Abstract：A portable meter was developed which can detect chlorophyll, nitrogen and moisture content of wheat leaf simultaneously, and can supply enough data for guiding fertilization and irrigation. This meter is composed of light path and electronic circuit. And this meter uses 660, 940 and 1 450 nm LED together with narrow band filters as the active light source. The hardware circuit consists of micro-controller, LED drive circuit, detector, communication circuit, keyboard and LCD circuit. The meter was tested in the field and performed well with good repeatability and accuracy. The relative errors of chlorophyll and nitrogen test were about 10%, relative error for water content was 4 %. The coefficients of variation of the three indices were all below 1.5%. All of these prove that the meter can be applied under the field condition to guide the wheat production.
Key words：Wheat;Chlorophyll;Nitrogen;Moisture content;portable meter
于 渤，孙 明*，韩书庆，夏锦闻. 小麦叶绿素、氮素、水分一体化测定仪的开发与测试[J]. 光谱学与光谱分析, 2011, 31(08): 2294-2297.
YU Bo, SUN Ming*, HAN Shu-qing, XIA Jin-wen. Development and Test of a Wheat Chlorophyll, Nitrogen and Water Content Meter. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(08): 2294-2297.
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