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United States Department of Agriculture

Agricultural Research Service

Research Project: INTEGRATED MANAGEMENT OF LAND AND WATER RESOURCES FOR ENVIRONMENTAL AND ECONOMIC SUSTAINABILITY IN THE NORTHEAST U.S.

Location: Pasture Systems & Watershed Management Research

Title: Developing nitrogen recommendations for corn with an on-the-go canopy reflectance sensor

Authors
item Schmidt, John
item Dellinger, Adam - USDA-NRCS
item Beegle, Doug - PENN STATE UNIV

Submitted to: Proceedings of American Chemical Society National Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 4, 2008
Publication Date: August 20, 2008
Citation: Schmidt, J.P., Dellinger, A., Beegle, D. 2008. Developing nitrogen recommendations for corn with an on-the-go canopy reflectance sensor. Proceedings of American Chemical Society National Meeting. p. 115.

Interpretive Summary: An interpretive summary is not required.

Technical Abstract: Our objective was to compare the potential for developing N recommendations for corn based on crop reflectance with those developed from more traditional approaches. Corn yield response to N was determined for N applied at the 8-leaf growth stage. Crop reflectance (590 nm and 880 nm) was determined prior to sidedress N applications. Relative Green Normalized Difference Vegetation Index (RGNDVI) was determined, as GNDVI(0) / GNDVI(280), based on reflectance from corn receiving 280 kg per ha at planting. Traditionally used N recommendations deviated from EONR by: i) -68 to 126 kg per ha N when determined by a soil testing lab; ii) -49 to 162 kg per ha N when based on the Pre-Sidedress N test; and iii) -139 to 115 kg per ha N when based on a SPAD meter. Economic optimum N rate was strongly related to RGNDVI, which offers the potential to improve N recommendations for corn.

Last Modified: 8/31/2014
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