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http://dx.doi.org/10.5307/JBE.2010.35.2.132

Map-based Variable Rate Application of Nitrogen Using a Multi-Spectral Image Sensor  

Noh, Hyun-Kwon (Dept. of Biosystems Engineering, Chungbuk National University)
Zhang, Qin (Washington State Uinversity, Dept. of Biological Systems Eng)
Publication Information
Journal of Biosystems Engineering / v.35, no.2, 2010 , pp. 132-137 More about this Journal
Abstract
Site-specific N application for corn is one of the precision crop management. To implement the site-specific N application, various nitrogen stress sensing methods, including aerial image, tissue analysis, soil sampling analysis, and SPAD meter readings, have been used. Use of side-dressing, an efficient nitrogen application method than a uniform application in either late fall or early spring, relies mainly on the capability of nitrogen deficiency detection. This paper presents map-based variable rate nitrogen application based using a multi-spectral corn nitrogen deficiency(CND) sensor. This sensor assess the nitrogen stress by means of the estimated SPAD reading calculated from the corn leave reflectance. The estimated SPAD value from the CND sensor system and location information form DGPS of each field block was combined into the field map using a ArcView program. Then this map was converted into a raster file for a map-based variable rate application software. The relative SPAD (RSPAD = SPAD over reference SPAD) was investigated 2 weeks after the treatments. The results showed that the map-based variable rate application system was feasible.
Keywords
Precision crop management; Nitrogen deficiency; Multi-spectral image; SPAD; Reflectance; Map-based application;
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