The reflectometer consists of a multi-wavelength light source, a multi-channel optical path, a test strip holder, and a reflective plate.
Reflectometer
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Reflectometer by multi-wavelength light source, multi-channel
Reflector developed by Henan Agricultural University
The stability instrument has five consecutive air scans, and the calibration value of the three wavelengths does not change by more than 1%.
Sensitivity 0.01 ± 0.001
Linear error instrument measurement linear error is not greater than 10%
Measurement repeatability error RSD is not greater than 3%
Applicable test strip width 5 ± 0.2mm
Linear range of nitrate 10-50 micrograms / ml; nitrite 4-30 micrograms / ml
Relative standard deviation of the test: less than 3%
Quantitative test time of test strip (excluding sample preparation time) 1min
2. Sampling of nitrate nitrogen for crops and its index of abundance (conventional)
crop name | Cultivate condition | Sampling site | sampling time | Crop NO3-N level (g / mL) |
low | in | high | Over |
small wheat | field between | Leaf sheath | Jointing stage | 100 | 250 | 500 | > 750 |
Leaf sheath | Pre-winter tillering | <200 | 300-400 | 500 | |
Leaf sheath | Greening period | <200 | 200-300 | | |
Leaf sheath | Flowering period | <100 | 100 | | |
jade Meter | field between | Lower half of leaf sheath | Seedling stage | 100 | 300-500 | | |
Lower half of leaf sheath | Jointing stage | 300 | 500 | 500-600 | |
Midvein | Flowering period | 100 | 300-500 | 800-1000 | |
cotton flower | field between | Apical third leaf petiole | Bud period | | 500-800 | 500-600 | |
Apical third leaf petiole | Flower knot bell period | | 100-200 | | |
Apical third leaf petiole | Late flowering | | > 100 | | |
Apical third leaf petiole | Flower bell period | <100 | 200-300 | | > 300 |
sweet potato | field | Top sixth leaf | Early growth | 1500 | 2500 | 3500 | |
