2010
DOI: 10.1016/j.fcr.2010.05.011
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Estimating the nitrogen status of crops using a digital camera

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Cited by 166 publications
(147 citation statements)
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“…Different types of sensors have been used and correlated with N stress in maize (Li et al 2010). Remote sensing of crop canopies has predominantly used optical reflectance in the visible and NIR bands.…”
Section: Introductionmentioning
confidence: 99%
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“…Different types of sensors have been used and correlated with N stress in maize (Li et al 2010). Remote sensing of crop canopies has predominantly used optical reflectance in the visible and NIR bands.…”
Section: Introductionmentioning
confidence: 99%
“…Passive sensors rely on the sun to illuminate the maize canopy, while active sensors use an internal light source. Each type of sensor has been documented as an appropriate way to correlate canopy reflectance with chlorophyll and N status of maize (Samborski et al 2009;Li et al 2010). Passive sensors require calibration and data handling techniques to account for sun angle, illumination, camera optics, rectification of imagery, and require specialized software to analyze the imagery (Berni et al 2009).…”
Section: Introductionmentioning
confidence: 99%
“…La reflectancia espectral de un cultivo se correlaciona con el crecimiento alcanzado y la biomasa producida (Li et al, 2010), y ha demostrado potencial también a los efectos de proporcionar información sobre el contenido de N de la vegetación (Raun et al, 2008).…”
Section: Introductionunclassified
“…El NGRDI tampoco mostró diferencias en el estado de N de un experimento de fertilización en maíz, aunque las áreas de bajo contenido en N fueron evidentes en fotografías digitales al final del ciclo. Li et al (2010) emplearon datos de reflectancia espectral en el rango visible (v y r) para elaborar indicadores de estimación de la cobertura del follaje en trigo, y establecieron que estos valores estuvieron estrechamente correlacionados con los valores de NDVI obtenidos a partir de los dispositivos comerciales GreenSeeker® y Yara N-Sensor. Estos últimos utilizan la reflectancia del rojo e infrarrojo cercano de la cubierta del cultivo.…”
Section: Introductionunclassified
“…Recently, Rorie et al [10] use an internal calibration disk with a known surface reflectance as a reference for correcting the differences found in a camera's light sensitivity and crop's lighting conditions. Li et al [11] and Wang et al [12] used canopy cover (CC), calculated by digital images using an image analysis program, was highly correlated with growth and N nutrition parameters such as leaf area index LAI, shoot dry weight, and shoot N accumulation. Lee et al [13] also found that digital camera could be employed for characterizing the growth and N nutrition status of rice.…”
Section: Introductionmentioning
confidence: 99%