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Joe Mari Maja

Research Sensor Engineer
Research Scientist
Agricultural Sciences Department, Edisto Research and Education Center

Office: 64 Research Road, Blackville, SC 29
Phone: 803-284-3343
Vita: Download CV
Personal Website:


 Educational Background

Ph.D. Information Science
Tohoku University 2003

MEng Computer Engineering
University of San Carlos 1997

MSc Information Science
Tohoku University 2000

BSc Computer Engineering
University of San Carlos 1991


My main responsibility is to work with REC researchers and SC growers (peanuts, cotton, soybeans and other root crops) in developing new technology to address current problems and future potential problems. I have developed different technologies to optimize farm operations. Some of the technologies that are currently on the testing phase: Intelligent Farm Controller (iFc) – Small size controller that runs its own small operating system and can be configured using terminal program. This will be used as the main coordinator for the Intelligent Pivot System but can also be used for other automation project; Pups – a small board (smaller than SC driver’s license) that transmits data from three different sensors into another controller e.g. iFc or to a computer. This will be used as a part of the intelligent pivot system project; Intelligent Spray Controller (iSc) – Spray controller powered by iFc that can control individual nozzles using pulse width modulation at 10 Hz; Penetrometer Board – small-sized board that incorporates GPS, Load Cell, Potentiometer and a trigger into one platform and stream all gathered information through either wired, e.g., USB or wireless (future) through Bluetooth or Zigbee.

 Research Interests

My research objectives are:
(1) To develop new or improve existing sensors for precision agriculture;
(2) To develop new technology for South Carolina Farmers that will help optimized their farm operations;
(3) To identify new tools or methodology that will help spur the use of new technology for farmers.


Relationship of Soil Moisture and Reflected GPS Signal Strength. Advances in Remote Sensing. Privette III, C.V., Khalilian, A., Bridges, W., Katzberg, S., Torres, O., Han, Y.J., Maja, J.M. and Qiao, X.,5, 18-27, 2016

Using remote sensing to improve the management of stink bugs in cotton in South Carolina, Francis Reay-Jones, Jeremy Greene, Joe Mari Maja and Phil Bauer, XXV International Congress of Entomology, Orlando, FL, September 2016

Predicting cotton yield of small field plots in a cotton breeding program using UAV imagery data, Joe Mari J. Maja, Todd Campbell, Joao Camargo Neto, Philip Astillo, Proc. SPIE 9866, Autonomous Air and Ground Sensing Systems for Agricultural Optimization and Phenotyping, 98660C (May 17, 2016); doi: 10.1117/12.2228929

Development of a Sensing Device for Detecting Defoliation Conditions, P. Astillo, JM Maja, and J. Green, 13th International Conference on Precision Agriculture, Missouri, July 2016

Development of robust and vibration free impact-type sensors using MEMs technology. Maja, Joe Mari J, A. Khalilian, A. Jayakaran. ASABE Annual International Meeting 2015, New Orleans, 2015.

Comparison of Manual Inventory Counts to an Automated Approach Using an Unmanned Aerial System, Joe Mari Maja, Josué Nahún Leiva, James Robbin and Matthew Chappell, SNA Research Conference Vol. 60 2015

Evaluation of Deposition and Coverage by an Air-Assisted Sprayer and Two Air-Blast Sprayers in a Citrus Orchard. L.R. Khot, J.M. Maja, J.M. Campoy, C. Wellington, A. Al-Jumaili. Transactions of the ASABE 57(4):1007-1013, 2014.

Determining Machine Efficiency Parameters for a Citrus Canopy Shaker Using Yield Monitor Data. R. Shamshiri, R. Ehsani, J. M. Maja, F. M. Roka. Applied Engineering in Agriculture. Vol. 29(1): 33-41, 2013.

Huanglongbing (Citrus Greening) Detection Using Visible, Near Infrared and Thermal Imaging Techniques. Sankaran S, Maja JM, Buchanon S, Ehsani R. Sensors. 2013; 13(2):2117-2130.

Comparison of two aerial imaging platforms for identification of Huanglongbing-infected citrus trees. F. Garcia Ruiz, S. Sankaran, J.M. Maja, W.S. Lee, J. Rasmussen, R. Ehsani. Computers and Electronics in Agriculture 91(2013) 106-115.

Applications of nanomaterials in agricultural production and crop protection: A review. Lav R. Khot, Sindhuja Sankaran, Joe Mari Maja, Reza Ehsani, Edmund W. Schuster. Crop Protection, Volume 35, May 2012, Pages 64-70

Visible-near infrared spectroscopy for detection of Huanglongbing in citrus orchards, Sindhuja Sankaran, Ashish Mishra, Joe Mari Maja and Reza Ehsani, Elsevier Journal of Computers and Electronics in Agriculture. doi:10.1016/j.compag.2011.03.

Development of a Yield Monitoring System for Citrus Mechanical Harvesting Machine, Maja, JM. and Ehsani, R. Journal of Precision Agriculture. DOI 10.1007/s11119-009-9141-1. 2010.

Two approaches to realize real-time yield monitoring of citrus fruits, Grift, T., Ehsani, R., Maja, JM, and Zhong, D., Elsevier Journal of Computers and Electronics in Agriculture. 65. 186-191. 2009.

Study on the Development of Multi-Robot Systems for Farm Operations (Part I), Maja, JM, Bulanon, D., Patiluna, V., Journal of the Japanese Society of Agricultural Machineries, No. 46, March 2006

Affordable Multi-Rotor Remote Sensing Platform for Application in Precision Horticulture. R. Ehsani, S. Sankaran, J. M. Maja, J.C. Neto. 11 International Conference on Precision Agriculture, Indianapolis, Indiana, USA, July 15-18, 2012.

Young Leaf Detection for Spot Spray Treatment of Citrus Canopies to control Psyllids. P.A. Larbi, R. Ehsani, M. Salyani, J.M. Maja, A.R. Mishra. 11 International Conference on Precision Agriculture, Indianapolis, Indiana, USA, July 15-18, 2012.

A New Low-Cost Aerial Imagery Platform and Its Applications for Precision Horticulture. R. Ehsani and J.M. Maja. 2011 ASHS Annual Conference, Waikoloa, Hawaii, USA, September 2011.

Citrus canopy volume and yield estimation using photosynthetically active radiation (PAR) based mobile sensor system. Lav R. Khot, Reza Ehsani, Amanda Valentine, Joe Mari J. Maja. ASABE Annual International Meeting 2011, Kentucky, August 2011.

Tree counting and caliper measurement for open field nursery using image processing. Maja, JM, R. Ehsani, D. Sarasawat, J. Robbins. ASABE Annual International Meeting, Pittsburgh, June 2010.

Yield Monitoring System for Citrus Mechanical Harvester. Ujwala S Jadhav, Joe Mari Maja, Reza Ehsani. ASABE Annual International Meeting, Pittsburgh, June 2010.

Development of a spot sprayer for spraying young flush on citrus tree. Maja, JM, Salyani, M, Ehsani, R., Pilkey, J., and Colaco, A. ASABE Annual International Meeting, Reno, Nevada, June 2009

Spot spraying of citrus tree canopies for controlling psyllids. Maja, JM, Salyani, M, and Ehsani, R. Proc. Fla State Hort. Society 2009, June 2009.

A Yield Monitoring System for Citrus Mechanical Harvesting Machines, Maja, JM. and Ehsani, R. ASABE Annual International Meeting, Providence, Rhode Island, June 29-July 2, 2008

Development of a new load cell yield monitor for citrus, Maja, JM and Ehsani, R., ISHS 2008 Precision Ag Symposium, Orlando, FL, USA. January 6-9, 2008

Development of a Two Wheeled System for Farm Operations, Canete, LGS, Patiluna, V., Maja, JM, BioRobotics III International Conference, September 9-10, 2006

Development of an Obstacle Detection System Using Off the- shelf and Low cost Ultrasonic Proximity Sensors for Off-road Vehicles, Patiluna, V., Canete, LGS., Maja, JM, BioRobotics III International Conference, September 9-10, 2006, Hokkaido, Japan.

ODV for Indoor Environment: Tool for Minimizing the Non-Holonomic Constraint Problem for Outdoor Vehicle, Maja, JM and Patiluna, V., Automation Technology for Off-road Equipment 2004, Oct. 7-8, 2004, pp. 149-154,Kyoto, Japan

PicEm: Tools for building computational devices, Patiluna, V., Bersonda, BL., Palima, J., Maja, JM, International Conference on Engineering Education, July 2004, Philippines

Obstacle-free Path Localization with Wavelet Transform, Maja J.M., Takayuki T., Shoji M., Nakano E., Society of Instrument and Control Engineers (SICE) 195th Research Meeting, Hachi no He Technical University, June 22, 2001

Motion Control of a Three-wheeled omni-directional Mobile Robot, Maja, JM, Atillo, C., Gicum, M., Navarete, J., 8th World Multi-Conference on Systemic, Cybernetics and Informatics (SCI), July, 2004, USA

Vision-based Map Building for Indoor Environment (Part I), Maja, J.M., Shoji, M., Nakano, E., The 6th World Multi-Conference on Systemic, Cybernetics, and Informatics (SCI), July 14-18, 2002, Orlando, Florida, USA

Real-time Obstacle Avoidance Algorithm for Visual Navigation, Maja, JM, Takahashi, T., Wang, Z.D., Nakano, E., Intelligent Robots and Systems (IROS) 2000, pp. 925-930, Oct. 31 - Nov. 5, 2000, Takamatsu, JAPAN


Intelligent Agritronix Devices
Edisto REC Website
My APT Link