在体玉米穗籽粒水分传感机理及原位无损检测方法研究

The lower moisture content and faster dehydration of corn ear in the field is not only an important index for maize breeding workers to evaluate excellent corn cultivars, but also an important characteristic suitable for mechanical harvesting. In this proposal, we study on a sensing innovation suitable for in-situ determining grain moisture content of corn ear regarded as multilayer medium based on high-frequency electromagnetic field theory. Responses of dielectric property to different moisture content of corn ear under the diverse frequencies will be investigated. Moreover, the project will focus on in-depth analysis the mechanism of corn ears, bract, cobs, conductivity and temperature effects on grain MC detection, then the measurement errors caused by them can be corrected innovatively. Ultimately, we can realize an in-situ, fast, non-destructive, accurate detection of the corn kernels’ MC value without effect of the bracts on intact the corn ear, and provide an innovative method to estimate perfect harvest time for corn, and contribute to rapid breeding of the high dehydration rate type of maize varieties.

田间玉米穗成熟期籽粒脱水快、收获时籽粒含水量较低是玉米育种工作者评价筛选优良品种的重要指标，也是耐密宜机收玉米品种选育的重要特征之一。本课题以高频电磁场理论为基础，以田间成熟期在体玉米穗的籽粒水分含量为研究对象，构建玉米籽粒水分感知机理模型来揭示玉米穗作为多层介质的介电特性。研究不同频率电磁波作用下，不同水分含量的玉米籽粒介电常数的变化规律，深入解析玉米穗苞叶、穗轴、电导率与温度对籽粒水分测量结果的影响机理，提出校正它们所带来的测量误差的创新方法，最终实现原位、快速、无损、准确测定成熟期苞叶存在下在体玉米穗籽粒含水量，为科学地估测玉米收获时间、快速选育高脱水率型的玉米品种提供技术手段。

田间玉米穗成熟期籽粒脱水快、收获时籽粒含水量较低，是玉米育种工作者评价筛选优良品种的重要指标，也是耐密宜机收玉米品种选育的重要特征之一。本课题以高频电磁场理论为基础，以田间成熟期在体玉米穗的籽粒水分含量为研究对象，构建玉米籽粒水分感知机理模型，来揭示玉米穗作为多层介质的介电特性。研究了不同频率电磁波作用下，不同水分含量的玉米籽粒介电常数的变化规律，深入解析玉米穗苞叶、穗轴、电导率与温度对籽粒水分测量结果的影响机理，提出校正它们所带来的测量误差的创新方法，最终实现了原位、快速、无损、准确测定成熟期苞叶存在下在体玉米穗籽粒含水量，可为科学地估测玉米收获时间、快速选育高脱水率型的玉米品种提供技术手段。

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