PSI N-Pen N 100 PSI N-Pen N 100 PSI N-Pen N 100
PSI N-Pen N 100 PSI N-Pen N 100 PSI N-Pen N 100

N-Pen N 110

N-Pen is a light-weight, battery-powered reflectance-based instrument that provides a convenient, cost-effective method for effective nitrogen management in plants throughout their growing season. Essentially, the N-Pen characterises nitrogen amount by means of reflectance and by the concept of a close link between chlorophyll content and nitrogen content in plants.
Crops | Photosynthesis, Chlorophyll & Respiration | Photon Systems Instruments (PSI)

N-Pen Measures:

  • N-Pen measures actual nitrogen content using the Normalised Difference Greenness Index NDGI
  • Nitrogen reading is calibrated for particular plant (wheat, barley or maize) and is displayed as %
  • Variety or hybrid differences can greatly affect N-Pen readings
  • Plant diseases, nutrient deficiencies and other kinds of plant stress can also affect N-Pen readings

N-Pen Sampling:

  • Difference Greenness Index NDGI
  • Nitrogen reading is calibrated for particular plant (wheat, barley or maize) and is displayed as %
  • Variety or hybrid differences can greatly affect N-Pen readings
  • Plant diseases, nutrient deficiencies and other kinds of plant stress can also affect N-Pen readings
  • Simply insert the leaf between the leaf clip and the optical tip
  • N-Pen collects and stores individual readings and calculates the average automatically
  • Readings should be taken on different plants of the same species
  • Readings should be taken on the 2nd (maximum 3rd) youngest leaf on each plant
  • Readings should be taken on about the same location on each leaf (close to the mid part)
Measured Parameters Nitrogen content calibrated for particular plant
Measuring Light Dual wavelength light source – 565 nm, 760 nm
Optical Aperture Diameter 5 mm
Detector Wavelength Range 500 to 800 nm bandpass filters
Memory Capacity Up to 16 Mb
Display 2 x 8 characters LCD
Power Supply 4 AAA alkaline or rechargeable batteries