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Journal of Sensors
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2019
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Article
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Fig 4
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Research Article
A Preliminary Study of Seeding Absence Detection Method for Drills on the Soil Surface of Cropland Based on Ultrasonic Wave without Soil Disturbance
Figure 4
Three cases of seeding absence: (a)
,
(b)
,
and (c)
.
(a)
(b)
(c)