Use of ultrasonic transducers for on-line biomass estimation in winter wheat

S. Reusch

Use of ultrasonic transducers for on-line biomass estimation in winter wheat

In: Precision agriculture '09

Author:

S. Reusch

S. Reusch Yara International, Research Centre Hanninghof, 48249 Dülmen, Germany; stefan.reusch@yara.com

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Type:: Chapter

Pages:: 169–175

DOI:: https://doi.org/10.1163/9789086866649_021

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Abstract

An ultrasonic transducer was mounted on a vehicle, pointing straight downward to the crop. While the vehicle was moving, the device continuously sent short ultrasonic pulses. After sending each pulse, the sensor sequentially registered the echoes reflected by the individual leaf layers and the ground. Resulting echograms were averaged and stored for later analysis. Measurements were taken in winter wheat trials at multiple times during the 2007 and 2008 growing season. The trial plots comprised different nitrogen levels, varieties and seed densities. Immediately after the measurements, a sample area was harvested from each plot and the dry matter was determined. From the echograms characteristic parameters were extracted and related to the crop biomass. Results show very good relationships between sensor readings and dry matter (r² between 0.79 and 0.94, depending on variety and growth stage). The relationship was not affected by crop density, but by variety. Variety effects correlated with the variety’s typical crop height. Repeated measurements within the growing season showed that the relationship shifts when the canopy architecture changes due to the phenological development of the crop. From the results it is suggested that both the growth stage and the variety should be taken into account if the dry matter has to be predicted from the sensor readings.

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Precision agriculture '09

E-Book ISBN:: 9789086866649

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 2009

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Use of ultrasonic transducers for on-line biomass estimation in winter wheat

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Precision agriculture '09

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