Need based nitrogen management using the chlorophyll meter and leaf colour chart in rice and wheat in South Asia: a review

Varinderpal-Singh,; Bijay‐Singh,; Yadvinder‐Singh,; Thind, H. S.; Gupta, Rajeev Kumar

doi:10.1007/s10705-010-9363-7

Cited by 119 publications

(34 citation statements)

References 43 publications

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“…Thus, it is probably appropriate to conclude that the SPAD readings provide a reasonable approximation of the total N except at a drought stress (more than 1 500 kPa soil suction head). So, the chlorophyll meter can be used to estimate the real-time based N fertilizer need with the aim to decrease insect pest incidence to plants and, possibly, to reduce gaseous emission of nitrous oxide and harmful effects on the groundwater (Varinderpal-Singh et al, 2010).…”

Section: And Discussionmentioning

confidence: 99%

“…Since plant growth reflects the total N supply from all sources, the plant N status can be considered as an indicator of the soil N availability (Varinderpal-Singh et al, 2010). An easily available instrument, the chlorophyll meter (eg SPAD-502 chlorophyll meter), is used widely to evaluate the plant chlorophyll content and, hence, to estimate the plant N status and deficiencies and, subsequently, to determine the real-time based need for N fertiliser with introducing a proper calibration (Jifon et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Meskini-Vishkaee¹,

Mohammadi²,

Neyshabouri³

et al. 2015

International Agrophysics

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A b s t r a c t. The paper presents a study on the effect of soil matric suction on the variation of leaf chlorophyll index and nitrogen concentration of canola. Results showed that chlorophyll index increases exponentially with soil matric suction, especially at the late season of canola growing time. At moderate matric suction (200 and 300 kPa soil suction heads), chlorophyll index remains nearly constant, but in drier soil (matric suction >300 kPa), chlorophyll index increases gradually with time. Despite the variation of the total leaf nitrogen with the soil matric suction, it is similar to the variation of the chlorophyll index, but the results showed that the chlorophyll index -nitrogen concentration curve has a demarcated bi-modal shape. We suggest that 2.7% of nitrogen and 69.8 of the chlorophyll index value represent the upper limit of the chlorophyll meter reliability for estimation of canola nitrogen under a wide range of soil moisture levels. These results confirm that the chlorophyll meter can be used as an effective tool for rapid and non-destructive estimation of the relative chlorophyll and nitrogen content in canola leaves at a wide range of soil moisture content, except for nearly wilting coefficient or extremely high drought stress.

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Section: And Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Meskini-Vishkaee¹,

Mohammadi²,

Neyshabouri³

et al. 2015

International Agrophysics

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“…According to Jesus & Marenco (2008) and Singh et al (2010), a portable device provides readings or indices that can be related to leaf chlorophyll contents. In addition, the measurements are instantaneous, practical, low-cost and can be performed at the field, which allows the correction of N deficiency in the same crop year.…”

Section: Resultsmentioning

confidence: 99%

Efficiency of portable chlorophyll meters in assessing the nutritional status of wheat plants

Schlichting

Bonfim-Silva

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to verify the efficiency of two portable chlorophyll meters (Minolta SPAD ® 502 and Falker ClorofiLOG ® 1030) in assessing the nutritional status of wheat plants, correlating the indices from the devices and the direct determination of chlorophyll content with the concentration of nitrogen (N) in the plant. The experiment was conducted in a greenhouse, in pots with 5 dm 3 of Oxisol, in a completely randomized design, with six N doses (0, 80, 160, 240, 320 and 400 mg dm Eficiência de medidores portáteis de clorofila na avaliação do estado nutricional de plantas de trigo R E S U M O Objetivou-se, neste trabalho, verificar a eficiência de dois medidores portáteis de clorofila (Minolta SPAD ® 502 e Falker ClorofiLOG ® 1030) na avaliação do estado nutricional de plantas de trigo correlacionando-se os índices dos aparelhos e a determinação direta do teor de clorofila com a concentração de nitrogênio na planta. O experimento foi realizado em casa de vegetação e conduzido em vasos com 5 dm 3 de solo -Latossolo Vermelho distrófico. O delineamento foi inteiramente casualizado, com seis doses de nitrogênio (0, 80, 160, 240, 320 e 400 mg dm -3 ) e cinco repetições. Aos 47 dias após a emergência foram realizadas as leituras dos índices SPAD e Falker, a quantificação do teor de clorofila e a concentração de nitrogênio nas plantas de trigo, além da análise de variância e do teste de correlação, ambos até 5% de probabilidade. Os clorofilômetros Minolta SPAD ® 502 e Falker ClorofiLOG ® 1030 não apresentam diferença entre si na determinação indireta de clorofila nas plantas de trigo. O índice Falker realizou leituras iguais, estatisticamente, do teor de clorofila. Os índices indiretos de clorofila e o teor de clorofila obtiveram alta correlação com a concentração de nitrogênio na planta.

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“…Therefore, knowledge of N status of crop is essential for sustainable management of N fertilizer (Huber and Thompson, 2007). There are several reason mentioned in literature for low N use efficiency, however, the most important reason is an inefficient splitting of N doses coupled with N applications in excess of crop requirements (Varinderpal-Singh et al,2010). Management of N is an important aspect of improving crop productivity.…”

Section: Introductionmentioning

confidence: 99%

Novel Approach for Estimating Nitrogen Content in Paddy Fields Using Low Altitude Remote Sensing System

Saberioon

Gholizadeh

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Commission I, ICWG I/VbKEY WORDS: Low altitude remote sensing, Unmanned aerial vehicle, Rice, Vegetation index, Nitrogen ABSTRACT:Concerns over the use of nitrogen have been increasing due to the high cost of fertilizers and environmental pollutions caused by excess nitrogen application in agricultural fields. Several methods are available to assess the amount of nitrogen in crops, however, they are expensive, time-consuming, inaccurate, and/or require specialists to operate the tools. Researcher recently suggested remote sensing and specifically Low Altitude Remote Sensing (LARS) system of chlorophyll content in crop canopies as a low-cost alternative to estimate plant nitrogen status. The main objective of this study was to develop and test a new Vegetation Index (VI) to determine the status of nitrogen and chlorophyll content in rice leaf by analysing and considering all Visible (Vis) bands. Besides, capability of introduced VI has compared with all known VIs in both Vis and Near Infrared (NIR) bands in canopy scale. To develop the VI, images from 6-pannel leaf colour chart were acquired using Basler Scout scA640-70fc under light-emitting diode lighting, in which principal component analysis was used to retain the lower order principal component to develop a new index called I PCA . A conventional digital camera mounted to an Unmanned Aerial Vehicle (UAV) was also used to acquire images over the rice canopy in Vis bands. Simultaneously, Tetracam agriculture digital camera was employed to acquire rice canopy image in Vis-NIR bands. The results indicated that the proposed index at canopy (r = 0.78) scale could be used as a sensor to determine the status of chlorophyll content consequently for monitoring nitrogen in rice plant through different growth stages. Moreover, results confirmed that a lowcost LARS system would be suited for high spatial and temporal resolution images and data analysis for proper assessment of key nutrients in crop farming in a fast, inexpensive and non-destructive way.

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Need based nitrogen management using the chlorophyll meter and leaf colour chart in rice and wheat in South Asia: a review

Cited by 119 publications

References 43 publications

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

Efficiency of portable chlorophyll meters in assessing the nutritional status of wheat plants

Novel Approach for Estimating Nitrogen Content in Paddy Fields Using Low Altitude Remote Sensing System

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