Evaluation of the chlorophyll meter and GreenSeeker for the assessment of rice nitrogen status

Zhang, Ke; Ge, Xiaokang; Liu, Xia; Zhang, Ze-Yu; Liang, Yan; Tian, Yongchao; Cao, Qiang; Cao, Weixing; Zhu, Yan; Liu, Xiaojun

doi:10.1017/s2040470017000917

Cited by 20 publications

(13 citation statements)

References 10 publications

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“…Japonica rice is the main rice variety type in Jiangsu, China. Jiangsu also has the highest average rice grain yield in China [30,31]. The present study was carried out in two typical japonica rice-producing areas in the Jiangsu Province, including the lower reaches of the Yangtze River (Rugao) and Huaihe River Basin (Huai'an and Sihong) in Northern Jiangsu.…”

Section: Experimental Designmentioning

confidence: 99%

A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters

Zhang

Liu

et al. 2019

Sensors

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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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Section: Experimental Designmentioning

confidence: 99%

A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters

Zhang

Liu

et al. 2019

Sensors

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“…In studies where nitrogen fertilization has been applied, it has been found that NDVI value and chlorophyll content increases with fertilization. The reason for this is that the presence of nitrogen in the soil and chlorophyll in plants are directly related (Jones et al, 2007;Zhang et al, 2017). It has been reported that there is no correlation between NDVI values and chlorophyll amounts (Hernandez et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Investigation of Salt Stress in Rosemary (Rosmarinus officinalis L.) with the Remote Sensing Technique

Atun

Sözmen

Gürsoy

2020

Türkiye Tarımsal Araştırmalar Dergisi

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In the present work, the effect of different salt concentrations on growth and quality of rosemary (Rosmarinus officinalis L.) was investigated using ground-based remote sensing techniques under greenhouse conditions in 2018. The experiment was carried out in a randomized complete block design with three replications and lasted 8 weeks in total. Spectroradiometer measurements were performed on the leaves of rosemary plants to monitor changes in spectral signatures due to salt stress. Spectrophotometer and chlorophyll meter measurements were also taken from the leaves of the plants to investigate the reactions to salt stress at the end of 4 th and 8 th weeks simultaneously with all other measurements. According to the obtained data, there was a significant difference in the chlorophyll, brightness and colour values of the leaves in response to salt stress, and a difference was observed in the reflective values of the plants in the spectral measurements taken at 4 th and 8 th weeks. The region with the biggest difference between reflectance values was near-infrared among different salt concentrations applied plants. In the 4 th week, the most vivid color (intense green) was obtained in the S3 and S4 applications, (19.80 and 19.40, respectively). However, as the stress application time and the applied salt rate increased, small changes in plant color occurred. Besides, it was concluded that salt treatment increased the NDVI (Normalized Difference Vegetation Index) values of the plants.

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“…The multiple or dynamic critical SPAD thresholds could lead to confusion among farmers, which would restrict the widespread application of SPAD‐values‐based SSNM regulation strategy. Moreover, SPAD readings are affected by factors such as irradiance, leaf thickness, growth stage, and genotype (Martínez & Guiamet, , Peng et al., ; Zhang et al., ), which posed a great challenge for the reliability of the SPAD‐values‐based SSNM method. In contrast, normalized SPAD readings are more reliable than the absolute SPAD readings, mainly because the former can overcome the negative influence of year, eco‐site, cultivar, growing stages, etc.…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll meter–based nitrogen fertilizer optimization algorithm and nitrogen nutrition index for in‐season fertilization of paddy rice

et al. 2020

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Nitrogen fertilizer optimization algorithm (NFOA) and nitrogen nutrition index (NNI) have been developed to achieve higher yield and N use efficiency. This study was to improve NFOA and NNI strategies for managing rice N nutrition based on portable Soil and Plant Analyzer Development (SPAD) meter. Four field experiments were conducted in 2013–2014 to generate diverse N fertilizer rates in rice cultivars at three eco‐sites. Nitrogen indicators SPAD readings were measured to establish SPAD‐based management strategies. Two experiments were conducted to assess the effectiveness of developed NFOA and NNI algorithm for upward and downward adjustment of N‐fertilizer doses twice within the growing season in 2015. New N‐adjustment strategies optimized N topdressing by upward‐, fine‐, and downward‐ adjustment with an average N‐application rate of 264–272 kg N ha−1 in eastern China. Maximum grain yield (10.5 t ha−1) was obtained when 264 kg N ha−1 was applied. The recovery efficiency of N fertilizer was higher for NFOA and NNI (51–57%) than fixed‐time application of 270 kg N ha−1 (48%). The comparable high net profit (>$1080 ha−1) was achieved with lower N‐adjustment fertilizer input in 270 and 360 kg N ha−1 treatments. SPAD‐based NFOA and NNI methods are practical approaches for reducing excessive use of N fertilizer, achieving slight increase in yield, and net profit was decreased (360 kg N ha−1). More refinements are necessary to ensure that these strategies can be used for yield‐ and income‐enhancing production for farmers.

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Evaluation of the chlorophyll meter and GreenSeeker for the assessment of rice nitrogen status

Cited by 20 publications

References 10 publications

A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters

A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters

Investigation of Salt Stress in Rosemary (Rosmarinus officinalis L.) with the Remote Sensing Technique

Chlorophyll meter–based nitrogen fertilizer optimization algorithm and nitrogen nutrition index for in‐season fertilization of paddy rice

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