A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters
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National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China
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Key Laboratory for Crop System Analysis and Decision Making, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, China
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Jiangsu Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China
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Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing 210095, China
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College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
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Author to whom correspondence should be addressed.
Sensors 2020, 20(1), 175; https://doi.org/10.3390/s20010175
Received: 22 November 2019
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Revised: 22 December 2019
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Accepted: 24 December 2019
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Published: 27 December 2019
(This article belongs to the Special Issue Advanced Sensors in Agriculture)
Accurate estimation and monitoring of crop nitrogen can assist in timely diagnosis and facilitate necessary technical support for fertilizer management. Four experiments, involving three cultivars and six nitrogen (N) treatments, were conducted in southeast China to compare the two leaf-clip meters (Dualex 4 Scientific+, Force-A, Orasy, France; Soil and Plant Analyzer Development (SPAD) meter, Minolta Camera Co., Osaka, Japan) for their ability to measure nitrogen nutrient-related indicators. The results indicated that Chl had a better monitoring accuracy for chlorophyll in per unit leaf area as compared to SPAD value, and there was no saturation to appear under high leaf chlorophyll concentration status. Flavonoids (Flav) presented the advantage of early diagnosis of rice N nutrition status (about one day as compared to SPAD value). As a reliable N nutrient diagnosis indicator, it also improved the estimation accuracy compared with the classical SPAD-based method. The other Dualex value also obtained good monitoring results. Flav was positively correlated with N deficiency, and with higher R2 in panicle initiation and booting stages with low RMSE, respectively; whereas SPAD value was negatively correlated with nitrogen deficiency. Therefore, the Flav-based nitrogen application model was found to provide an early rice nitrogen fertilizer application approach, especially in the panicle initiation and booting stages.
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MDPI and ACS Style
Zhang, K.; Liu, X.; Ma, Y.; Zhang, R.; Cao, Q.; Zhu, Y.; Cao, W.; Tian, Y. A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters. Sensors 2020, 20, 175. https://doi.org/10.3390/s20010175
AMA Style
Zhang K, Liu X, Ma Y, Zhang R, Cao Q, Zhu Y, Cao W, Tian Y. A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters. Sensors. 2020; 20(1):175. https://doi.org/10.3390/s20010175
Chicago/Turabian StyleZhang, Ke, Xiaojun Liu, Yong Ma, Rui Zhang, Qiang Cao, Yan Zhu, Weixing Cao, and Yongchao Tian. 2020. "A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters" Sensors 20, no. 1: 175. https://doi.org/10.3390/s20010175
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