HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (15) Citing Articles via Google Scholar Google Scholar Articles by Scharf, P. C. Articles by Lory, J. A. Search for Related Content PubMed Articles by Scharf, P. C. Articles by Lory, J. A. Agricola Articles by Scharf, P. C. Articles by Lory, J. A. Related Collections Best Management Practices Nitrogen Maize Remote Sensing Nutrient Management Plant Nutrition Water Pollution Production Agriculture Maize Management

Calibrating Corn Color from Aerial Photographs to Predict Sidedress Nitrogen Need

Dep. of Agron., 210 Waters Hall, Univ. of Missouri, Columbia, MO 65211

View larger version (29K): [in a new window]   Fig. 1. Locations of on-farm small-plot N rate experiments in corn.

View larger version (79K): [in a new window]   Fig. 2. Close-up view of a single four-row plot showing an example of plant pixel selection in the center two rows.

View larger version (39K): [in a new window]   Fig. 3. Corn yield response to N rate and timing in 18 on-farm small-plot experiments. EONR, economic optimum N rate.

View larger version (16K): [in a new window]   Fig. 4. Relationship between corn color measured in aerial photographs and economic optimum N rate (EONR) at sidedress. Only data with zero N at planting are shown. The two best predictors of EONR among all color measurements tested were (a) green and (b) blue light radiance relative to high-N plots after removal of soil pixels from images. The circled data point is discussed in the text.