Search National Agricultural Library Digital Collections
Back to Search
NALDC Record Details:
Comparison of Ground-Based Remote Sensors for Evaluation of Corn Biomass Affected by Nitrogen Stress
The nondestructive determination of plant biomass is not possible; however, crop-canopy sensors that determine the normalized difference vegetation index have the potential to estimate living biomass, which is indicative of plant vigor and stress. Pot experiments using sand culture were conducted in 2002 and 2003 under greenhouse conditions to evaluate the effect of nitrogen (N) deficiency on corn biomass and reflectance. Stress was imposed by implementing six to eight levels of N in Hoagland's nutrient solution. Canopy reflectance measurements made at three growth stages with a variety of handheld spectral sensors (active and passive) were closely correlated with dry weight and chlorophyll meter readings of corn at flowering, as well as at the two earlier growth stages. Results indicate that selected ground-based sensors and related reflectance indexes can provide a nondestructive, real-time assessment of apparent plant N status and thus be used for in-season N-management decisions.
dry matter accumulation
Communications in soil science and plant analysis 2007, v. 38, no.15-16
Journal Articles, USDA Authors, Peer-Reviewed
Download [PDF File]
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Agricultural Research Service
Web Policies and Important Links