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Crop Spec, A Collaborative Partnership

A real time integrated plant nutrient monitoring and application system for Agricultural equipment. Crop Spec, A Collaborative Partnership. Yara Electronic Products ,1995 - Present. CropSpec TM – specifications. Sensor Footprint – Oblique View.

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Crop Spec, A Collaborative Partnership

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  1. A real time integrated plant nutrient monitoring and application system for Agricultural equipment Crop Spec, A Collaborative Partnership

  2. Yara Electronic Products ,1995 - Present

  3. CropSpecTM – specifications

  4. Sensor Footprint – Oblique View

  5. Impact of different N supply on the reflectance spectra of winter wheat Reflectance 0,6 N Supply Increase due to increased biomass 200 kg/ha 0,5 120 kg/ha 0,4 60 kg/ha 0,3 N response trail, 1994 0,2 Decrease due to increased chlorophyll content 0,1 IR 0 450 500 550 600 650 700 750 800 850 Wavelength, nm IR • N status of crops can be measured by analysing reflectance spectral data => non-destructive, non-contacting

  6. Waveband to Chlorophyll relationship The basis for getting meaningful crop information • accurate measurements in various crops andover a wide range of crop densities • based on know-how and extensive field trial work by Yara • 730-740 nm & 760-810 nm Source: Reusch, 2005

  7. Crop Spec System Diagram for X20 RS232 CANBUS Topcon X20 Implement with Liquid or GranularApplication Supports all X20 application controllers

  8. CropSpec Parameter Calculation Define: R = Simple ratio of NIR reflectance (808nm) to RedEdge (735nm) R = NIR/ RedEdge Define: S1 = 100 * (R – 1) Compare NDVI = (R - 1) / (R + 1) The CropSpec parameter is defined: S1CAL = 47 * S1 / S1REF S1REF is the S1 measured with the reference matching filter. The 47 factor is used for matching with YARA.

  9. X20 CropSpec User Interface – Maplink CropSpec (S1CAL) Histogram

  10. CropSpec OTG Application Models Negative slope factor also available

  11. OTG Two Point Cal – Strip method Drive Strip and Apply at Normal Rate Select min and max CropSpec from cutoff line Associate two rates => slope factor Select two point or target rate mode

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