Indirect Measurement of Plant Height in Cotton Gossypium
- Slides: 13
Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum) Pam Turner Oklahoma State University
‘Massa. Sonic’ Ultrasonic Sensor • M-5000/95 • Conical Beam Angle 8 o • Min. Distance 1 ft • Max. Distance 13 ft • Output units • Operating temp. 20 m. Amps -20 o C to 65 o C
Methods Sonar Measurement 1) Measure and record height from ground to face of sensor 2) Place sensor over plant. It must be 4 – 40 inches from the plant. 3) Record reading provided by sensor (m. Amps). Fifty readings are taken at each growth stage. 4) Convert m. Amps to inches. 5) = 3. 7809 x Voltage Reading 3. 1698 6) 5) Value subtracted from sensor height to give plant height.
Methods Hand Measurement 1) Measure and record the distance between plant and face of sensor. 2) Using Microsoft Office Excel, subtract height of sensor from hand measured height to get plant height.
Sensor Height: 47. 25 in. (120 cm) from ground View Diameter 6. 59 cm Growth Stage: 17 Leaf
Sensor Height: 41. 5 in. (105. 4 cm) from ground View Diameter 5. 79 cm Growth Stage: Square Growth Midpoint
Sensor Height: 43 in. (109. 2 cm) from ground View Diameter 5. 99 cm Growth Stage: White Bloom
Sensor Height: 43 in. (109. 2 cm) from ground View Diameter 5. 99 cm Growth Stage: Flowering 5 -7 Days
Sensor Height: 42. 5 in. (107. 9 cm) from ground View Diameter 5. 92 cm Growth Stage: Developing Boll
Sensor Height: 55 in. (139. 7 cm) from ground View Diameter 7. 67 cm Growth Stage: Developing Boll
Cotton Sonar Height y = 0. 96 x + 4. 39 R 2 = 0. 95
Plant Development 2006 Developing Boll 17 Leaf Square Growth Midpoint
Conclusions Where OSU cotton research is going… • Establish relationship between measuring plants by hand measuring plants with ultrasonic sensor • Develop a benchmark setting for cotton to look at plant or target biomass NDVI • Establish a method for yield prediction
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- Ulnar measurement for height
- Exp height
- 60m height comparison
- Peer review process cmmi
- Profile projector
- Direct type level measurement method
- Direct method of measurement
- Indirect measurement using similar triangles
- Linear measurement instruments in surveying
- Similar figures and indirect measurement
- Indirect measurement methods