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Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum)

Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum). Pam Turner Oklahoma State University. ‘MassaSonic’ Ultrasonic Sensor. M-5000/95 Conical Beam Angle 8 o Min. Distance 1 ft Max. Distance 13 ft

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Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum)

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  1. Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum) Pam TurnerOklahoma State University

  2. ‘MassaSonic’ Ultrasonic Sensor • M-5000/95 • Conical Beam Angle 8o • Min. Distance 1 ft • Max. Distance 13 ft • Output units 20 mAmps • Operating temp. -20o C to 65o C

  3. Methods Sonar Measurement • Measure and record height from ground to face of sensor • Place sensor over plant. It must be 4 – 40 inches from the plant. • Record reading provided by sensor (mAmps). Fifty readings are taken at each growth stage. • Convert mAmps to inches. • = 3.7809 x Voltage Reading -3.1698 • 5) Value subtracted from sensor height to give plant height.

  4. Methods Hand Measurement • Measure and record the distance between plant and face of sensor. • Using Microsoft Office Excel, subtract height of sensor from hand measured height to get plant height.

  5. Sensor Height: 47.25 in. (120 cm) from ground View Diameter 6.59 cm Growth Stage: 17 Leaf

  6. Sensor Height: 41.5 in. (105.4 cm) from ground View Diameter 5.79 cm Growth Stage: Square Growth Midpoint

  7. Sensor Height: 43 in. (109.2 cm) from ground View Diameter 5.99 cm Growth Stage: White Bloom

  8. Sensor Height: 43 in. (109.2 cm) from ground View Diameter 5.99 cm Growth Stage: Flowering 5-7 Days

  9. Sensor Height: 42.5 in. (107.9 cm) from ground View Diameter 5.92 cm Growth Stage: Developing Boll

  10. Sensor Height: 55 in. (139.7 cm) from ground View Diameter 7.67 cm Growth Stage: Developing Boll

  11. Cotton Sonar Height y = 0.96x + 4.39 R2 = 0.95

  12. Plant Development 2006 Developing Boll Square Growth Midpoint 17 Leaf

  13. Conclusions • Where OSU cotton research is going… • Establish relationship between measuring plants by hand and 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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