Mapping Alfalfa Yield Using an Energy Monitoring System on a Rectangular Hay Baler

Journal of Agricultural Machinery. 2015;5(1):199-205 DOI 10.22067/jam.v5i1.28930


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Journal Title: Journal of Agricultural Machinery

ISSN: 2228-6829 (Print); 2423-3943 (Online)

Publisher: Ferdowsi University of Mashhad

LCC Subject Category: Agriculture: Agriculture (General) | Technology: Engineering (General). Civil engineering (General)

Country of publisher: Iran, Islamic Republic of

Language of fulltext: Persian

Full-text formats available: PDF



H Hooshmand (Shiraz University)
M Loghavi (Shiraz University)


Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 25 weeks


Abstract | Full Text

The most advanced part of precision agriculture technology is yield monitoring of grain and non-grain crops. In this study, the horizontal pressing force of baling plunger and the angular position of the plunger connecting rod were simultaneously measured by installing a load cell and a shaft encoder on the connecting rod and plunger flywheel of a small rectangular baler, respectively. The signals of these sensors were processed in an electronic board and the output data were recorded on a portable computer for monitoring and further analysis. Before baling the harvested alfalfa from the test field, random samples were collected and weighted to obtain a referenced measure of the yield variation along the entire field. Comparing the yield data with the pressing energy and angular position data indicated a good correlation between the throughput rate of the baler and the horizontal force imparted on the baler plunger. The estimated crop yield variations were geo-referenced by using a GPS receiver. By combining the output data of the installed sensors and the positioning data, the yield map of the test field was prepared.