Plant life plays a critical role in the ecosystem. However, it is difficult for humans to perceive plants' reactions because the biopotential and biochemical responses are invisible to humans. Guttation droplets contain various chemicals which can reflect plant physiology and environmental conditions in real-time. Traditionally, these droplets are collected manually and analyzed in the lab with expensive instruments. Here, we introduce the Guttation Monitor, an on-site and low-cost monitoring technology for guttation droplets. It consists of three parts 1) a paper-based microfluidic chip that can collect guttation droplets and perform colorimetric detection of six chemicals, 2) a self-contained and solar-powered camera module that can capture the result from the chip, and 3) an end-user app that can interpret the result. We discuss this technology's design and implementation, conduct evaluations on tomato plants, conduct interviews, and envision how such a technology could enhance the human-plant relationship in four dimensions.

翻译：植物生命在生态系统中扮演着关键角色。然而，由于植物的生物电位和生化反应对人类不可见，人类难以感知植物反应。吐水液滴含有多种化学物质，能够实时反映植物生理状态和环境条件。传统上，这些液滴需人工收集并在实验室中使用昂贵仪器进行分析。本文介绍了一种低成本、可现场应用的吐水液滴监测技术——吐水监测器，它由三部分组成：1）可收集吐水液滴并对六种化学物质进行比色检测的纸基微流控芯片；2）可捕获芯片检测结果的自供能太阳能相机模块；3）可解读结果的终端用户应用程序。我们讨论了该技术的设计与实现，在番茄植株上进行了评估实验，开展了用户访谈，并展望了该技术如何从四个维度增强人-植物关系。