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Evaluation of a commercial grape yield monitor for use mid-season and at-harvest

Lookup NU author(s): Dr James Taylor



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Aims: Yield monitors are becoming more common in North America. This research evaluates the precision and accuracy of a retro-fitted, commercially available grape yield monitor mid-season, for crop estimation and crop thinning applications, and at harvest for yield mapping. Methods and Results: Several grape yield monitors were mounted on the discharge conveyor belt of grape harvesters in both commercial and research vineyards in North America. Sensor response was compared to manual measurements at multiple masses, ranging from 20 kg to 28 Mg over the course of three seasons. Measurements were taken during crop thinning and estimation (mid-season) and at harvest. Results showed that the grape yield monitor performance was sufficient to generate good spatial maps of the relative variation in harvest yield and mid-season thinned yield. However, at harvest the sensor showed a shift in response between days of up to ±15%, such that the generation of absolute yield maps required a daily calibration against a known mass. Within a day (single harvest operation) the sensor response did not appear to drift. Mid-season applications required a different calibration to harvest applications. Conclusion: The yield sensor worked well for both mid-season and at harvest operations in North American vineyards but required a daily calibration to avoid drift issues. The mid-season yield calibrations were different between seasons; however, the harvest calibration factor was stable between seasons. Significance and Impact of study: The study showed that a commercial yield monitor with correct calibration was effective at even low fruit flow. This opens the possibility of using a harvest sensor mid-season to mechanically estimate fruit load from small point samples and to map the amount of fruit removed during fruit thinning operations. This will improve the quality of information available to viticulturist to understand fruit and crop load. The commercial yield monitor is suitable for use in North American vineyards. Normal 0 false false false FR ZH-CN X-NONE

Publication metadata

Author(s): Taylor JA, Sanchez L, Sams B, Haggerty LL, Jakubowski R, Djafour S, Bates TR

Publication type: Article

Publication status: Published

Journal: Journal International des Sciences de la Vigne et du Vin

Year: 2016

Volume: 50

Issue: 2

Pages: 57-63

Online publication date: 27/07/2016

Acceptance date: 10/06/2016

Date deposited: 03/06/2016

ISSN (electronic): 2494-1271

Publisher: Institut des Sciences de la Vigne et du Vin – ISVV


DOI: 10.20870/oeno-one.2016.50.2.784


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