NDLI: Intercepted photosynthetically active radiation in wheat canopies estimated by spectral reflectance. [phoenix, arizona]

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Intercepted photosynthetically active radiation in wheat canopies estimated by spectral reflectance. [phoenix, arizona]

Content Provider	NASA Technical Reports Server (NTRS)
Author	Asrar, G. Kanemasu, E. T. Hatfield, J. L.
Copyright Year	1982
Description	The interception of photosynthetically active radiation (PAR) was evaluated relative to greenness and normalized difference (MSS 7-5/7+5) for five planting dates of wheat for 1978-79 and 1979-80 in Phoenix. Intercepted PAR was calculated from a model driven by leaf area index and stage of growth. Linear relationships were found between greenness and normalized difference with a separate model representing growth and senescence of the crop. Normalized difference was a significantly better model and would be easier to apply than the empirically derived greenness parameter. For the leaf area growth portion of the season the model between PAR interception and normalized difference was the same over years, however, for the leaf senescence the models showed more variability due to the lack of data on measured interception in sparse canopies. Normalized difference could be used to estimate PAR interception directly for crop growth models.
File Size	10588638
Page Count	29
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840013859
Archival Resource Key	ark:/13960/t7wm63z02
Language	English
Publisher Date	1982-09-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Multispectral Band Scanners Earth Resources Program Vegetative Index Canopies Vegetation Soil Moisture Insolation Regression Analysis Spectral Reflectance Agristars Project Moisture Content Photosynthesis Wheat Leaf Area Index Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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