, narrow canopy type and Williams, bushy type) 2 Soil Types (Chalmers, darker and Toronto, lighter)A split plot design with two replications was used. Spectral measurements, along with agronomic characterizations of the canopyies and surface soil, were made at approximately weekly intervals throughout the growing season.
The spectral reflectance measurements were made with a Landsat band radiometer (Exotech 100). Radiant temperatures and overhead color photographs of the canopies were obtained simultaneously with the reflectance measurements.
The major agronomic measurements of the plots included growth stage, percent soil cover, height, leaf area index, biomass, and surface soil moisture and condition. Grain yields were measured at harvest time.
----------------------------------------------------------------------
Factor Level
Code Description Code Description
----------------------------------------------------------------------
1: Planting Date 0: Bare soil
1: May 16, 1980
2: May 27,1980
3: June 12,1980
4: June 18,1980
5: July 7,1980
6: July 16,1980
7: July 30,1980
2: Row width 0: Bare soil
1: 25 cm
2: 75 cm
3: Cultivar 0: Bare soil
1: Amsoy 71
2: Williams
4: Soil 1: Chalmers silty clay loam -
"darker soil"
2: Toronto -
"lighter soil"
5: Block or Replication 1: First block
2: Second block
----------------------------------------------------------------------
Experiment parameter 10: Radiant temperature as measured by a precision radiation thermometer (PRT-5) obliquely viewing the top surface of the canopy in Celsius degrees.