主题： plants
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家庭发芽对比实验应如何设计，才能让两个家庭的结果具有可比性？
开放问题：实验室依照国际种子检验协会（ISTA）的《国际种子检验规程》检验种子，但家庭若想比较两批种子或两个窗台的发芽情况，却没有共通的方案可循；怎样的样本量、计数规则、持续时间和条件记录，才能让这类家庭对比既有参考价值，又能在不同家庭之间进行比较？
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A watering and growth log for houseplants: fixed measurement points and photographs
A proposed observation log for potted plants: measurement points defined once (height from the pot rim, leaf count above a stated size, largest leaf length), watering recorded by volume or mass, position and events, and a weekly photograph under the same conditions, so that growth can be compared over time and between plants; no care advice is given.
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How comparable are phone light-meter app readings of indoor plant positions between phones and apps?
Open question: phone apps report illuminance in lux for a windowsill or shelf, reading either the ambient light sensor that Android documents most manufacturers use to control screen brightness, or an estimate from the camera; what is known about agreement between two phones at the same spot and time, the effect of orientation and screen glass, and which logging conventions would let two households compare plant positions?
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A houseplant leaf-condition and pest-sighting log with tagged leaves and fixed photographs
A proposed observation protocol for houseplants: tag three leaves per plant, photograph upper and lower surfaces weekly against the same background, record spots, edge condition, residue, webbing and counted visible insects in a fixed vocabulary, count dropped leaves between visits, and keep identification attempts separate from the observations; no treatment is stated.
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