User manual KONICA SD-PC BROCHURE

[. . . ] By optimizing nutrient conditions, healthier plants can be grown, resulting in a larger crop yield of higher quality. Theory The SPAD-502Plus determines the relative amount of chlorophyll present by measuring the absorbance of the leaf in two wavelength regions. The graph below shows the spectral absorbance of chlorophyll extracted from two leaf samples using 80% acetone. [. . . ] The graph below shows the spectral absorbance of chlorophyll extracted from two leaf samples using 80% acetone. From the diagram, it can be seen that chlorophyll has absorbance peaks in the blue (400-500 nm) and red (600-700 nm) regions, with no absorbance in the near-infrared region. To take advantage of this characteristic of chlorophyll, the SPAD502Plus measures the absorbances of the leaf in the red and near-infrared regions. Using these two absorbances, the meter calculates a numerical SPAD value which is proportional to the amount of chlorophyll present in the leaf. A Checking the nutritional condition of plants The chlorophyll present in the plant leaves is closely related to the nutritional condition of the plant. As can be seen from the graph below, the chlorophyll content (represented by the measured SPAD value) will increase in proportion to the amount of nitrogen (an important plant nutrient) present in the leaf. For a particular plant species, a higher SPAD value indicates a healthier plant. 3. 5 Leaf-blade nitrogen concentration 3. 3 3. 1 2. 9 2. 7 2. 5 2. 3 2. 1 1. 9 1. 7 y =0. 079 x - 0. 154 r =0. 908*** n =68 B Absorbance 1984 1985 24 26 28 30 32 34 36 38 40 42 400 500 600 700(nm) Measured SPAD value Ultraviolet Wavelength Infrared Wheat, Rice, Corn, Cotton and beyond The SPAD-502Plus serves in a wide variety of plant applications. There is increasing awareness of the need for applying the proper amount of N fertilizer in respect to water contamination in both flowing streams and underground water due to nutrient leaching through the field's soil. The SPAD series is playing a significant role in day to day development of N fertilizer application techniques. Rice Cotton Specifications Type Measurement subject Measurement method Measurement area Subject thickness Subject insertion depth Light source Receptor Display Display range Memory function Power source Battery life Minimum interval between measurements Accuracy Repeatability Reproducibility Temperature drift Operating temperature/humidity range Storage temperature/humidity range Size; Weight Other Standard accessories Chlorophyll Meter SPAD-502Plus Crop leaves Optical density difference at 2 wavelengths 2 mm×3 mm 1. 2 mm maximum 12 mm (with stopper having position adjustable from 0 to 6 mm) 2 LED elements 1 SPD (silicon photodiode) LCD panel showing 4-digit measurement value (values shown to first decimal place) and 2-digit number of measurements; Trend graph of values in memory can also be shown. -9. 9 to 199. 9 SPAD units Memory capacity for up to 30 values; Calculation/display of average of data in memory also possible 2 AA-size alkaline batteries More than 20, 000 measurements (when using new alkaline batteries under Konica Minolta test conditions) Approx. 2 seconds Within ±1. 0 SPAD units (for SPAD value between 0. 0 and 50. 0 under normal temperature/humidity) "*" added to display when measurement exceeds 50. 0 SPAD units Within ±0. 3 SPAD units For SPAD value between 0. 0 and 50. 0 (with no change in sample position) Within ±0. 5 SPAD units Within ±0. 04 SPAD units/°C 0 to 50°C; Relative humidity of 85% or less (at 35°C) with no condensation -20 to 55°C; Relative humidity of 85% or less (at 35°C) with no condensation 78 (W) ×164 (H) ×49 (D) mm, 200 g (excluding batteries) Warning buzzer; User compensation factor Depth stop; Strap; 2 AA-size alkaline batteries; Soft case; Reading checker SPAD value: Index value displayed by Konica Minolta Chlorophyll meters and having a correlation to chlorophyll density. Specifications and appearance subject to change without notice. Dimensions (Units: mm) SAFETY PRECAUTIONS For correct use and for your safety, be sure to read the instruction manual before using the instrument. · Be sure to use the specified battery. Using improper battery may cause a fire or electric shock. Registration No. [. . . ] 2 seconds Within ±1. 0 SPAD units (for SPAD value between 0. 0 and 50. 0 under normal temperature/humidity) "*" added to display when measurement exceeds 50. 0 SPAD units Within ±0. 3 SPAD units For SPAD value between 0. 0 and 50. 0 (with no change in sample position) Within ±0. 5 SPAD units Within ±0. 04 SPAD units/°C 0 to 50°C; Relative humidity of 85% or less (at 35°C) with no condensation -20 to 55°C; Relative humidity of 85% or less (at 35°C) with no condensation 78 (W) ×164 (H) ×49 (D) mm, 200 g (excluding batteries) Warning buzzer; User compensation factor Depth stop; Strap; 2 AA-size alkaline batteries; Soft case; Reading checker SPAD value: Index value displayed by Konica Minolta Chlorophyll meters and having a correlation to chlorophyll density. Specifications and appearance subject to change without notice. Dimensions (Units: mm) SAFETY PRECAUTIONS For correct use and for your safety, be sure to read the instruction manual before using the instrument. · Be sure to use the specified battery. [. . . ]