What Is a Reflectometer?

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