Login
Toggle navigation
Home
ICPA
Conference
Abstract Management
Abstract Topic Groups
Author Instructions
Registration
Registration Information
16th ICPA - Conference Registration
Registrants Map
Hotel and Travel Information
Tour
Workshops
Sponsors
Become A Sponsor
16th ICPA Sponsors
Conference Program
General Outline
Oral Program
Awards
Proceedings
Leadership
ISPA Leadership
Officers
Past Presidents
Officer Responsibilities
Country Representatives
Election Candidates
Communities
Community Guidance
On-Farm Experimentation
Nitrogen
Latin America
Economics
African Association for Precision Agriculture
Membership
ISPA Member Benefits
Membership Form
Events
ISPA Events
ACPA
ACPA Proceedings
AfCPA
AfCPA Proceedings
CLAP
CLAP Proceedings
ECPA
ECPA Proceedings
ICPA
ISPA Webinars
OFE
AAPA
Latin American
Robotics and Automation Symposium
Event Overview
Registration
Program
Venue
Speakers
About ISPA
Newsletters
History
Jobs
Precision Ag Definition
Agriculture Course Database Submission
Publications
ICPA Proceedings
ECPA Proceedings
Contact Us
Members
Suggestion Form
Conference
Abstract Management
Abstract Topic Groups
Author Instructions
Registration
Registration Information
16th ICPA - Conference Registration
Registrants Map
Hotel and Travel Information
Tour
Workshops
Sponsors
Become A Sponsor
16th ICPA Sponsors
Conference Program
General Outline
Oral Program
Awards
Proceedings
Proceedings
Search
Authors
Topics
Years
Types
Find matching any:
Reset
Rydahl, P
» Add more authors
Add filter to result:
Authors
Rydahl, P
Jorgensen, R.N
Dyrmann, M
Jensen, N
Sorensen, M.D
Bojer, O.M
Andersen, P
Rydahl, P
Boejer, O
Torresen, K
Montull, J.M
Taberner, A
Bückmann, H
Verschwele, A
Rydahl, P
Boejer, O
Jensen, N
Hartmann, B
Jorgensen, R
Soerensen, M
Andersen, P
Paz, L
Nielsen, M.B
Topics
Precision Crop Protection
Decision Support Systems
Precision Crop Protection
Type
Oral
Year
2018
2022
Use of Active Crop Canopy Reflectance Sensor for Nitrogen Sugarcane Fertilization
L. R. Amaral, G. Portz, H. Rosa, J. Molin
University of São Paulo
Researches about the use of ground-based canopy reflectance sensors aiming the nitrogen management fertilization on variable-rate over the sugarcane crop have been conducted in São Paulo, Brazil since 2007. Sugarcane response to nitrogen is variable, making difficult the development of models to estimate its demands. In this context, optical sensing has a great potential to evaluate and intervene in-season crop nutrition. Part of these studies is based at the CropCircle optical sensor (model ACS-210) and experiments have been conducted on plots set over in distinct growing conditions and nitrogen rates. The evaluations with the sensor are made according to the crop height. The relationship between yield and the vegetation indexes
NDVI and CI were analyzed, in addition to the chlorophyll content (Minolta SPAD). Due to the variability of situations where sugarcane is cultivated, it was proposed the comparison of a specific algorithm for each situation ("N ramp") and a general algorithm ("N-rich strip"), aiming variable-rate nitrogen recommendation. The ideal moment to perform measurements with the optical sensor is when the crop is between 0.4 to 0.7 m height, before that there is not enough biomass, and after that, the sensor signal begins to saturate. During this moment, vegetation indexes showed high correlation with the nitrogen applied and the final yield, while for the chlorophyll content it did not happen all the time. The specific methodology showed contradictory results, assigning nitrogen in excess at fields that did not responded to this nutrient. The general methodology, working with relative values, was adequate, since a correct yield estimative is performed by producers to be introduced in the algorithm. The CropCircle optical sensor was efficient in determining sugarcane crop N needs, although several changes have to be undertaken on the methodologies of recommendation that have been studied for other crops around the world.
Keyword
: Crop canopy sensor, nitrogen recommendations, Proximal Sensing
L. R. Amaral
G. Portz
H. Rosa
J. Molin
Proximal Sensing in Precision Agriculture
Poster
2012
Download paper