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Using a Digital Camera to Photography for making Replant Decisions Determine Survival of Cotton Seedlings and Early Expression of Bronze Wilt

Bobby J. Phipps, Andrea S. Phillips, and Bobby J. Tanner

ABSTRACT

Digital photography is a tool that can be used for making crop replant decisions quickly. Live tissue reflects more infrared light than dead tissue. This can be observed using infrared film with a yellow filter. The live tissue is red and the rest is a blue or a muted color. Replant decisions must be made quickly and infrared film can take as much as a week to be processed. Decisions need to be made quickly, so film development time is critical. A digital camera virtually eliminates all of the development time by allowing the photos to be processed in the field on a laptop computer. A photo that mimics an infrared photo can be seen within five minutes. With only three or less steps, changing hue and saturation each time, the photos can be modified to produce the desired result, which takes less than 5 minutes. The photos are then ready for interpetion so replant decisions can be made. The healthy tissue is a bright red. Plants that appear healthy to the eye can be observed in the photos to have a problem since they will not have a bright red color. This can be seen as much as a week before death of the plant. Diseased plants have a higher leaf temperature and will be a brighter red in the photos. This photography technique can be a valuable tool for producers, consultants, seed companies, extension personnel and chemical companies.





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Document last modified 04/27/04