Data from a study of the dependence of chlorophyll fluorescence induction on soil moisture level

CFI - chrorophyll fluorescence induction The experiment included zinnia plants, which were planted in pots and divided into four groups. The first group (V1) was irrigated with water at the rate of 100 ml/kg of soil, the second (V2) – 300 ml/kg of soil, the third group (V3) – without irrigation, the fourth group – 500 ml/kg (V4). The watering was performed every day. Before the start of the experiment, all plants were watered equally. At the end of the experiment, some of the plants died, so very few measurements were made in three groups (V3) in the last days of the experiment. The measurements of CFI took place over two weeks in laboratory conditions (a total of 9 measurement series). At the same time, the temperature in the laboratory was maintained within 22-26°C. An hour before the measurement, the plants were placed in the shade, which allowed reducing the dark adaptation time of the plants before measuring the CFI from 15 min to 4 min. The CFI was measured using four CFI sensors developed at the V.M. Glushkov Institute of Cybernetics of the National Academy of Sciences of Ukraine. The sensors measured the change in CFI over a period of 5 minutes. The soil temperature, pH, and moisture were measured using a KC-300 soil analyzer. Categorical soil moisture values obtained using the device were converted into digital values by replacing the categorical values with the corresponding digital designations (from 1 to 5). The soil parameters in each pot with plants were measured three times in random locations. The obtained values were averaged. Additionally, the temperature and humidity of the air were measured during each measurement of the CFI curve.叶绿素荧光诱导（Chlorophyll Fluorescence Induction, CFI） 本实验以百日草盆栽植株为研究对象，将其分为四组开展灌溉处理。第一组（V1）以每千克土壤100ml的剂量灌溉清水，第二组（V2）为300ml/kg土壤，第三组（V3）不进行灌溉，第四组（V4）为500ml/kg土壤。灌溉操作每日进行一次，实验开始前所有植株均接受等量灌溉。实验末期有部分植株死亡，因此在实验最后几日，V3组仅能开展极少次数的测量。 CFI测量工作在实验室条件下开展，总周期为两周，共计完成9次测量序列。实验期间实验室温度维持在22~26℃范围内。测量前1小时将植株置于阴凉处，可将CFI测量前的植株暗适应时间从15分钟缩短至4分钟。 CFI测量采用乌克兰国家科学院弗拉基米尔·M. 格鲁什科夫控制论研究所研发的4台CFI传感器，该传感器可记录5分钟时长内的CFI动态变化。土壤温度、pH值与湿度采用KC-300土壤分析仪进行测量，将设备获取的分类土壤湿度值替换为对应的数字标识（1至5），以转换为可量化的数字数值。每盆植株的土壤参数需在随机布设的点位开展3次测量后取平均值。每次CFI曲线测量期间，还会同步测量空气温湿度。