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Leaf-area estimates from spectral measurements over various planting dates of wheatSeveral vegetative indices were analyzed for their sensitivity and stability to green-leaf-area index (LAI) changes over various planting dates and irrigation frequencies of wheat grown at Phoenix, AZ, from 1978 to 1980. Seasonal patterns of greenness showed that values saturated at LAI values above 4.0 did not return to the pre-emergence bare-soil value at senescence, and were not uniquely related to LAI over the various planting dates. Regressions of individual MSS band reflectances against LAI also showed that there was not a unique relation between any of the bands and LAI. However, the near-infrared/red reflectance ratio was stable over all planting dates and could be used successfully over a number of years and locations.
Document ID
19850044786
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hatfield, J. L.
(U.S. Department of Agriculture, Agricultural Research Service, Lubbock, TX; California, University Davis, CA, United States)
Kanemasu, E. T.
(California Univ. Davis, CA, United States)
Asrar, G.
(Kansas State University of Agriculture and Applied Science, Manhattan, KS, United States)
Jackson, R. D.
(California Univ. Davis, CA, United States)
Pinter, P. J., Jr.
(California Univ. Davis, CA, United States)
Reginato, R. J.
(California Univ. Davis, CA, United States)
Idso, S. B.
(U.S. Department of Agriculture, Water Conservation Laboratory, Phoenix AZ, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: International Journal of Remote Sensing
Volume: 6
ISSN: 0143-1161
Subject Category
Earth Resources And Remote Sensing
Accession Number
85A26937
Funding Number(s)
CONTRACT_GRANT: NAS9-16457
Distribution Limits
Public
Copyright
Other

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