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ARS Home » Research » Publications at this Location » Publication #108085
Title: MULTISPECTRAL REMOTE SENSING RELATED TO WATER AND NITROGEN USE IN COTTON

Author
item LI, H - TEXAS A&M UNIVERSITY
item LASCANO, R - TEXAS A&M UNIVERSITY
item BARNES, EDWARD
item WALLER, P - UNIVERSITY OF ARIZONA

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/31/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Site specific farm management requires frequent data on the spatial distribution of plant water and nitrogen status. A multispectral remote sensing study was conducted in a large irrigated cotton field on the semiarid South Texas High Plains beginning in the spring 1998 in order to relate plant/soil reflectance to water and N use. Near infrared reflectance increased and visible red reflectance decreased with increasing irrigation. Measured plant/soil spectral response was significantly affected by water input level and interaction between water and N inputs (P > 0.001). Generated maps with NDVI (normalized difference vegetative index) data showed that the crop N status was heterogeneously distributed. Water stress in plants, crop N status, lint yield, N uptake, and LAI (leaf area index) were strongly associated with topographic features based on analysis of covariance. Results suggest that plant spectral response could be used to quantify the impact of natural landscape variability on crop water and N status.