NDLI: Growth and reflectance characteristics of winter wheat canopies

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Growth and reflectance characteristics of winter wheat canopies

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hinzman, L. D. Daughtry, C. S. T. Bauer, M. E.
Copyright Year	1984
Description	A valuable input to crop growth and yield models would be estimates of current crop condition. If multispectral reflectance indicates crop condition, then remote sensing may provide an additional tool for crop assessment. The effects of nitrogen fertilization on the spectral reflectance and agronomic characteristics of winter wheat (Triticum aestivum L.) were determined through field experiments. Spectral reflectance was measured during the 1979 and 1980 growing seasons with a spectroradiometer. Agronomic data included total leaf N concentration, leaf chlorophyll concentration, stage of development, leaf area index (LAI), plant moisture, and fresh and dry phytomass. Nitrogen deficiency caused increased visible, reduced near infrared, and increased middle infrared reflectance. These changes were related to lower levels of chlorophyll and reduced leaf area in the N-deficient plots. Green LAI, an important descriptor of wheat canopies, could be reliably estimated with multispectral data. The potential of remote sensing in distinguishing stressed from healthy crops is demonstrated. Evidence suggests multispectral imagery may be useful for monitoring crop condition.
File Size	1446041
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850011184
Archival Resource Key	ark:/13960/t46q6sq82
Language	English
Publisher Date	1984-11-14
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Earth Resources Program Canopies Vegetation Biomass Nitrogen Remote Sensing Spectral Reflectance Chlorophylls Fertilizers Satellite Imagery Spectroradiometers Crop Growth Annual Variations Ureas Agriculture Wheat 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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