INVESTIGATION OF SUGAR CANE VIGOR WITH AERIAL PHOTOGRAPHY IN PUERTO RICO.
Abstract
Reduction in sugar cane yield was reflected in the photographic signature of four emulsions. Seven conditions contributing to low vigor were examined: Ratoon stunting disease, yellow aphid, lesser corn stalk borer, soil salinity, herbicide suppression, iron deficiency, and soil moisture deficit. In most of the conditions tested the two color emulsions were more informative than the black and white films. In all four films, reductions in vigor were more obvious than identity of the casual agent. Identification of the cause of low vigor (either a biological agent or a physiological condition) was difficult on aerial photography in these tests. As predicted, drought, yellow aphid infestation, and severe iron chlorosis were easily distinguished. Other conditions such as lesser corn stalk borer and RSD confirmed on the ground were not specific in their signatures on aerial film. The multispectral aspect of the four emulsions aided interpretation; that is, negative results on one film were useful in combination with positive signatures on other films.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1965
- Accession Number
- AD0624625
Entities
People
- Philip L. Johnson
Organizations
- Cold Regions Research and Engineering Laboratory