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针对测土配方施肥技术中要求快速、便捷、高效地进行土壤养分测试的需求,文章基于浸入式光纤探头、平场凹面全息光栅、二极管线阵检测器开发了一种光纤探头式分光光度计用于土壤养分中非金属元素的快速、准确测试。基于国家计量检定规程JJG 178—2007对紫外、可见、近红外分光光度计的性能检测方法测试的该仪器的波长最大允许误差与波长重复性、基线平直度、透射比最大允许误差与透射比重复性均达到了国标第Ⅲ级别标准,其最小光谱带宽、噪声与漂移、杂散光基本达到了国标第Ⅳ级别标准。基于该仪器测试的土壤硝态氮、铵态氮、有效磷、有效硫、有效硼、和有机质含量与基于商用的国产单光束和进口双光束分光光度计测试的结果呈极显著的线性相关关系,其回归方程的斜率接近于1,且对比数据之间无显著性差异。因此,该光纤探头式分光光度计可用于土壤非金属养分的快速、准确测试。
In order to meet the need of fast, convenient and efficient soil nutrient testing in soil testing and fertilization technology, a fiber optic probe spectrophotometer was developed based on immersion fiber probe, flat-field concave holographic grating and diode linear array detector Rapid and accurate testing of non-metallic elements in soil nutrients. Based on the national measurement test procedures JJG 178-2007 UV, visible, near-infrared spectrophotometer performance testing method of testing the instrument maximum allowable wavelength error and wavelength repeatability, the baseline straightness, the maximum allowable transmission of transmittance and transmittance Repeatability reached the national standard Ⅲ level standards, the minimum spectral bandwidth, noise and drift, stray light basically reached the national standard Ⅳ level. The soil nitrate, ammonium, available phosphorus, available sulfur, available boron, and organic matter based on this instrumental test showed a significantly significant linear correlation with the results of commercial single-beam and imported dual-beam spectrophotometer tests , The slope of the regression equation is close to 1, and no significant difference between the comparative data. Therefore, the fiber optic probe spectrophotometer can be used for fast and accurate soil non-metallic nutrients testing.