EVALUATION OF TWO CROP CANOPY SENSORS FOR NITROGEN RECOMMENDATIONS IN IRRIGATED MAIZE |
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| Authors: | Tim Shaver Raj Khosla Dwayne Westfall |
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| Institution: | 1. Department of Agronomy and Horticulture , University of Nebraska-Lincoln , North Platte , Nebraska , USA;2. Department of Soil and Crop Sciences , Colorado State University , Fort Collins , Colorado , USA |
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| Abstract: | Crop canopy sensors can provide valuable information about in-field nitrogen (N) variability in maize (Zea mays L.) and can serve as the basis for in-season N recommendations. However, few studies have been conducted to determine how the sensors compare. Therefore, a study was conducted using the two most prominent crop canopy sensors (NTech's GreenSeeker? red and Holland Scientific's Crop Circle? amber) to determine if the different sensors recommended different amounts of N at the V12 maize growth stage. Results show that each sensor recommended the same amount of N at the V12 growth stage (N recommendations by sensor were not significantly different). The N algorithms developed for each sensor also calculated unbiased N recommendations suggesting that the methodology of algorithm development was valid as was the estimate of required N at maize growth stage V12. Therefore, both crop canopy sensors performed equally in terms of N recommendations in this study. |
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| Keywords: | crop canopy sensors nitrogen management NDVI |
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