张淼,潘林沛,阳清亮,郑杰,陈铭,汪懋华.基于斜率-截距校正算法的番茄营养液ISE监测[J].农业机械学报,2018,49(5):342-347.
ZHANG Miao,PAN Linpei,YANG Qingliang,ZHENG Jie,CHEN Ming,WANG Maohua.ISE Monitoring of Macronutrients in Hydroponic Tomato Cultivation Based on Slope and Bias Correction Method[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(5):342-347.
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基于斜率-截距校正算法的番茄营养液ISE监测   [下载全文]
ISE Monitoring of Macronutrients in Hydroponic Tomato Cultivation Based on Slope and Bias Correction Method   [Download Pdf][in English]
投稿时间:2017-11-10  
DOI:10.6041/j.issn.1000-1298.2018.05.040
中文关键词:  番茄  离子选择电极  斜率-截距校正  监测  无土栽培
基金项目:国家重点研发计划项目(2016YFD07003-2016YFD0700304、2016YFD0800900-2016YFD0800907)、云南省汪懋华院士工作站项目(2015IC016)和中央高校基本科研业务费专项资金项目(2017XD002)
作者单位
张淼 中国农业大学 
潘林沛 中国农业大学 
阳清亮 中国农业大学 
郑杰 中国农业大学 
陈铭 中国农业大学 
汪懋华 中国农业大学 
中文摘要:利用斜率-截距校正算法(SBC)解决离子选择电极连续在线测量电势漂移问题,结合Nernst线性模型预测无土栽培番茄苗期至果期营养液NO3N、K+、Ca2+含量变化。结果表明:SBC校正算法可有效减少离子选择电极(ISE)电势漂移,提高线性预测模型重复性,校正后ISE响应斜率漂移范围不超过0.4mV/decade,截距漂移范围可控制在1mV以内。SBC校正算法可提高Nernst线性模型预测精度,NO3N、K+、Ca2+含量预测平均相对误差分别从校正前的43.31%、38.46%、93.83%降至校正后的5.99%、7.44%、27.96%。校正后ISE可实现番茄营养液在线连续监测,反映营养液中目标离子含量变化。番茄花期养分吸收较活跃,NO3N、K+、Ca2+含量分别下降45.19%、36.46%和27.92%。
ZHANG Miao  PAN Linpei  YANG Qingliang  ZHENG Jie  CHEN Ming  WANG Maohua
China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University and China Agricultural University
Key Words:tomato  ion-selective electrode  slope and bias correction  monitoring  hydroponic cultivation
Abstract:Monitoring macronutrients in hydroponic nutrient solution is a vital task for tomato growth. Ion selective electrodes (ISEs) were used to detect the NO3N, K+, Ca2+ concentrations. The slope and bias correction (SBC) method was applied to alleviate the signal drift of ISEs due to continuous immersion in nutrient solutions. The slopes of response Nernst equation for NO-3, K+, Ca2+ ISEs were decreased to 0.05, 0.39 and 0.04, and intercept potentials were reduced to 0.12mV, 0.93mV and 0.10mV, respectively. It indicted the capacity of slope and bias correction method as improving the repeatability and consistency of each ISE’s Nernst equation. Then the NO3N, K+ and Ca2+ concentrations were predicted by Nernst model, and they were measured by spectrographic method to provide standard values. The predicted accuracy of NO3N, K+, Ca2+ concentrations was improved after using slope and bias correction method, providing by the relative errors were significantly reduced from 43.31%, 38.46% and 93.83% to 5.99%, 7.44% and 27.96%,respectively. It was obvious that the results obtained from ISEs coupled with slope and bias correction method could indeed reflect the macronutrients component in tomato nutrient solutions. The assimilation of macronutrients was activated in flower stage, with the decrease of 45.19%, 36.46% and 27.92% for NO3N, K+ and Ca2+ concentrations, respectively.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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